What is SQL Constraints? tririd.com
SQL Constraints are rules used to limit the type of data that can go into a table, to maintain the accuracy and integrity of the data inside table.
Constraints can be divided into following two types,
- Column level constraints : limits only column data
- Table level constraints : limits whole table data
Constraints are used to make sure that the integrity of data is maintained in the database. Following are the most used constraints that can be applied to a table.
- NOT NULL
- PRIMARY KEY
- FOREIGN KEY
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