IN ignore null values

From: Juan Cachito Reyes Pacheco <jreyes_at_dazasoftware.com>
Date: Fri, 20 Feb 2004 10:32:41 -0400
Message-ID: <000501c3f7be$677ae4e0$2501a8c0@dazasoftware.com>

An interesting observation

IN ignore null values as you can see in the table there are 310 null values in column TBL_DSM.

SQL> select count(*) from daz.utl_tablas_me

  2 where tbl_dsm in

  3 (select null from daz.utl_tablas_me);

 COUNT(*)

---

        0

SQL> select count(*) from daz.utl_tablas_me

  2 where exists(select null from daz.utl_tablas_me);

 COUNT(*)

---

      310

---

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Received on Fri Feb 20 2004 - 08:32:41 CST