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How to rearrange MySQL columns?
To rearrange the MySQL columns, check the column arrangement with the help of show create command. The syntax is as follows −
show create table yourTableName;
The syntax to rearrange the MySQL columns is as follows −
alter table yourTableName change column yourColumnName yourColumnName dataType first
For the same purpose, you can use the after keyword. The syntax is as follows −
alter table yourTableName change column yourColumnName yourColumnName dataType after yourSpecificColumnName;
Let us first check the column arrangement for the already created table “AddColumn” −
mysql> show create table AddColumn;
The following is the output −
+-----------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | Table | Create Table | +-----------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | AddColumn | CREATE TABLE `addcolumn` (`StudentId` varchar(50) DEFAULT NULL, `StudentName` varchar(300) DEFAULT NULL ) ENGINE = InnoDB DEFAULT CHARSET = utf8mb4 COLLATE = utf8mb4_0900_ai_ci| +-----------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ 1 row in set (0.00 sec)
Now you can rearrange the StudentName column before StudentId. The query is as follows −
mysql> alter table AddColumn change StudentName StudentName varchar(300) first; Query OK, 0 rows affected (1.28 sec) Records: 0 Duplicates: 0 Warnings: 0
Here is the query that can be used to check the StudentName is first column or not −
mysql> desc AddColumn;
The following is the output displaying that the columns are successfully rearranged −
+-------------+--------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +-------------+--------------+------+-----+---------+-------+ | StudentName | varchar(300) | YES | | NULL | | | StudentId | varchar(50) | YES | | NULL | | +-------------+--------------+------+-----+---------+-------+ 2 rows in set (0.00 sec)
Updated on: 30-Jul-2019
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