SQL Alter Table

What is alter table statement in sql? Can u please show me an example of SQL Alter Table??

Thanks!

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December 27, 2010 at 12:14 AM

ALTER TABLE Statement: It allows to rename the existing table. Apart from it... the statement can also be used to modifiy, add or deleate a column in the existing table.

SQL Alter Table Query Syntax:

- Rename Table: 

ALTER TABLE suppliers
 RENAME TO vendors;

- Add Column
ALTER TABLE supplier
ADD (   supplier_name   varchar2(50),
    city    varchar2(45) );

- Modifiy Column
ALTER TABLE supplier
MODIFY (    supplier_name   varchar2(100)   not null,
    city    varchar2(75)        );

- Drop Column
ALTER TABLE supplier
 DROP COLUMN supplier_name;

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