delete from testtable a where (a.testcontent) in (select testcontent from testtable group by testcontent having count(*)>1) and seqid not in (select min(seqid) from testtable group by testcontent having count(*)>1)
delete from testtable a where (a.testcontent) in (select testcontent from testtable group by testcontent having count(*)>1) and seqid not in (select min(seqid) from testtable group by testcontent having count(*)>1)
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