select distinct n.cognateid, m.isirefid,4, linkdate from mt.externallink l, refidmatch m, nametag n where l.objectid = n.geneid and m.pubmedid = l.identifier and externaldbid = 9 and l.identifier in (select identifier from mt.externallink where externaldbid = 9 group by identifier having count(distinct objectid) < 6);
HTH, Dave
[EMAIL PROTECTED] wrote:
Hi,
This query took a few minues to return 126K rows (fast):
select distinct n.cognateid, m.isirefid,4, linkdate from mt.externallink l, refidmatch m, nametag n where l.objectid = n.geneid and m.pubmedid = l.identifier and externaldbid = 9;
But this query took hours and still no result, I had to kill it:
select distinct n.cognateid, m.isirefid,4, linkdate from mt.externallink l, refidmatch m, nametag n where l.objectid = n.geneid and m.pubmedid = l.identifier and externaldbid = 9 and (select count(distinct objectid) from mt.externallink k where k.identifier = l.identifier and externaldbid = 9 and l.objectid !=k.objectid)<5;
All the related columns are indexed and table are analyzed. Is there a way to re-write the part
select count(distinct objectid) from mt.externallink k where k.identifier = l.identifier and externaldbid = 9 and l.objectid !=k.objectid)<5
to make the whole thing faster?
TIA.
Guang
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