How to add column in existing table ,this column is nothing but each rows here is object of other table

Can anyone explain to m开发者_StackOverflow社区e how to add a column in an existing table where the datatype for this column is object?

Also tell me how to insert and retrieve the data.

Thanks

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Setup:

CREATE TABLE table1 (col1 varchar2(10));
CREATE OR REPLACE TYPE mytype authid definer AS OBJECT 
( 
  thing1 varchar2(10),
  thing2 date
);

Answer:

ALTER TABLE table1 ADD col2 mytype;
INSERT INTO table1 VALUES ('a', mytype('A',sysdate));
SELECT col1, t.col2.thing1, t.col2.thing2 FROM table1 t;

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ALTER TABLE mytable ADD COLUMN (mynewcol NUMBER);

INSERT INTO mytable (col1, col2, col3, ...) VALUES (1, 'blah', SysDate, ...)

SELECT *
  FROM mytable;