In MySQL a "show create table" gives me : ... PRIMARY KEY (`ID`,`CountryCode`,`LanguageCode`), UNIQUE KEY `unique_my table_4` (`ID`,`CountryCode`,`LanguageCode`), ...
So, In PostgreSQL, does it make sense to create a primary key AND a unique index based on the same columns?
Is PostgreSQL smart enough to use the unique index created for the primary key.
I know PostgreSQL can be based on a unique index to create a primary key but I also know it is possible to create several indexes on the same columns with the same order.