Alexander Farber wrote:
I wonder, what is faster: fetching 2 columns - the
username and the md5-result and then comparing the
md5 string against the argument in my app, like here:

punbb=> select username, md5('deadbeef' || password) from users where id = 4;
username |               md5
----------+----------------------------------
Vasja    | dcde745cc304742e26d62e683a9ecb0a
(1 row)

Why don't you store the hashed value instead?

--
Alban Hertroys
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magproductions b.v.

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