The SQL ALTER TABLE statement allows you to rename an existing table.
It can also be used to add, modify, or drop a column from an existing
table.
To add a column to an existing table, the SQL ALTER TABLE syntax is:
SQL ALTER TABLE - Renaming a table
To rename a table, the SQL ALTER TABLE syntax is:ALTER TABLE table_name RENAME TO new_table_name;For example:
ALTER TABLE suppliers RENAME TO vendors;This will rename the suppliers table to vendors.
SQL ALTER TABLE - Adding column(s) to a table
Syntax #1To add a column to an existing table, the SQL ALTER TABLE syntax is:
ALTER TABLE table_name ADD column_name column-definition;For example:
ALTER TABLE supplier ADD supplier_name varchar2(50);This will add a column called supplier_name to the supplier table.