MySQL沒有任何排名功能,但您可以使用變量來創建偽行號.

使用：

SELECT x.*

FROM (SELECT cm.id,

cm.title AS cmtitle,

cm.sectionid,

cm.type AS cmtype,

cd.id AS cd_id,

cd.time,

cd.link,

cd.title,

cd.description,

cd.sectionid AS cd_sectionid,

CASE

WHEN @sectionid != cm.sectionid THEN @rownum := 1

ELSE @rownum := @rownum + 1

END AS rank,

@sectionid := cm.sectionid

FROM C_MAIN cm,

C_DATA cd,

(SELECT @rownum := 0, @sectionid := NULL) r

WHERE cm.sectionid = cd.sectionid

ORDER BY cm.sectionid) x

WHERE x.rank <= 20

ORDER BY id

總結

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