What is ALTER TABLE?

What is ALTER in database?

ALTER DATABASE enables you to change the overall characteristics of a database. These characteristics are stored in the data dictionary. This statement requires the ALTER privilege on the database. ALTER SCHEMA is a synonym for ALTER DATABASE .

How do you use ALTER tables?

The basic syntax of an ALTER TABLE command to change the DATA TYPE of a column in a table is as follows. ALTER TABLE table_name MODIFY COLUMN column_name datatype; The basic syntax of an ALTER TABLE command to add a NOT NULL constraint to a column in a table is as follows.

What is the difference between ALTER TABLE and update table?

ALTER Command is used to add, delete, modify the attributes of the relations (tables) in the database. UPDATE Command is used to update existing records in a database.

What is ALTER TABLE in Python?

The ALTER statement changes the structure or schema of an already created database table by adding or removing one or more columns. The ALTER statement can be used to change several other attributes of the tables such as the name of the table and name of the columns.