How to add check constraint in field by SQL Script
How to add check constraint in field by SQL Script:
In this video I have shown how to add a check constraint in SQL Server table field by design view.
Suppose in SQL field one field we have to fill the value within a range or have to maintain a range when we insert data in the table. For this case we can set it by creating check constraint by which every data will by checked through the constraint and will show an error if data is out of range.
These process can be done by to ways : by design view and SQL script .
here I have shown how to do to do it by design SQL script
To do this we have to create table then alter the table
Designer process:
We can also set it from design view when creating table or after creating table:
For doing this click on the field in table design option then see constraint tab -- Right mouse - Create new constraint -- Set required expression -- Set Name of constraint -- Close
Syntax of check constraint:
ALTER TABLE tableName
ADD CONSTRAINT ConstraintName CHECK (EXPRESSION…)
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