So the issue is that instead of taking 174 seconds the query now takes
201?
I'm guessing that SQL server might be using index covering, but that's
just a guess. Posting query plans (prefferably with actual timing info;
EXPLAIN ANALYZE on PostgreSQL and whatever the equivalent would be for
MSSQL) m
I DON'T KNOW WHAT TO DO WITH THIS QUERYS...
Comparation with sql server, sql server wins !!!
Table sizes:
archivos: 40MB
fotos: 55MB
select count(1) from fotos f where not exists (select a.archivo from
archivos a where a.archivo=f.archivo)
173713 ms.
110217 ms.
83122 ms.
select count(*) from
