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`pseudo` varchar(35) NOT NULL default '',
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PRIMARY KEY (`mot`,`pseudo`,`date`,`topic`)
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INSERT INTO t2 (mot,topic,date,pseudo) VALUES ('joce','40143','2002-10-22','joce'), ('joce','43506','2002-10-22','joce');
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select numeropost as a FROM t1 GROUP BY (SELECT 1 FROM t1 HAVING a=1);