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Sunday, 15 January 2017

sql check with example

SQl MYSQL check with example

CHECK Constraint can be defined on a single column or complete table to limit the value


Example of Check IN MYSQL
Create Table Employee
(
E_id Int Not Null,
Name varchar(255),
City varchar(250),
Primary key(E_id),
CHECK (E_id>1)
)
Example of Check IN SQL
Create Table Employee
(
E_id Int Not Null Primary key(E_id) CHECK (E_id>1),
Name varchar(255),
City varchar(250),
)
Check can also be added by altering the Table
Example:
ALTER TABLE Employee

ADD CHECK (E_id>1)
Check can also be Dropped by altering the Table
Example in MYSQL:
ALTER TABLE Employee
DROP CHECK chk_Employee
Example in SQL:
ALTER TABLE Employee
DROP CONSTRAINT chk_Employee

Tag:SQL Check constraint with example

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