> 4) INDEXESI can certainly add an index but given the table sizes I am not > sure if that is a factor. This by no means is a large dataset less than > 350,000 rows in total and 3 columns. Also this was just a quick dump of > data for comparison purpose. When I saw the poor performance on the > COALESCE, I pointed the data load to SQL Server and ran the same query > except with the TSQL specific ISNULL function. 350000 rows definitely is a lot of rows, although with 3 INT column it's just about 13MB of data (including overhead). But indexes can be quite handy when doing joins, as in this case. Tomas -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
