Oracle-L: SQL Query

From: Bellow, Bambi <bbellow_at_chi.navtech.com>
Date: Fri, 14 Nov 2003 09:44:26 -0800
Message-ID: <F001.005D6AF6.20031114094426@fatcity.com>

Friends --

Why would these two queries return different results?

This query works.

SQL> l
1 select
a.tablespace_name,megs_allocated,megs_used,round(megs_used/b.megs_allocated, 2)*100 pct
2 from (select tablespace_name,sum(bytes)/(1024*1024) megs_used 3 from dba_extents group by tablespace_name) a, 4 (select tablespace_name,sum(bytes)/(1024*1024) megs_allocated 5 from dba_data_files group by tablespace_name) b 6 where a.tablespace_name=b.tablespace_name 7* and a.tablespace_name='NAUAT'
SQL> /

TABLESPACE_NAME                MEGS_ALLOCATED  MEGS_USED        PCT
------------------------------ -------------- ---------- ----------
NAUAT                                22924.25      11509         50

This query does not work

1 select a.tablespace_name,sum(b.bytes)/(1024*1024) megs_allocated, 2 sum(a.bytes)/(1024*1024) megs_used, 3 round(sum(a.bytes)/sum(b.bytes),4)*100 pct 4 from dba_extents a, dba_data_files b 5 where a.tablespace_name=b.tablespace_name 6 and a.tablespace_name='NAUAT'
7* group by a.tablespace_name,b.tablespace_name SQL> /

TABLESPACE_NAME                MEGS_ALLOCATED  MEGS_USED        PCT
------------------------------ -------------- ---------- ----------
NAUAT                              31773010.5      23018        .07

Bambi.
--

Please see the official ORACLE-L FAQ: http://www.orafaq.net
--

Author: Bellow, Bambi
INET: bbellow_at_chi.navtech.com

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