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DISTINCT and dedup: when a join inflates your total | SQL interview
A doubled total usually isn't bad data. It's duplicated rows. DISTINCT removes duplicate rows from a result. But reaching for it on a blown-up SUM is treating the symptom, not the cause. A join to a table with multiple matches fans each order row out into several copies, and SUM happily adds every copy. DISTINCT on the rows won't fix the sum ...
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