Details
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Bug
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Status: Open (View Workflow)
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Trivial
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Resolution: Unresolved
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10.2, 10.3, 10.4, 10.5, 10.6, 10.7
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None
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None
Description
MariaDB syntax allows any combination of UNIQUE and primary key.
And if both are present in that column definition, then only primary key index is created:
MariaDB [test]> CREATE or replace TABLE t1 ( i INT primary key UNIQUE UNIQUE UNIQUE primary key unique );
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Query OK, 0 rows affected (0.09 sec)
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MariaDB [test]> show create table t1;
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+-------+--------------------------------------------------------------------------------------------------------+
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| Table | Create Table |
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+-------+--------------------------------------------------------------------------------------------------------+
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| t1 | CREATE TABLE `t1` (
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`i` int(11) NOT NULL,
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PRIMARY KEY (`i`)
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) ENGINE=InnoDB DEFAULT CHARSET=latin1 |
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+-------+--------------------------------------------------------------------------------------------------------+
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1 row in set (0.00 sec)
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MariaDB [test]> CREATE or replace TABLE t1 ( i INT UNIQUE UNIQUE UNIQUE);
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Query OK, 0 rows affected (0.10 sec)
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MariaDB [test]> show create table t1;
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+-------+---------------------------------------------------------------------------------------------------------------+
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| Table | Create Table |
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+-------+---------------------------------------------------------------------------------------------------------------+
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| t1 | CREATE TABLE `t1` (
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`i` int(11) DEFAULT NULL,
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UNIQUE KEY `i` (`i`)
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) ENGINE=InnoDB DEFAULT CHARSET=latin1 |
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+-------+---------------------------------------------------------------------------------------------------------------+
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1 row in set (0.00 sec)
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mysql 5.6-8.0 creates in such case both unique + primary indexes:
CREATE TABLE `t1` ( `i` int(11) NOT NULL, PRIMARY KEY (`i`), UNIQUE KEY `i` (`i`) ) ENGINE=InnoDB
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