Unique Constraints in MySQL || MySQL Tutorial Series || Code With Neha
MySQL UNIQUE Constraint
A UNIQUE constraint in MySQL ensures that all values in a column or a set of columns are distinct from one another. This constraint is used to prevent duplicate entries in a column or combination of columns, maintaining data integrity.
Both the UNIQUE and PRIMARY KEY constraints provide a guarantee for uniqueness for a column or set of columns.
A PRIMARY KEY constraint automatically has a UNIQUE constraint.
However, you can have many UNIQUE constraints per table, but only one PRIMARY KEY constraint per table.
SYNTAX:-
UNIQUE Constraint on CREATE TABLE
CREATE TABLE table_name (
৫ column_name data_type UNIQUE,
...
);
Or
CREATE TABLE table_name (
column_name 1 data_type ,
column_name 2 data_type ,
.....
Unique (column_name)
);
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