Re: where clause

From: Shamita Singh <shamita_s_at_yahoo.com>
Date: Fri, 6 Feb 2004 12:01:19 -0800 (PST)
Message-ID: <20040206200119.72015.qmail@web14009.mail.yahoo.com>

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_at_hotmail.com> 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(*)

SQL> SELECT COUNT(*) FROM test WHERE status_flag ='S';

COUNT(*)

SQL> SELECT COUNT(*) FROM test WHERE status_flag !='A';

COUNT(*)

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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Received on Fri Feb 06 2004 - 14:01:19 CST