SQL : Why would SUM(COL1 + COL2) and SUM(COL1) + SUM(COL2) yield differently?

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SQL : Why would SUM(COL1 + COL2) and SUM(COL1) + SUM(COL2) yield differently?
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SQL : Why would SUM(COL1 + COL2) and SUM(COL1) + SUM(COL2) yield differently?
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SUM(COL2) COL2) differently? would Why SUM(COL1) yield SQL + + and : SUM(COL1



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