If ALTER TABLE contains multiple parts, and one of them creates a problem for a next one, IF NOT EXISTS or IF EXISTS clause in the following one does not work, the statement still produces an error, and does not add the column at all:
MariaDB [test]> show create table t1;
+ -------+---------------------------------------------------------------------------------------+
| Table | Create Table |
+ -------+---------------------------------------------------------------------------------------+
| t1 | CREATE TABLE `t1` (
`i` int (11) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1 |
+ -------+---------------------------------------------------------------------------------------+
1 row in set (0.00 sec)
MariaDB [test]> alter table t1 add column a int , add column if not exists a int ;
ERROR 1060 (42S21): Duplicate column name 'a'
MariaDB [test]> show create table t1;
+ -------+---------------------------------------------------------------------------------------+
| Table | Create Table |
+ -------+---------------------------------------------------------------------------------------+
| t1 | CREATE TABLE `t1` (
`i` int (11) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1 |
+ -------+---------------------------------------------------------------------------------------+
1 row in set (0.00 sec)
Same for DROP COLUMN .
Test case:
create table t1 (i int );
alter table t1 add column a int , add column if not exists a int ;
show create table t1;
revision-id: bar@mariadb.org-20130424142022-u4xhikvoqggze9b0
revno: 3745
branch-nick: 10.0
relates to
MDEV-318
IF (NOT) EXIST clauses for ALTER TABLE (MWL #252)
Closed
made changes -
2013-04-25 16:15
Field
Original Value
New Value
Link
This issue relates to TODO-455
[ TODO-455
]
made changes -
2013-04-25 17:21
Summary
IF NOT EXISTS in multi-action ALTER does not work the problem is created by a previous part of the ALTER
IF NOT EXISTS in multi-action ALTER does not work when the problem is created by a previous part of the ALTER
made changes -
2013-06-04 15:39
Fix Version/s
10.0.4
[ 13101
]
Fix Version/s
10.0.3
[ 12900
]
made changes -
2013-08-16 16:27
Fix Version/s
10.0.5
[ 13201
]
Fix Version/s
10.0.4
[ 13101
]
made changes -
2013-11-05 23:01
Fix Version/s
10.0.6
[ 13202
]
Fix Version/s
10.0.5
[ 13201
]
made changes -
2013-11-18 21:52
Fix Version/s
10.0.7
[ 14100
]
Fix Version/s
10.0.6
[ 13202
]
made changes -
2013-12-28 17:50
Fix Version/s
10.0.8
[ 14200
]
Fix Version/s
10.0.7
[ 14100
]
made changes -
2014-02-10 16:13
Fix Version/s
10.0.9
[ 14400
]
Fix Version/s
10.0.8
[ 14200
]
made changes -
2014-03-09 22:02
Fix Version/s
10.0.10
[ 14500
]
Fix Version/s
10.0.9
[ 14400
]
made changes -
2014-03-31 14:23
Fix Version/s
10.0.11
[ 15200
]
Fix Version/s
10.0.10
[ 14500
]
made changes -
2014-05-10 23:13
Fix Version/s
10.0.12
[ 15201
]
Fix Version/s
10.0.11
[ 15200
]
made changes -
2014-06-03 18:16
Priority
Minor
[ 4
]
Critical
[ 2
]
made changes -
2014-06-09 23:32
Status
Open
[ 1
]
In Progress
[ 3
]
made changes -
2014-06-10 23:52
Resolution
Fixed
[ 1
]
Status
In Progress
[ 3
]
Closed
[ 6
]
made changes -
2014-06-13 15:06
Workflow
defaullt
[ 27233
]
MariaDB v2
[ 42564
]
made changes -
2021-12-06 21:38
Workflow
MariaDB v3
[ 61533
]
MariaDB v4
[ 146633
]
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Bug
Critical
MDEV-318 IF (NOT) EXIST clauses for ALTER TABLE (MWL #252)