Use of EXISTS in Query..

Dear All,
I have a Query..In that query the below small Sub query is written.. I want to know the use of this query.. This query returns only 1..
Pls help me on this issue.
AND EXISTS (SELECT 1 FROM M_INV_POS_RES IVPR
WHERE IVPR.FAH_ID IN ( SELECT DISTINCT FAH_ID
FROM M_SYS.M_FA_HEADERS
WHERE PROJ_ID = PROJ_ID
AND FAH_CODE = :FAH_CODE
AND RUN_NUMBER =RUN_NUMBER
Thanks
Shabu.

The EXISTS function is true when the subquery returns a row and false when it doesnt return a row.
So, in your sample query, if your subquery returns the value '1', this means that it has retrieve a single/multiple rows, making the EXISTS function true. Otherwise, if your subquery does not return a row, it will not return any value, making your EXISTS function false.
also note that the '1' can also be changed to any static string (i.e. = "X"). This is just used as a flag, determining if the subquery returns a row or not.

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