where clause

From: David Boyd <davidb158_at_hotmail.com>
Date: Fri, 06 Feb 2004 14:55:21 -0500
Message-ID: <BAY2-F30IlWrdFOSPUP0003909a@hotmail.com>

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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Received on Fri Feb 06 2004 - 13:55:21 CST