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並前往https://medium.com/@kyleallbright/sql-count-using-sum-case-with-multiple-date-ranges-and-where-conditions-f0d4f6d051a2

SQL — Count (*) using SUM CASE with multiple date ranges ...

It turns out that in SQL, SUM will do the same thing as the COUNT function when used with a CASE statement. If we use our existing WHERE clause ...

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