What can ALTER TABLE clause do?

What can be done using alter?

The most commonly used Alter operations are Add, Drop, Modify, change commands for adding, deleting, or changing the contents of the table or column. ALTER command can be used to add columns to an existing table, drop a column from a table, rename an existing column, and change the data type of a column.

Which clause is used with the ALTER TABLE statement?

The ALTER TABLE statement allows you to perform the following operations on an existing table: Add a new column using the ADD clause. Modify attribute of a column such as constraint, default value, etc.

Can ALTER TABLE change data type?

SQL query to change the column type in PostgreSQL database We can use ALTER TABLE ALTER COLUMN statement to change the datatype of the column. The syntax to change the datatype of the column is the following. In the syntax, Tbl_name: Specify the table name that contains the column that you want to change.