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auto increment in sql oracle - ( Auto increment field )
 
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auto increment in sql oracle ----------------------------------------------- CREATE table customers ( customer_id int not null, customer_name varchar(50), primary key (customer_id) ); create sequence customer_id minvalue 1 start with 1 cache 10; insert into customers values(customer_id.nextval,'maxwel'); -- to drop sequence drop sequence customer_id
Views: 7270 Data Disc
Oracle SQL Tutorial : How to create Id with AUTO INCREMENT in Oracle PL SQL
 
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Oracle SQL Tutorial Oracle tutorial: How to create Id with AUTO INCREMENT in Oracle oracle tutorial for beginners sequence in oracle identity key in sql In this Oracle tutorial , we can create an auto increment field using ‘sequence’ object that can be assigned as primary keys. Using Oracle ‘sequence’ object, you can generate new values for a column. An Oracle sequence is an object like a table or a stored procedure. Examples CREATE SEQUENCE SYSTEM.MYSEQ START WITH 1 MAXVALUE 999999999999999999999999999 MINVALUE 1 NOCYCLE CACHE 20 NOORDER; CREATE OR REPLACE TRIGGER TR_CITY BEFORE INSERT ON CITY FOR EACH ROW BEGIN SELECT LPAD(LTRIM(RTRIM(TO_CHAR(myseq.NEXTVAL))),10,'0') INTO :NEW.id FROM DUAL; END; / Subscribe on youtube: https://www.youtube.com/channel/UCpiyAesWNYOXSz5GPq8lbkA For more tutorial please visit #techquerypond https://techquerypond.wordpress.com https://twitter.com/techquerypond identity column
Views: 10105 Tech Query Pond
Create Oracle SQL database with auto-incrementing integers for the primary key
 
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Create a new Oracle SQL database using SQL. After the database is created, I demonstrate using an Oracle SQL sequence and trigger to create auto-incrementing integers which are used as the table's primary key.
Views: 12162 Mike Colbert
create auto-increment Id for table in oracle database
 
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create auto-increment Id for table in oracle database
Views: 21568 Ahmad Naser
50. AUTO INCREMENT in SQL (Hindi)
 
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Views: 15072 Geeky Shows
how to create database ,table  with primary key and auto increment in phpmyadmin
 
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This video explain how to create database and table and primary and auto increment in phpmyadmin
Views: 57456 expert programming
SQL tutorial 61: SEQUENCE in Oracle Database By Manish Sharma RebellionRider
 
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This tutorial is all about Sequence In Oracle Database. In this SQL Tutorial you will learn How to create a sequence How to populate a Primary key column (auto increment in Oracle) using Sequence How to drop a sequence ------------------------------------------------------------------------ ►►►LINKS◄◄◄ Blog : http://bit.ly/sql-sequence-in-oracle-database-rebellionrider-manish-sharma Previous Tutorial ► How To Insert Data into Table using SQL Developer http://youtu.be/YYQCSV6MzTk ► INSERT INTO Command http://youtu.be/uQXgqFtxI_k ► How to copy /Insert data into a table from another table http://youtu.be/m3Ep8tAMqok ------------------------------------------------------------------------- ►►►Help Me In Getting A Job◄◄◄ ►Help Me In Getting A Good Job By Connecting With Me on My LinkedIn and Endorsing My Skills. All My Contact Info is Down Below. You Can Also Refer Me To Your Company Thanks ------------------------------------------------------------------------- Copy Cloud referral link || Use this link to join copy cloud and get 20GB of free storage https://copy.com?r=kb4rc1 -------------------------------------------------------------------------- ►Make sure you SUBSCRIBE and be the 1st one to see my videos! -------------------------------------------------------------------------- Amazon Wishlist: http://bit.ly/wishlist-amazon ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ►►►Find me on Social Media◄◄◄ Follow What I am up to as it happens on https://twitter.com/rebellionrider https://www.facebook.com/imthebhardwaj http://instagram.com/rebellionrider https://plus.google.com/+Rebellionrider http://in.linkedin.com/in/mannbhardwaj/ http://rebellionrider.tumblr.com/ http://www.pinterest.com/rebellionrider/ You can also Email me at for E-mail address please check About section Please please LIKE and SHARE my videos it makes me happy. Thanks for liking, commenting, sharing and watching more of our videos This is Manish from RebellionRider.com ♥ I LOVE ALL MY VIEWERS AND SUBSCRIBERS
Views: 44250 Manish Sharma
MySQL 15 - Auto Increment (AUTO_INCREMENT)
 
