On Sat, Feb 21, 2004 at 05:20:51PM +0900, Alex wrote: > Hi, > I need some help with a query. > I use a reference table to lookup some codes. Everything works well if the > reference table contains a reference but the query fails if no reference > fails (Z.ref_code=123456). What I need to is either return 0 or null into > Z.prim_exch if no reference can be found. Whats the best way to do that ? I > tried a sub query but also did not succeed.
Lookup an SQL site about OUTER JOINS. Should do what you want. -- Martijn van Oosterhout <[EMAIL PROTECTED]> http://svana.org/kleptog/ > If the Catholic church can survive the printing press, science fiction > will certainly weather the advent of bookwarez. > http://craphound.com/ebooksneitherenorbooks.txt - Cory Doctorow
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