SQL語句分類變量計數與百分比統計

SQL語句分類變量計數與百分比統計 select reviewAverage,count(reviewAverage) as count from table_nm group by reviewAverage having reviewAverage is not null order by reviewAverage 簡單的查詢語句大家都比較容易的理解。select 字段A,count(A)

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