Beefy Boxes and Bandwidth Generously Provided by pair Networks
laziness, impatience, and hubris
 
PerlMonks  

•Re: Re: Re: MySQL question

by merlyn (Sage)
on Mar 28, 2002 at 22:28 UTC ( #155138=note: print w/ replies, xml ) Need Help??


in reply to Re: Re: MySQL question
in thread MySQL question

Ahh. Then again, with a real database with subselects, that'd be:

SELECT title, doc_num, version FROM atable WHERE (doc_num, version) IN ( SELECT doc_num, MAX(version) FROM atable GROUP BY doc_num );
Again, this won't work in puny MySQL. PostgreSQL or better, baby!

-- Randal L. Schwartz, Perl hacker


Comment on •Re: Re: Re: MySQL question
Download Code
Re: •Re: Re: Re: MySQL question
by rbc (Curate) on Mar 29, 2002 at 17:10 UTC
    If Kozz cannot upgrade to PostgreSQL for some reason couldn't Kozz ape a subselect with by creating a tempory table "ttable" and then join "atable" with that? sonething like this ...
    create table ttable as SELECT doc_num, MAX(version) FROM atable GROUP BY doc_num; SELECT title, doc_num, version FROM atable a, ttable t WHERE a.doc_num = t.doc_num and a.version = t.version;

    ... I don't know about the other monks I find SQL
    fun like its a weird puzzle.

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://155138]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others perusing the Monastery: (6)
As of 2014-07-12 18:44 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    When choosing user names for websites, I prefer to use:








    Results (240 votes), past polls