Neil Conway 0ebf1cc834 Implement 4 new aggregate functions from SQL2003. Specifically: var_pop(), ... var_samp(), stddev_pop(), and stddev_samp(). var_samp() and stddev_samp() are just renamings of the historical Postgres aggregates variance() and stddev() -- the latter names have been kept for backward compatibility. This patch includes updates for the documentation and regression tests. The catversion has been bumped. NB: SQL2003 requires that DISTINCT not be specified for any of these aggregates. Per discussion on -patches, I have NOT implemented this restriction: if the user asks for stddev(DISTINCT x), presumably they know what they are doing.		2006-03-10 20:15:28 +00:00
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FAQ	Done though the second is default so off in 8.2:	2006-03-06 22:51:20 +00:00
sgml	Implement 4 new aggregate functions from SQL2003. Specifically: var_pop(),	2006-03-10 20:15:28 +00:00
Makefile	$Header: -> $PostgreSQL Changes ...	2003-11-29 19:52:15 +00:00