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SQL -Structured Query Language - Sql Key & Constraint - Primary Key Tutorial

Primary Key Constraint is used, when we want each record to be uniquely identified. Column defines with Primary key Constraint will never repeat its value and cannot be null.

 

The syntax for the primary key-

 

create table user_detail

(

    id int primary key,

    name varchar(50) not null,

    email varchar(50) unique,

    DOB date

);

In this, we define id with the primary key constraint. Hence it will always remain unique and cannot be null for the user_detail table.

SQL -Structured Query Language

SQL -Structured Query Language

  • Introduction
  • Overview
    • How To Download And Install MySql Workbench
    • SQL Syntax
  • SQL Database
    • Create Database
    • Drop Database
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  • SQL Table
    • Create Table
    • Alter - Rename Table
    • Alter - Add Column
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    • Alter - Drop Column
    • Copy Table
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  • SQL Insert
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  • Sql Clause
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  • Sql Key & Constraint
    • Primary Key
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    • Not Null Constraint
    • Check Constraint
    • Default Constraint
  • Normalization
    • Overview
    • 1 NF
    • 2 NF
    • 3 NF
    • Boyce Codd normal form ( BCNF )

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