Knowledge Walls
Gopal Rao
Mumbai, Maharashtra, India
Passcode:
Queries
How to select all column values from table in sql How to rename the column in SQL How to create table in SQL How to add a new column to table in SQL How to change the data type of the column in SQL How to delete/remove column from table in SQL How to remove/delete the column(truncate) values from Table in SQL
Queries [cont'd]
How to delete table from database in SQL How to use select command in SQL How to add default value to the column in SQL How to add current system date and time to the column in SQL How to insert the values to the table columns in SQL How to create primary key to column in SQL How to create the foreign key for column in SQL
Queries [cont'd]
Referencing a foreign key to the primary key of the same table How to select the maximum value from sql column How to create a column with auto increment in sql server Identity column in sql server example Where condition in sql query And query in sql server Not like query in sql server
Queries [cont'd]
Or and and condition in sql server Like in sql server Using like and in sql together Subquery in sql server example Distinct in sql server example Having clause in sql server examples Count in sql server example
Queries [cont'd]
Truncate stored procedure sql server Create table in stored procedure sql server Delete / drop table in stored procedure sql server
How to create primary key to column in SQL
2414 Views
Syntax
columnName dataType primary key
Example
CREATE TABLE Department
(Dept_no varchar(5) primary key,
Dept_name varchar(20),
location varchar(20));
Hints 
Primary key is like a id(unique).if you insert the same values in the primary key column it wont allow the values inside the column.While run the query it shows some error.Different types of keys available for different purpose.Some of the keys names are foreign key,super key,unique key etc.,

NOTE: When you are creating the table give like this.
  Copyright © 2014 Knowledge walls, All rights reserved
KnowledgeWalls
keep your tutorials and learnings with KnowledgeWalls. Don't lose your learnings hereafter. Save and revise it whenever required.
Click here for more details