Database(MySQL) Intermedia Level 01 : SQL Constraints
SQL constraints are used to specify rules for the data in a table.
1) Not null: Ensures that a column cannot have a Null value
2) Unique : Ensures that all values in a column are different
3)Check: Ensures that the values in a column satisfies a specific condition
4) Default : Sets a default value for a column if no value is specified.
see you to the next video with : primary key and Foreign key.