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If you are using surrogate keys, every row is going to need to have a unique value for this column. The easiest way to do this is to just count upwards. The downside is that every time you insert data you are going to have to know what number to use. Fortunately, there is an easier way, with what is known as an AUTO_INCREMENT column. An AUTO_INCREMENT column is a column in a table that automatically counts upwards. If we set the PK column as an AUTO_INCREMENT column, we do not have to worry about keeping track of the numbers we've already used. Now, you can only have one AUTO_INCREMENT column per table, and you can only have one primary key per table. AUTO_INCREMENT has to be used on a primary key or a unique index. It makes sense to make the primary key column the AUTO_INCREMENT column, but you can create any other column as the AUTO_INCREMENT column as long as it has a UNIQUE index. So, for example, if you wanted to use a natural primary key but wanted to have a column that auto increments, you could do that by making the incrementing column UNIQUE. Now, the AUTO_INCREMENT does not force the data to never change. It is important to understand that the concept of surrogate and natural keys is foreign to the database. The database does not care what kind of key you use, as long as the qualifications are met. There are no keywords that say surrogate. There are no keywords that say natural. These are categories that we've made to help us better communicate about primary keys. An interesting thing you can do with primary keys is that you can make a combination of columns the primary key. This is important when more than one column is required to make something unique. In an intermediary table, instead of having an association ID, we can have the combination of two rows as the primary key. This is known as either a compound or composite primary key. In the situation of using natural keys, composite keys are more common. For example, you could have a shopping website that allows multiple people from the same household to use a certain coupon you sent out. In this situation, you could use the address and the person's name as the natural primary key. How do we reference primary keys? This requires what is known as a foreign key, which we will discuss in the next video. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Support me! http://www.patreon.com/calebcurry Subscribe to my newsletter: http://bit.ly/JoinCCNewsletter Donate!: http://bit.ly/DonateCTVM2. ~~~~~~~~~~~~~~~Additional Links~~~~~~~~~~~~~~~ More content: http://CalebCurry.com Facebook: http://www.facebook.com/CalebTheVideoMaker Google+: https://plus.google.com/+CalebTheVideoMaker2 Twitter: http://twitter.com/calebCurry Amazing Web Hosting - http://bit.ly/ccbluehost (The best web hosting for a cheap price!)
Views: 19050 Caleb Curry
Primary Key and Auto Increment in SQL
 
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SQL Server - Primary key and Auto Increment of Primary Keys
Views: 68205 bensonissac
how to auto increment varchar in sql server
 
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how to auto increment varchar in sql server
Views: 14778 Kannababu Banna
Auto generate number in oracle forms | Oracle apps
 
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declare v_temp emp.empno%type; begin select max(empno) into v_temp from emp; clear_form; v_temp:=v_temp+1; :emp.empno:=v_temp; end;
Views: 81 Young India
how to add auto increment in existing mysql table
 
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this video show how to add auto_increment id to existing table in mysql
Views: 6489 expert programming
How to Create a Increament Serial Number Row in MySQL
 
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how to generate sequence number in mysql how to add serial number in sql query how to update serial number in sql query mysql sequence function generate serial number in sql query oracle how to generate serial number in oracle report mysql insert sequential numbers how to generate auto increment serial number in sql server Website : http://intactabode.com/ linkedin https://www.linkedin.com/in/suryam-jy-ab471815b/ Google Plus https://plus.google.com/u/0/106052339846662160710 Twitter https://twitter.com/jysuryam Facebook https://www.facebook.com/intactabode/
Views: 503 Intact Abode
Oracle 11g otomatik artan primary key oluşturma (How to create auto Increment Primary Key)
 
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Oracle 11g otomatik artan primary key nasıl oluşturulur? (How to create auto Increment Primary Key) Abone olarak videolarımızı takibe alabilirsin. https://www.youtube.com/uygulamamadeni
Views: 155 uygulama madeni
How set Primary Key and auto Increment in Sql Server Database Tables 7
 
