Re: primary key and unique index

On 23 March 2018 at 20:55, Thomas Poty <thomas.poty@gmail.com> wrote:
> 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.

Doing this makes no sense in PostgreSQL.  I'm struggling to imagine
why it would in MySQL.


-- 
 David Rowley                   http://www.2ndQuadrant.com/
 PostgreSQL Development, 24x7 Support, Training & Services