How can we use MySQL ALTER TABLE command for adding comments on columns?
We can use ‘COMMENT’ keyword with ALTER TABLE command while modifying the column to add comments on columns. For example if we want to add comment in column ‘id’ of table ‘testing’ then following query will do it −
mysql> ALTER TABLE testing MODIFY id INT COMMENT 'id of employees';
Query OK, 0 rows affected (0.07 sec)
Records: 0 Duplicates: 0 Warnings: 0
With following query it can be checked in the comment field of a column.
mysql> Show full columns from testing\G
*************************** 1. row ***************************
Field: id
Type: int(11)
Collation: NULL
Null: NO
Key: PRI
Default: 0
Extra:
Privileges: select,insert,update,references
Comment: id of employees
*************************** 2. row ***************************
Field: Name
Type: varchar(20)
Collation: latin1_swedish_ci
Null: YES
Key:
Default: NULL
Extra:
Privileges: select,insert,update,references
Comment:
2 rows in set (0.05 sec)
Published on 19-Feb-2018 14:32:08
