Sql constraintsa constraint is a rule or limitation that we place on the data in a database that we can put into a column(s). a constraint is part of the table. we can apply constraints when we create ...

SQL constraints are used to specify rules for the data in a table. Constraints are used to limit the type of data that can go into a table. This ensures the accuracy and reliability of the data in the ...

* Unique Constraint >>>> It will not allow the duplicate values and it will allow only one null value. >>>> We can apply this constraint Columns level & Table level >>>> We can add the unique ...

Constraints in sql are used to define rules for the table and columns in a database and also make sure that data are accurate and trusted in the database. constraints are responsible for the ...