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Unique « Table « MySQL Tutorial
MySQL Tutorial
Table
Unique
4.17.Unique
4.17.1.
Unique Keys: A unique index allows only unique values in the column.
4.17.2.
You can create more than one unique key.
4.17.3.
Add Unique constaints to cover two columns
4.17.4.
ALTER TABLE table_name ADD UNIQUE index_name (column_name[,...]);