SQL Server Constraints

Published: 17 May 2022
on channel: DotnetMaster

Constraints in SQL Server are rules/validation and restrictions applied on a column or a table such that unwanted/invalid data can't be inserted into tables. This ensures the accuracy and reliability of the data in the database. We can create constraints on single or multiple columns of any table. Constraints maintain the data integrity and accuracy in the table.

constraints in SQL server :

1) Not Null
2) check
3) Default:
4) unique key
5) primary key
6) foreign key

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