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MySQL
Usage
Alter table
Add a column to a table
We can add a column to a table with a specified order with the keyword
FIRST
to the front of all columns or
AFTER `exist_column_name`
to after the column
`exist_column_name`
.
ALTER
TABLE
`
table_name
`
ADD
COLUMN
`
new_column_name
`
VARCHAR
(
255
)
NOT
NULL
DEFAULT
''
COMMENT
'some_comments'
AFTER
`
exist_column_name
`
;
Change the data type of a column
ALTER
TABLE
`
table_name
`
MODIFY
COLUMN
`
exist_column_name
`
VARCHAR
(
255
)
NOT
NULL
DEFAULT
''
COMMENT
'some_comments'
;
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Last modified
4mo ago
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Usage
Alter table