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For more detail visit: http://w3lectures.blogspot.com
Views: 94 ULearn Tutorials
Oracle create table and auto number using sql developer - 02
 
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Oracle create table and auto number using sql developer part-02. In this video show you how to create table, and how to create auto number on table in oracle using sql developer.
Views: 153 Ly Kimchrea
APEX04.SQL01: Examples of code to create sequences and triggers for tables in a database
 
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This video looks at an example of SQL code to create a sequence and set its starting value. We also look at a trigger that executes BEFORE a new record is inserted into a table. SQL scripts are at: http://db.kreie.net
Views: 426 Jennifer Kreie
51. Starting AUTO INCREMENT with a particular Number in SQL (Hindi)
 
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Views: 9770 Geeky Shows
Auto Increment in table sql  |  server tutorial  ✔
 
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Auto Increment in table sql server tutorial visit www.itguruji.rog facebook www.facebook.com/itguruji.org
Views: 676 IT Guruji -Official
MySQL Part 12 Auto Increment
 
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Auto increment column.
Views: 4201 Free OpenMentor
Auto Increment ID in SQL Table
 
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This tutorial will walk you through an easy way to create a table with an Auto incrementing ID, build a cluster index, and insert some values to demonstrate it working. Very easy way! GitHub Script: https://github.com/ProfessorPitch/ProfessorPitch/blob/master/SQL/Auto%20Increment%20ID.sql
Views: 19 ProfessorPitch
AUTO INCREMENT column when INSERT DATA (SQL)
 
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You may also want to learn: 1. Create, rename and drop database: https://youtu.be/lWQ6lWxeayk 2. Create Tables with Primary and Foreign Keys: https://youtu.be/-mKuOmg4A0o 3. Insert Data into Table: https://youtu.be/GpeRgX_Ct_E | https://youtu.be/XARh6U0_1BA 4. Auto-Increment Column: https://youtu.be/bfzNWwALK0k 5. Default Value Column: https://youtu.be/bdMyDysX-3w 6. Alter Data in Specific Column & Row: https://youtu.be/wQH2eENUIIQ 7. Join Multiple Tables: https://youtu.be/kD2D7uLyAh4 8. Retrieve Data based on Foreign Key: https://youtu.be/UwK-XARdaXE 9. Missing Data when Join Tables: https://youtu.be/lWLdf6guWa4 Thanks for watching! Support us by LIKE this video SUBSCRIBE our channel.
Views: 73 Code Expert
Auto Increment in Oracle in Telugu
 
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#KOTHA_ABHISHEK http://htmlintelugu1.blogspot.com http://cssintelugu1.blogspot.com http://javascriptintelugu1.blogspot.com http://sqlintelugu1.blogspot.com http://javaintelugu1.blogspot.com
Views: 607 KOTHA ABHISHEK
SQL AUTO INCREMENT Field Telugu | AUTO INCREMENT Column in SQL View-vlr training
 
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For All sql videos in telugu http://www.vlrtraining.in/sql-training-videos-telugu/ In Telugu: SQL AUTO INCREMENT Field Auto Increment primary key in MS SQL server SQL - AUTO INCREMENT How do I add an Auto Increment primary key in SQL Server database SQL Server Tutorial Beginner SQL Tutorial How to Define an Auto Increment Primary Key in SQL Server In English: download sql study material Website: http://www.vlrtrain.in/2016/09/download-sql-files.html Learn SQL sql tutorial for beginners sql commands oracle sql tutorial sql tutorial advanced mysql tutorial sql tutorial video SQL Tutorial, Tutorials SQL
Views: 478 VLR Training
How To Generate Auto Increment Serial number in SQL Server
 
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This Tutorial Teaches us how To add a column with AutoIncrement Serial number in SQL Server. For more Visits: www.edutechlearners.com
Views: 86560 EduTechLearners
Autoincrement of ID in Oracle
 
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How to auto increment of id in oracle,auto increment of id in oracle,
Views: 1923 Sawan Kumar
52. AUTO INCREMENT without specifying column name in SQL (Hindi)
 
