SQL constraints are used to specify any rules for the records in a table.
Constraints can be used to limit the type of data that can go into a table.
It ensures the accuracy and reliability of the records in the table, and
if there is any violation between the constraint and the record action,
the action is aborted. Constraints can be column level or table level.
Column level constraints apply to a column, and table-level constraints
apply to the whole table.
This is the Part 1 series
1. Not Null
2. Unique
3. Primary Key
4. Foreign Key
5. Check
6. Default
7. Index
#mysqltutorial
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