Thanks, Rick! I had forgotten all about variables for some strange reason...
The subselect isn't nearly as nice as variable, because I'd have to repeat it several times. On 5 Oct 12, at 20:19, mysql-digest-h...@lists.mysql.com wrote: > From: Rick James <rja...@yahoo-inc.com> > > One way: > > SELECT @foo := this + that, > more_stuff + @foo > FROM ...; > > Another way: > > SELECT foo, > more_stuff + foo > FROM ( > SELECT this + that AS foo > FROM ... ) x; > >> -----Original Message----- >> From: Jan Steinman [mailto:j...@bytesmiths.com] >> >> I would like to refer to calculated columns in other columns. I thought >> a column alias would do it, but apparently they're only for >> aggregation, like GROUP BY. >> >> Other than repeating the entire calculation, what techniques are >> available for accessing such a calculation? >> >> I'm calculating an electric bill, based on meter readings. I need to >> subtract two meter readings, and use that number in several other >> calculations, for example. >> ---------------- :::: I see rejection in my skin, worry in my cancers, bitterness and hate in my aching joints. I failed to take care of my mind, and so my body now goes to hospital. -- Astrid Alauda :::: Jan Steinman, EcoReality Co-op :::: -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/mysql
