| NULL ??? [message #10500] |
Mon, 26 January 2004 23:43  |
resy
Messages: 86
Registered: December 2003
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Member |
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hi thanx a lot.
this query is very much suit for my request.
SELECT COUNT(*)
FROM tbsd_prud_params
WHERE UPPER (NVL (prud_value_type, '-NULL')) LIKE 'C%'
AND UPPER (NVL (prud_param_name , '-NULL')) LIKE '%'
AND UPPER (NVL (prud_param_id, '-NULL')) LIKE '%'
/
can u just explain me- how it takes '-NULL'?
thanx again.
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| Re: NULL ??? [message #10507 is a reply to message #10500] |
Tue, 27 January 2004 07:02  |
sverch
Messages: 582
Registered: December 2000
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Senior Member |
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'-NULL' is literal, that substitute NULL value of the column. You will never see it returned by your query because '-NULL' is not LIKE 'C%'
or '%'.
You can check youself by
SELECT NVL(prud_value_type, '-NULL')WHERE
prud_value_type IS NULL;
If you have NULLs in prud_value_type youl'get
-NULL
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