Re: where clause
- From: Shamita Singh <shamita_s@xxxxxxxxx>
- To: oracle-l@xxxxxxxxxxxxx
- Date: Fri, 6 Feb 2004 12:01:19 -0800 (PST)
You need to use NVL. For example, NVL(status_flag,'X') != 'A' where 'X' is any
value other than 'A'. It does not recognise the null values.
Regards,
Shamita
David Boyd <davidb158@xxxxxxxxxxx> wrote:
Hi List,
I found following results that I don't understand.
SQL> desc test
Name Null? Type
----------------------------------------- -------- -----------------
STATUS_FLAG CHAR(1)
SQL> SELECT COUNT(*) FROM test;
COUNT(*)
----------
1681
SQL> SELECT COUNT(*) FROM test WHERE status_flag IS NULL;
COUNT(*)
----------
1638
SQL> SELECT COUNT(*) FROM test WHERE status_flag ='A';
COUNT(*)
----------
5
SQL> SELECT COUNT(*) FROM test WHERE status_flag ='S';
COUNT(*)
----------
38
SQL> SELECT COUNT(*) FROM test WHERE status_flag !='A';
COUNT(*)
----------
38
I thought the last query should return 1676 (status_flag ='S' + status_flag
is null) instead of 38 (status_flag ='S' only). Any ideas???
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Shamita
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