Oracle ALTER TABLE StatementIn Oracle, ALTER TABLE statement specifies how to add, modify, drop or delete columns in a table. It is also used to rename a table. How to add column in a tableSyntax: Example: Consider that already existing table customers. Now, add a new column customer_age into the table customers. Now, a new column "customer_age" will be added in customers table. How to add multiple columns in the existing tableSyntax: Example Now, two columns customer_type and customer_address will be added in the table customers. How to modify column of a tableSyntax: Example: Now the column column_name in the customers table is modified to varchar2 (100) and forced the column to not allow null values. How to modify multiple columns of a tableSyntax: Example: This will modify both the customer_name and city columns in the table. How to drop column of a tableSyntax: Example: This will drop the customer_name column from the table. How to rename column of a tableSyntax: Example: This will rename the column customer_name into cname. How to rename tableSyntax: Example: This will rename the customer table into "retailers" table. Next TopicOracle DROP TABLE |