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以下是我用來將數據提供給jquery數據表的查詢。 從這個查詢中,我需要結果以及總行數。所以,我將總行數作爲子查詢返回。mysql子查詢運行一次或多次等於沒有記錄?
SELECT m.*,
(SELECT COUNT(*)
FROM member m
INNER JOIN relationship r ON m.ID = r.Relative_ID
WHERE r.Member_ID=33) as TotalRows
FROM member m
INNER JOIN relationship r ON m.ID = r.Relative_ID
WHERE r.Member_ID=33
ORDER BY 1 asc
LIMIT 0, 10
子查詢是將totalrows運行一次或10次還是多次?