GROUP BY ?| ?HAVING?

-- 查詢資金重復的記錄
select DISTINCT prj_id,`year`, `month`
from cm_receivable?
GROUP BY prj_id,`year`, `month`
HAVING COUNT(*) > 1?
ORDER BY prj_id,`year`, `month`

等價于

select * from (
select prj_id,`year`, `month`, count(*) count
from cm_receivable?
GROUP BY prj_id,`year`, `month`
) a where a.count>1

總結

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