Mysql alter table add multiple columns
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Alter table modify column mysql.
In the process of using the table, if you need to modify the table, you can use the statement. With the statement, you can rename tables, rename columns, add columns, drop columns, modify column properties, etc.
ALTER TABLE syntax
The is a modification action, and it may be:
The keyword can be used to add columns, indexes, constraints, etc., including:
- : add a column
- : add a index
- : add a primary key constrain
- : add a foreign key constrain
- : add a unique index
- : add a check constraint
The keyword can be used to drop columns, indexes, constraints, etc., including:
- : delete a column
- : drop a index
- : delete the primary key constrain
- : delete a foreign key constrain
- : remove check constraint
The keyword is used to modify the definition of a column.
Unlike the keyword, it cannot rename columns.
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The keyword is used to modify the definition of a column. Unlike the keyword, it can rename columns. For example: .
The keyword is used to rename columns, indexes, and tables. include:
- : Rename a column.
- : Rename a index.
- : Rename a table.
For example: .