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44 lines
1.6 KiB
Text
44 lines
1.6 KiB
Text
CREATE TABLE t1 (D INT) ENGINE=innodb;
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INSERT INTO t1 VALUES (10);
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ALTER TABLE t1 MODIFY COLUMN d INT;
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ALTER TABLE t1 ADD INDEX my_d (d);
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SHOW CREATE TABLE t1;
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Table Create Table
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t1 CREATE TABLE `t1` (
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`d` int(11) DEFAULT NULL,
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KEY `my_d` (`d`)
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) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
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INSERT INTO t1 VALUES (1),(2),(3),(4),(5),(6),(7),(8),(9);
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INSERT INTO t1 SELECT * FROM t1;
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INSERT INTO t1 SELECT * FROM t1;
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INSERT INTO t1 SELECT * FROM t1;
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INSERT INTO t1 SELECT * FROM t1;
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INSERT INTO t1 SELECT * FROM t1;
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INSERT INTO t1 SELECT * FROM t1;
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INSERT INTO t1 SELECT * FROM t1;
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EXPLAIN SELECT d FROM t1 WHERE d = 5;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref my_d my_d 5 const 128 Using index
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EXPLAIN SELECT D FROM t1 WHERE D = 5;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref my_d my_d 5 const 128 Using index
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ALTER TABLE t1 DROP INDEX my_d;
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ALTER TABLE t1 MODIFY COLUMN D INT;
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ANALYZE TABLE t1;
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Table Op Msg_type Msg_text
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test.t1 analyze status Engine-independent statistics collected
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test.t1 analyze status OK
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ALTER TABLE t1 ADD INDEX my_d (D);
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EXPLAIN SELECT d FROM t1 WHERE d = 5;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref my_d my_d 5 const 128 Using index
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EXPLAIN SELECT D FROM t1 WHERE D = 5;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref my_d my_d 5 const 128 Using index
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SHOW CREATE TABLE t1;
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Table Create Table
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t1 CREATE TABLE `t1` (
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`D` int(11) DEFAULT NULL,
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KEY `my_d` (`D`)
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) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
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DROP TABLE t1;
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