[GENERAL] Verifying a user.

[Thomas Hallgren]

I'm connected to a database and I want to verify that a username and 
password for some user is correct. I know I can verify a users existence 
by doing:

select exists(select * from pg_user where usename = $1)
but I would like to verify the correctness of the password as well. Is 
there a way to do that using SQL?

Regards,
Thomas Hallgren
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