Default Constraint in MySQL || MySQL Tutorial Series || Code With Neha
MySQL DEFAULT Constraint
MySQL DEFAULT constraint returns the default value for a table column. The DEFAULT value of a column is a value used in the case, when there is no value specified by the user.
To use this function there should be a DEFAULT value assigned to the column. Otherwise, it will generate an error.
Syntax
DEFAULT (column_name)
Where, column_name:
Name of column whose default value is written.
How to Add DEFAULT CONSTRAINT
To add a DEFAULT constraint to a MySQL table, there are two methods available.
Using CREATE TABLE Statement
Using ALTER TABLE Statement
Using DEFAULT Constraint on CREATE TABLE
Syntax
CREATE TABLE table_name (
column1 data_type DEFAULT default_value,
column2 data_type DEFAULT default_value, ... );
Add DEFAULT Constraint with ALTER TABLE Statement
Syntax
ALTER TABLE table_name ALTER column_name SET DEFAULT default_value;
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