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Views: 8246 Geeky Shows
Java and Oracle Tutorial | Insert Data to Oracle Database and create new auto ID
 
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How to insert customer's data to oracle database with new auto ID primary key as String(varchar2) datatype java code
Views: 2767 Rasmey Ty
Add Auto Increment Primary Key Column Existing Table SQL Server
 
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sql server tutorial on adding auto identity column with primary key to an existing table on remote database godaddy
How to Create Auto Increment Field in SQL Server Table
 
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Some times we need a field in any table which can increase its numeric value automatically to keep unique ID of each record or any other purpose. In this tutorial you will learn to create an Increment Field in a SQL Server table.
Views: 1402 hbksoft
Crear indice autoincrement en Oracle
 
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Forma sencilla de asignar una secuencia autoincremental a un indice en Oracle
SQL Server (MyLittleAdmin) Reset Table Auto Increment Column Id
 
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A live example on a Table Auto Increment ID Column Value In SQL Server Reset or Reseed
39.How to get primary key value (auto-generated keys) from inserted queries using JDBC?
 
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In this video you will learn How to get primary key value (auto-generated keys) from inserted queries in JDBC using a demo project. Below is the GitHub link to download source code: https://github.com/kishanjavatrainer/GetPrimaryKeyReturnDemo.git
Views: 3373 KK JavaTutorials
how to fetch autoincrement value to textbox from database in c#
 
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In this tutorial I will explain how to fetch auto increment value to textbox from database in c#. I have created form Registration where User will enter his details like name,address etc.the userid will be generated automatically. i have created table with Userid column made it as identity when user clicks on the this form i have textbox userid this textbox should display this auto genereated id.
Views: 17090 Project Shop
SQL Server - Auto increment & Compute column example.
 
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In this video we will learn how to Define an Auto Increment Primary Key and compute a column in SQL Server. Auto-increment allows a unique number to be generated when a new record is inserted into a table. and A computed column is a virtual column that is not physically stored in the table. A computed column expression can use data from other columns to calculate a value for the column to which it belongs.
Views: 1250 Golam Sarwar
make id as primary key with auto increment  in java db database
 
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this tutorial will show you how to create a table in java db with a column named id as a primary key with auto increment.
Views: 3264 Pranav anand
SelectTec | Aula Nº 34 | Sequence/Trigger - autoincrement Oracle
 
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Syntax: Criando a sequencia: CREATE SEQUENCE nome_da_sequencia minvalue 1 maxvalue 999 INCREMENT BY 1; Criando a trigger: CREATE OR REPLACE TRIGGER nome_TRIGGER BEFORE INSERT ON "tabela" FOR EACH ROW BEGIN SELECT "NOME_DA_SEQUENCIA".NEXTVAL INTO :new."CAMPO" FROM dual; END;
Views: 1772 SelectTec
How to Add Primary Key After Creating a Table | Add Foreign Key After Creating a Table | Oracle 12c
 
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How to Add Primary Key After Creating a Table | Add Foreign Key After Creating a Table | Oracle 12c --------------------------------------------------------------------------------------------------------- how to add primary key after creating a table,sql create table foreign key,alter table add primary key sql server,alter table add primary key mysql,alter table add primary key oracle,sql create table primary key autoincrement,sql server add primary key to existing table with data,sql composite primary key,cannot define primary key constraint on nullable column in table, foreign keys, constraints, oracle sql, primary key, how to, how to add primary key, primary key constraints, constraint, structured query language, oracle sql developer, oracle foreign keys, oracle foreign key, foreign, key, relational databases, database, how to create foreign keys, how to create foreign key, database constraints, sql tutorials for beginners, sql expert, sql expert tutorials, database, oracle, table, online training,insert into oracle,oracle insert into multiple rows,create table oracle,oracle 12c alter table add identity column,oracle create table default value sysdate,collections in oracle pl sql with examples,Oracle 12c, database, oracle database (software), sql, sql developer, sql tutorials, how to create database using dbca, how to create database in oracle,oracle cloud, database 12c, dba genesis,database services, database, create, 11g, dba, db, beginner, Please Subscribe My Channel
Autoincrement primary column in PostgreSQL
 
