--其实就是一个子查询SELECT classID, class_nameCN, class_nameEN, topclassid
,(SELECT COUNT(topclassid) FROM full_class WHERE topclassid=a.classID) AS COU
FROM full_class a
WHERE (topclassid = 0)
,(SELECT COUNT(topclassid) FROM full_class WHERE topclassid=a.classID) AS COU
FROM full_class a
WHERE (topclassid = 0)
解决方案 »
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