去除term重複的記錄：
DELETE FROM tag WHERE id IN
(SELECT id FROM (SELECT MIN(id) AS id,COUNT(term) AS COUNT FROM tag GROUP BY term
HAVING COUNT >1 ORDER BY COUNT DESC) AS tab )
mysql 去除重複記錄
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去除term重複的記錄：
DELETE FROM tag WHERE id IN
(SELECT id FROM (SELECT MIN(id) AS id,COUNT(term) AS COUNT FROM tag GROUP BY term
HAVING COUNT >1 ORDER BY COUNT DESC) AS tab )