Re: Performance on 2 table operations
Posted by:
Rick James
Date: January 02, 2013 04:59PM
DynID should be the same type in both tables. (But I don't think that is a performance issue, in this case.)
Would this give you the ids of the desired writers?
SELECT DynId, MAX(WriteDate) AS Latest
FROM publications
GROUP BY DynId
ORDER BY Latest DESC
LIMIT 5;
If so, then something like this might be close to what you want:
SELECT w.*
FROM
( SELECT DynId, MAX(WriteDate) AS Latest
FROM publications
GROUP BY DynId
ORDER BY Latest DESC
LIMIT 5
) x
JOIN writers w ON w.DynId = x.DynId
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December 29, 2012 03:23AM
Re: Performance on 2 table operations
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January 02, 2013 04:59PM
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