MySQL Database Management System > MySQL Statements and Clauses

MySQL - Alter Table Statement

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To add, delete, or edit columns in an existing table, use the ALTER TABLE statement. The ALTER TABLE statement can also be used to add and remove constraints from a table.

When you wish to modify the name of your table or any table field, you use the ALTER statement in MySQL. It can also be used to add or remove columns from a table. Depending on the situation, the ALTER statement is always used with the "ADD," "DROP," and "MODIFY" commands.

ALTER TABLE Work:

  • COPY. Operations are performed on a copy of the original table, and table data is copied from the original table to the new table row by row.
  • INPLACE. Operations avoid copying table data but may rebuild the table in place.
  • INSTANT. Operations only modify metadata in the data dictionary.

A table's columns and indexes can be added or modified, the engine can be changed, foreign keys can be added, and the table name can be changed. Right-click a table name in the Navigator area of the sidebar with the Schemas secondary tab selected and select Alter Table to open the MySQL Table Editor.

The MySQL SELECT statement searches the database for rows/columns that match the criteria specified by the operator and returns them. Database administrators can retrieve, group, summarise, and analyse data using this MySQL query data method.

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