What you also have to keep in mind is that one clause is not necessarily keeping you from getting zero rows. For example. You have st_name and city. Say you hve 5 entries for a street named "main" and 5 entries for a city named "plainfield". But you have NO entries for a street named "main" in the city of "plainfield". The fact you are looking for both is what returns zero rows. Individually they exist. What you are trying to do is nto easy at all. You can't just do if statements to see which column has zero rows. You have to also check to see what combo of clauses return ero. Adam Lang Systems Engineer Rutgers Casualty Insurance Company http://www.rutgersinsurance.com ----- Original Message ----- From: "Heather Johnson" <hjohnson@xxxxxxxxxx> To: <Timothy_Maguire@xxxxxxxxxxxxxx> Cc: <pgsql-php@xxxxxxxxxxxxxx>; <pgsql-php-owner@xxxxxxxxxxxxxx> Sent: Thursday, July 26, 2001 2:30 PM Subject: Re: [PHP] Re: how to determine where a select statement fails > Thanks for the suggestion! I don't really want to do that though b/c the > table that I'm searching is pretty large. I was hoping to do only one query > on the table and then put some indexes on the fields to improve performance. > But I can't think of a way to structure my code so that I can do just one > query AND get info about which user-entered values don't find a match. > (Brent Matzelle suggested that this isn't really a "failure" of the query, > and I guess he's right, so hopefully this describes what I'm talking about a > little better). > > Heather > > "Heather Johnson" > > <hjohnson@xxxxxxxxxx To: > <pgsql-php@xxxxxxxxxxxxxx> > > > cc: > > Sent by: Subject: how to > determine where a select statement > > pgsql-php-owner@post fails > > gresql.org > > > > > > 07/26/01 11:15 AM > > > > > > > > > > > > > > I am using php to do a select query which returns rows on the condition > > that > > a conjunction is true in the WHERE clause. This is the SELECT statement: > > > > SELECT low_range, high_range, st_name, city, zip FROM router > > WHERE st_name = '$st_name' AND city = '$city' AND zip = '$zip'; > > > > In the event that the query fails to return any rows, I'd like to be able > > to > > determine which conjunct caused it to fail. So, for example, if the > > user-entered $st_name isn't in the router table, I'd like to know that > > st_name = '$st_name' is what made the conjunction false and caused the > > query > > to fail. $pg_errormsg isn't this specific about query failures though. > Does > > anyone know how I might be able to get this information? > > > > Thanks! > > Heather Johnson ---------------------------(end of broadcast)--------------------------- TIP 1: subscribe and unsubscribe commands go to majordomo@xxxxxxxxxxxxxx
