SELECT aaa,(@rowNum:=@rowNum+1) AS rowNo
FROM tb_bbb,
(SELECT (@rowNum :=0) ) b
ORDER BY tb_bbb.liushuihao DESC
SELECT aaa,(@rowNum:=@rowNum+1) AS rowNo
FROM tb_bbb,
(SELECT (@rowNum :=0) ) b
ORDER BY tb_bbb.liushuihao DESC
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