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Autoincrement primary column in PostgreSQL
Views: 39449 Alper KIZILGİL
How to create Primary Key in sql  using oracle 10g
 
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This video gives information about how to create primary key to table in oracle 10 g
Views: 1249 AvilTwo Beginer
How to create Virtual Columns in Oracle Database
 
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How to create Virtual Columns in Oracle Database 12c When queried, virtual columns appear to be normal table columns, but their values are derived rather than being stored on disc. The syntax for defining a virtual column is listed below. column_name [datatype] [GENERATED ALWAYS] AS (expression) [VIRTUAL] If the datatype is omitted, it is determined based on the result of the expression. The GENERATED ALWAYS and VIRTUAL keywords are provided for clarity only. The script below creates and populates an employees table with two levels of commission. It includes two virtual columns to display the commission-based salary. The first uses the most abbreviated syntax while the second uses the most verbose form. CREATE TABLE employees ( id NUMBER, first_name VARCHAR2(10), last_name VARCHAR2(10), salary NUMBER(9,2), comm1 NUMBER(3), comm2 NUMBER(3), salary1 AS (ROUND(salary*(1+comm1/100),2)), salary2 NUMBER GENERATED ALWAYS AS (ROUND(salary*(1+comm2/100),2)) VIRTUAL, CONSTRAINT employees_pk PRIMARY KEY (id) ); INSERT INTO employees (id, first_name, last_name, salary, comm1, comm2) VALUES (1, 'JOHN', 'DOE', 100, 5, 10); INSERT INTO employees (id, first_name, last_name, salary, comm1, comm2) VALUES (2, 'JAYNE', 'DOE', 200, 10, 20); COMMIT; Querying the table shows the inserted data plus the derived commission-based salaries. SELECT * FROM employees; ID FIRST_NAME LAST_NAME SALARY COMM1 COMM2 SALARY1 SALARY2 ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- 1 JOHN DOE 100 5 10 105 110 2 JAYNE DOE 200 10 20 220 240 2 rows selected. SQL The expression used to generate the virtual column is listed in the DATA_DEFAULT column of the [DBA|ALL|USER]_TAB_COLUMNS views. COLUMN data_default FORMAT A50 SELECT column_name, data_default FROM user_tab_columns WHERE table_name = 'EMPLOYEES'; COLUMN_NAME DATA_DEFAULT ------------------------------ -------------------------------------------------- ID FIRST_NAME LAST_NAME SALARY COMM1 COMM2 SALARY1 ROUND("SALARY"*(1+"COMM1"/100),2) SALARY2 ROUND("SALARY"*(1+"COMM2"/100),2) 8 rows selected. SQL Notes and restrictions on virtual columns include: 1)Indexes defined against virtual columns are equivalent to function-based indexes. 2)Virtual columns can be referenced in the WHERE clause of updates and deletes, but they cannot be manipulated by DML. 3)Tables containing virtual columns can still be eligible for result caching. 4)Functions in expressions must be deterministic at the time of table creation, but can subsequently be recompiled and made non-deterministic without invalidating the virtual column. In such cases the following steps must be taken after the function is recompiled: a)Constraint on the virtual column must be disabled and re-enabled. b)Indexes on the virtual column must be rebuilt. c)Materialized views that access the virtual column must be fully refreshed. d)The result cache must be flushed if cached queries have accessed the virtual column. e)Table statistics must be regathered. 5)Virtual columns are not supported for index-organized, external, object, cluster, or temporary tables. 6)The expression used in the virtual column definition has the following restrictions: a.It cannot refer to another virtual column by name. b.It can only refer to columns defined in the same table. c.If it refers to a deterministic user-defined function, it cannot be used as a partitioning key column. e.The output of the expression must be a scalar value. It cannot return an Oracle supplied datatype, a user-defined type, or LOB or LONG RAW.
Views: 507 OracleDBA
How to drop or disable Auto Increment Property of column in MySQL Table - MySQL Developer Tutorial
 
