191
225
id select_type table type possible_keys key key_len ref rows Extra
192
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1 SIMPLE t1 ref id id 4 const 1 Using index
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CREATE TABLE t1 (numeropost int NOT NULL default '0', numreponse int NOT NULL auto_increment, PRIMARY KEY (numeropost,numreponse), UNIQUE KEY numreponse (numreponse));
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CREATE TABLE t1 (numeropost mediumint(8) unsigned NOT NULL default '0', numreponse int(10) unsigned NOT NULL auto_increment, PRIMARY KEY (numeropost,numreponse), UNIQUE KEY numreponse (numreponse));
195
229
INSERT INTO t1 (numeropost,numreponse) VALUES ('1','1'),('1','2'),('2','3'),('2','4');
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SELECT numeropost FROM t1 WHERE numreponse='1';