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CREATE TABLE t1(a INT, b INT); CREATE INDEX IF NOT EXISTS i1 ON t1(a); SHOW CREATE TABLE t1; Table Create Table t1 CREATE TABLE `t1` ( `a` int(11) DEFAULT NULL, `b` int(11) DEFAULT NULL, KEY `i1` (`a`) ) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci DROP INDEX IF EXISTS i1 ON t1; SHOW CREATE TABLE t1; Table Create Table t1 CREATE TABLE `t1` ( `a` int(11) DEFAULT NULL, `b` int(11) DEFAULT NULL ) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci DROP INDEX IF EXISTS i1 ON t1; Warnings: Note 1091 Can't DROP INDEX `i1`; check that it exists SHOW CREATE TABLE t1; Table Create Table t1 CREATE TABLE `t1` ( `a` int(11) DEFAULT NULL, `b` int(11) DEFAULT NULL ) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci CREATE OR REPLACE INDEX i1 ON t1(a); SHOW CREATE TABLE t1; Table Create Table t1 CREATE TABLE `t1` ( `a` int(11) DEFAULT NULL, `b` int(11) DEFAULT NULL, KEY `i1` (`a`) ) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci CREATE OR REPLACE INDEX i1 ON t1(a,b); SHOW CREATE TABLE t1; Table Create Table t1 CREATE TABLE `t1` ( `a` int(11) DEFAULT NULL, `b` int(11) DEFAULT NULL, KEY `i1` (`a`,`b`) ) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci DROP TABLE t1; CREATE OR REPLACE INDEX IF NOT EXISTS i1 ON t1(b,a); ERROR HY000: Incorrect usage of OR REPLACE and IF NOT EXISTS