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How to drop or disable Auto Increment Property of column in MySQL Table explains if you need to remove the auto increment property from mysql table , how you remove auto increment feature. link to scripts used in MySQL Developer Tutorial / MariaDB developer Tutorial http://www.techbrothersit.com/2019/01/how-to-drop-or-disable-autoincrement.html MySQL Tutorial for Beginners MySQL Development Tutorial MySQL Tutorial for developers MySQL Development Training MySQL training for developers MySQL Workbench Tutorial MySQL DBA Certification Training MySQL DBA Tutorial Step by Step MySQL DBA Training online free MySQL Real Time DBA Tutorial MySQL Administration Course step by Step TechbrothersIT Tutorials
Views: 74 TechBrothersIT
AutoNumber, Identity and Using Sequences as Default Values in Oracle
 
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In this video we demonstrate the legacy method to implement autonumber or identity functionality in the Oracle database, as well as the new features in Oracle 12c that can be used to replace this method. For more information see: https://oracle-base.com/articles/misc/autonumber-and-identity https://oracle-base.com/articles/12c/identity-columns-in-oracle-12cr1 https://oracle-base.com/articles/12c/default-values-for-table-columns-enhancements-12cr1#sequences Website: https://oracle-base.com Blog: https://oracle-base.com/blog Twitter: https://twitter.com/oraclebase Cameo by Alex Zaballa Blog: http://alexzaballa.blogspot.co.uk/ Twitter: https://twitter.com/alexzaballa Cameo appearances are for fun, not an endorsement of the content of this video.
Views: 7489 ORACLE-BASE.com
Oracle 10g  Create table  and insert values in table In 2 mintes..
 
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in oracle database how create table, insert values es video me app yh shikhenge ki table kasi bante hai or values kaise insert karate hai
SQL Server 26 - PRIMARY KEY, NOT NULL, UNIQUE
 
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In the last video we created our first table, but I want to give SQL Server some extra information so the database knows more about each of the columns. The first thing is to establish the primary key. To do this all we do is add PRIMARY KEY after the column we want to be the primary key. Simple enough. When we add a constraint right after the column like this, it is often called a column attribute. CREATE TABLE Animals( ID INT PRIMARY KEY, Name VARCHAR(50), Species VARCHAR(50) ); Additionally, if you are using an ID column, it is best to have it labeled as the IDENTITY column. That way, SQL Server will automatically increment the number. CREATE TABLE Animals( ID INT PRIMARY KEY IDENTITY, Name VARCHAR(50), Species VARCHAR(50) ); The other attributes we've discussed in this series are NOT NULL and UNIQUE. We can make the name NOT NULL and the species NOT NULL. We don't have a good column for UNIQUE, so let's add one: CREATE TABLE Animals( ID INT PRIMARY KEY IDENTITY, Name VARCHAR(50) NOT NULL, Species VARCHAR(50) NOT NULL, ContactEmail VARCHAR(50) NOT NULL UNIUQE ); You can see that it is very easy to add multiple column attributes to a column. Just separate them by spaces. The order does not matter. Also, when you say primary key the column is automatically NOT NULL and UNIQUE. There are other attributes you can use including DEFAULT, FOREIGN KEY, and SPARSE. DEFAULT will give a value for a column if you do not put anything in yourself. Foreign keys are used to reference other columns. SPARSE is an attribute we haven't discussed. You can use SPARSE if most of the rows are going to have a NULL for a column and it saves storage space, but we will worry about that in another video. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Support me! http://www.patreon.com/calebcurry Subscribe to my newsletter: http://bit.ly/JoinCCNewsletter Donate!: http://bit.ly/DonateCTVM2. ~~~~~~~~~~~~~~~Additional Links~~~~~~~~~~~~~~~ More content: http://CalebCurry.com Facebook: http://www.facebook.com/CalebTheVideoMaker Google+: https://plus.google.com/+CalebTheVideoMaker2 Twitter: http://twitter.com/calebCurry Amazing Web Hosting - http://bit.ly/ccbluehost (The best web hosting for a cheap price!)
Views: 5242 Caleb Curry
Create Table Oracle
 
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Exemplo da criação de uma tabela de clientes no banco de dados Oracle
Views: 70 Tecla Nossa
SQL script to insert into many to many table
 
