Web Reference: Dec 15, 2020 · This article will teach you what a CASE WHEN expression is in SQL and how to use it with a SUM () function and a GROUP BY statement. The examples are included to bolster your understanding. Mar 17, 2026 · In analytics SQL, the fastest way to slice metrics without multiple passes over your table is the SUM(CASE WHEN …) pattern which is often called a SQL conditional sum. It lets you total only the rows that meet a condition (or set of conditions) directly inside a single grouped query. Jun 1, 2016 · I want to do count for each row from table but I get this error: Can not perform an aggregate function on an expression containing an aggregate or a subquery.
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