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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 ALTER TABLE. Summary: in this tutorial, you will learn how to add a new column, drop a column, modify an existing column, rename an existing column and rename a table using MySQL ALTER TABLE statement.
MySQL ALTER TABLE. Summary: in this tutorial, 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.
ALTER TABLE changes the structure of a table. For example, you can add or delete columns, create or destroy indexes, change the type of existing columns, or rename columns or the table itself. You can also change characteristics such as the storage engine used for the table or the table comment.
In this article, we described how to use the ALTER TABLE statement modify a table, including: adding columns, deleting columns, modifying columns, renaming columns, renaming tables, setting primary keys, etc.
The MySQL ALTER TABLE statement is used to add, modify, or drop/delete columns in a table. The MySQL ALTER TABLE statement is also used to rename a table.
To add an index on column d and a UNIQUE index on column a: ALTER TABLE t2 ADD INDEX (d), ADD UNIQUE (a); To remove column c: ALTER TABLE t2 DROP COLUMN c; To add a new AUTO_INCREMENT integer column named c: ALTER TABLE t2 ADD c INT UNSIGNED NOT NULL AUTO_INCREMENT, ADD PRIMARY KEY (c); We indexed c (as a PRIMARY.