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Text Article http://csharp-video-tutorials.blogspot.com/2017/02/sql-script-to-insert-into-many-to-many.html Slides http://csharp-video-tutorials.blogspot.com/2017/02/sql-script-to-insert-into-many-to-many_6.html SQL Server Interview Questions and Answers text articles & slides http://csharp-video-tutorials.blogspot.com/2014/05/sql-server-interview-questions-and.html SQL Server Interview Questions and Answers playlist https://www.youtube.com/playlist?list=PL6n9fhu94yhXcztdLO7i6mdyaegC8CJwR All Dot Net and SQL Server Tutorials in English https://www.youtube.com/user/kudvenkat/playlists?view=1&sort=dd All Dot Net and SQL Server Tutorials in Arabic https://www.youtube.com/c/KudvenkatArabic/playlists In this video we will discuss how to insert data into a table that has many-to-many relationship Create table Students ( Id int primary key identity, StudentName nvarchar(50) ) Go Create table Courses ( Id int primary key identity, CourseName nvarchar(50) ) Go Create table StudentCourses ( StudentId int not null foreign key references Students(Id), CourseId int not null foreign key references Courses(Id) ) Go Students - Id column is identity column Courses - Id column is identity column StudentCourses - StudentId and CourseId columns are foreign keys referencing Id column in Students and Courses tables As you can see, StudentCourses is a bridge table that has many to many relationship with Students and Courses tables. This means a given student can be enrolled into many courses and a given course can have many students enrolled. Below is the question asked in an interview for SQL Server Developer role. Write a SQL script to insert data into StudentCourses table. Here are the rules that your script should follow. 1. There will be 2 inputs for the script Student Name - The name of the student who wants to enroll into a course Course Name - The name of the course the student wants to enroll into 2. If the student is already in the Students table, then use that existing Student Id. If the student is not already in the Students table, then a row for that student must be inserted into the Students table, and use that new student id. 3. Along the same lines, if the course is already in the Courses table, then use that existing Course Id. If the course is not already in the Courses table, then a row for that course must be inserted into the Courses table, and use that new course id. 4. There should be no duplicate student course enrollments, i.e a given student must not be enrolled in the same course twice. For example, Tom must not be enrolled in C# course twice. Answer : To avoid duplicate student course enrollments create a composite primary key on StudentId and CourseId columns in StudentCourses table. With this composite primary key in place, if someone tries to enroll the same student in the same course again we get violation of primary key constraint error. Alter table StudentCourses Add Constraint PK_StudentCourses Primary Key Clustered (CourseId, StudentId) Here is the SQL script that inserts data into the 3 tables as expected Declare @StudentName nvarchar(50) = 'Sam' Declare @CourseName nvarchar(50) = 'SQL Server' Declare @StudentId int Declare @CourseId int -- If the student already exists, use the existing student ID Select @StudentId = Id from Students where StudentName = @StudentName -- If the course already exists, use the existing course ID Select @CourseId = Id from Courses where CourseName = @CourseName -- If the student does not exist in the Students table If (@StudentId is null) Begin -- Insert the student Insert into Students values(@StudentName) -- Get the Id of the student Select @StudentId = SCOPE_IDENTITY() End -- If the course does not exist in the Courses table If (@CourseId is null) Begin -- Insert the course Insert into Courses values(@CourseName) -- Get the Id of the course Select @CourseId = SCOPE_IDENTITY() End -- Insert StudentId & CourseId in StudentCourses table Insert into StudentCourses values(@StudentId, @CourseId) If required, we can very easily convert this into a stored procedure as shown below. Create procedure spInsertIntoStudentCourses @StudentName nvarchar(50), @CourseName nvarchar(50) as Begin Declare @StudentId int Declare @CourseId int Select @StudentId = Id from Students where StudentName = @StudentName Select @CourseId = Id from Courses where CourseName = @CourseName If (@StudentId is null) Begin Insert into Students values(@StudentName) Select @StudentId = SCOPE_IDENTITY() End If (@CourseId is null) Begin Insert into Courses values(@CourseName) Select @CourseId = SCOPE_IDENTITY() End Insert into StudentCourses values(@StudentId, @CourseId) End Use the following statement to execute the stored procedure Execute spInsertIntoStudentCourses 'Tom','C#'
Views: 89101 kudvenkat