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| --------------
SET AUTOCOMMIT = 0
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START TRANSACTION
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DROP DATABASE IF EXISTS `base`
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CREATE DATABASE IF NOT EXISTS `base`
DEFAULT CHARACTER SET `latin1`
DEFAULT COLLATE `latin1_general_ci`
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DROP TABLE IF EXISTS `test`
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CREATE TABLE `test` (
`col1` int UNSIGNED NOT NULL primary key,
`col2` int UNSIGNED NOT NULL
) ENGINE=InnoDB
DEFAULT CHARSET=`latin1` COLLATE=`latin1_general_ci`
ROW_FORMAT=COMPRESSED
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INSERT INTO `test` (`col1`,`col2`) value (2,1),(1,3),(3,2)
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select * from test
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+------+------+
| col1 | col2 |
+------+------+
| 1 | 3 |
| 2 | 1 |
| 3 | 2 |
+------+------+
--------------
describe `test`
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+-------+------------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-------+------------------+------+-----+---------+-------+
| col1 | int(10) unsigned | NO | PRI | NULL | |
| col2 | int(10) unsigned | NO | | NULL | |
+-------+------------------+------+-----+---------+-------+
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truncate `test`
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alter table `test` drop primary key
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INSERT INTO `test` (`col1`,`col2`) value (2,1),(1,3),(3,2)
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select * from test
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+------+------+
| col1 | col2 |
+------+------+
| 2 | 1 |
| 1 | 3 |
| 3 | 2 |
+------+------+
--------------
describe `test`
--------------
+-------+------------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-------+------------------+------+-----+---------+-------+
| col1 | int(10) unsigned | NO | | NULL | |
| col2 | int(10) unsigned | NO | | NULL | |
+-------+------------------+------+-----+---------+-------+
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truncate `test`
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alter table `test` add unique index (`col2`)
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INSERT INTO `test` (`col1`,`col2`) value (2,1),(1,3),(3,2)
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select * from test
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+------+------+
| col1 | col2 |
+------+------+
| 2 | 1 |
| 3 | 2 |
| 1 | 3 |
+------+------+
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describe `test`
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+-------+------------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-------+------------------+------+-----+---------+-------+
| col1 | int(10) unsigned | NO | | NULL | |
| col2 | int(10) unsigned | NO | PRI | NULL | |
+-------+------------------+------+-----+---------+-------+
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COMMIT
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SET AUTOCOMMIT = 1
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