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First, provide the table name to which you want to add a new column after the ALTER TABLE clause. Second, define the new column and its attributes after the ADD COLUMN clause. Note that COLUMN keyword is optional so you can omit it. Third, specify the position of the new column in the table.
- MySQL ALTER TABLE
You will learn how to use the MySQL ALTER TABLE statement to...
- MySQL ALTER TABLE
The ALTER TABLE statement is used to add, delete, or modify columns in an existing table. The ALTER TABLE statement is also used to add and drop various constraints on an existing table. ALTER TABLE - ADD Column. To add a column in a table, use the following syntax: ALTER TABLE table_name. ADD column_name datatype;
MySQL allows us to add a column to an existing table using the MySQL ALTER TABLE ADD COLUMN statement. You can also add more than one column to a table using the MySQL ADD COLUMN statement.
You will learn how to use the MySQL ALTER TABLE statement to add a column, alter a column, rename a column, drop a column and rename a table.
Table Options. table_options signifies table options of the kind that can be used in the CREATE TABLE statement, such as ENGINE, AUTO_INCREMENT, AVG_ROW_LENGTH, MAX_ROWS, ROW_FORMAT, or TABLESPACE.. For descriptions of all table options, see Section 15.1.20, “CREATE TABLE Statement”.However, ALTER TABLE ignores DATA DIRECTORY and INDEX DIRECTORY when given as table options.
Learn how to add new columns to MySQL tables using the ALTER TABLE command, with examples on setting default values and constraints.
This MySQL tutorial explains how to use the MySQL ALTER TABLE statement to add a column, modify a column, drop a column, rename a column or rename a table (with syntax and examples).
