Look at Case When ... clause. For each value found return a different value
Case
When zip = 33166 'ZIP'
When City 'MAIMI' 'CITY'
When county = 'DADE' 'COUNTY'
When State = 'FL' 'STATE
End as MatchField
The column MatchField in your result will tell you which value matched: ZIP/CITY/COUNTY/STATE
-----Original Message-----
From: MIDRANGE-L <midrange-l-bounces@xxxxxxxxxxxxxxxxxx> On Behalf Of x y
Sent: Thursday, February 2, 2023 3:26 PM
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxxxxxxxx>
Subject: SQL SELECT: controlling the order of evaluation
When I have multiple conditions on my WHERE clause, can I control the order in which they're evaluated?
Example: the client in postal code 33166, Miami, Dade County, Florida, is looking for a local resource. I'd like to write select {} from {} where state='FL' or county='DADE' or city='MIAMI' or postal='33166' fetch first row only and then tell SQL to return a result by evaluating first on postal, then city, then county, and then state.
I'm trying to avoid multiple SELECT statements. It's impractical to add "helper" data in the table, which will have > 100 million records. Putting "postal='33166'" first doesn't provide the desired result. A UNION ALL won't work. I don't think a JOIN will work but I'm trying to figure out how it might work.
It looks like SQL selects the first row that meets any of the selection criteria, i.e., SQL is giving all the conditions equal weight). I'm using CASE in my ORDER BY for other requirements but I can't figure out if that's the solution here.
Thanks for your ideas!
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