How to query

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#174

From: Hs
Date: Sat, 05 Jul 2008 13:44

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This is my table:

CREATE TABLE "BUY" 
(
  "CUSTOMER_ID" INTEGRER,
  "WEIGHT" 	INTEGER,
  "BUY_DATE"	DATE
);

I want: SELECT "CUSTOMER_ID", SUM("WEIGHT" * CostA or CostB) TOTAL_COST 
            FROM BUY GROUP BY "CUSTOMER_ID";

The problem: I should use CostA when "BUY_DATE" is before 2000/10/10 and CostB when it is after 2000/10/10.
can I do it in one query? what is the best other way?

Thanks.

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