"Andrus" <eetasoft@xxxxxxxxx> writes: > How to speed the following query? It seems to run forever. > explain SELECT > bilkaib.DB, > CASE WHEN dbkonto.objekt1='+' THEN bilkaib.DBOBJEKT ELSE '' END AS dbobjekt, > CASE WHEN dbkonto.objekt2='+' THEN bilkaib.DB2OBJEKT ELSE '' END AS > db2objekt, > CASE WHEN dbkonto.objekt3='+' THEN bilkaib.DB3OBJEKT ELSE '' END AS > db3objekt, > ... > GROUP BY > 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26 I think the problem is probably that you're sorting two dozen CHAR columns, and that in many of the rows all these entries are '' forcing the sort code to compare all two dozen columns (not so)? So the sort ends up doing lots and lots and lots of CHAR comparisons. Which can be slow, especially in non-C locales. What's your locale setting? regards, tom lane
