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Re: Finding Orphan Records [message #373114] Wed, 28 March 2001 05:48
kavithask
Messages: 34
Registered: March 2001
Location: London
Member
Hi,

If you use a Sub-query using NOT IN or NOT EXISTS, it should list the rows that are not found in the parent table.

SELECT *
FROM table_b
WHERE col1 NOT IN (
SELECT parent_col1
FROM table_a
);

Or you can use an outerjoin and find the rows which return NULL Values for parent columns.

HTH
Kavitha

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