Topic: SQL*Plus and PL/SQL >> Can I avoid repetition in NVL?
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| Title: Can I avoid repetition in NVL? |
| shake |
Posted: Jul 03, 2009 06:56:41 AM |
Total Post: 96
Joined: Jun, 2008
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Can someone suggest any solution for avoiding the same query get repeated inside an NVL statement?.
To be more specific, consider this piece in a query.
SELECT MEM.MEM_ID,
NVL(
(SELECT PAY.DUE_AMOUNT FROM T_MST_PAYMENTS PAY
WHERE PAY.PAYEE_ID=MEM.MEM_ID),
null, 0,
(SELECT PAY.DUE_AMOUNT FROM T_MST_PAYMENTS PAY
WHERE PAY.PAYEE_ID=MEM.MEM_ID)
)
FROM T_MST_MEMBERS MEM
WHERE
...
...
Here, in this query I'm calculating if the due amount is null; if so then I display 0; but if it is not, the default value which is fetched by the query is displayed.
Now, I want to know how I can avoid repeating the same query second time but I need to display the actual value in case non-null value is returned.
Suggest a solution... This tortures me a lot when I handle big subqueries inside a NVL. |
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 Babu |
| Posted: Jul 10, 2009 05:43:31 AM |  |
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Total Post: 98
Joined: Oct, 2007
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Yout answer or still locking?
Babu
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| Vish |
| Posted: Jul 15, 2009 02:29:49 PM | |
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Total Post: 320
Joined: Jan, 2007
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| Time Zone: EDT |
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