On Wed, Nov 02, 2011 at 07:22:09AM -0400, Chris Dumoulin wrote: > And we're doing an insert like this: > INSERT INTO Item (Sig, Type, Data) SELECT $1,$2,$3 WHERE NOT EXISTS > ( SELECT NULL FROM Item WHERE Sig=$4) > > In this case $1 and $4 should always be the same. FWIW, If they're always going to be the same, you can put that it the query, like so: INSERT INTO Item (Sig, Type, Data) SELECT $1,$2,$3 WHERE NOT EXISTS ( SELECT NULL FROM Item WHERE Sig=$1) Saves a parameter. > I don't see how it's possible to get duplicate rows here, unless > maybe the "select where not exists" is somehow returning multiple > rows. > Any ideas what's going on here? As pointed out by others, you don't say if it this is a race condition between processes or if it always does this. Have a nice day, -- Martijn van Oosterhout <kleptog@xxxxxxxxx> http://svana.org/kleptog/ > He who writes carelessly confesses thereby at the very outset that he does > not attach much importance to his own thoughts. -- Arthur Schopenhauer
Attachment:
signature.asc
Description: Digital signature
