RE: rewriting query without using UNION

From: Rudy Zung <rzung_at_printcafe.com>
Date: Wed, 29 Oct 2003 10:29:48 -0800
Message-ID: <F001.005D4F49.20031029102948@fatcity.com>

select e.ID, e.NAME, d.DEPTNAME

   from EMP e,

        DEPT d
   where e.DEPTNO = d.DEPTNO and

         (e.NAME   = 'JOSE' or
          d.DEPTNO = 50);

-----Original Message-----
Sent: Wednesday, October 29, 2003 12:54 PM To: Multiple recipients of list ORACLE-L

Hi,
I wonder if there's a better way of writing the query below. Basically, I would like to return employee records where employee name='JOSE' + all employees in deptno=50. My query can have multiple 'OR' criterias where the next criteria maybe returning all employees with salary>60000 in addition to

the above two criterias. Building the query with multiple UNIONs will definitely degrade the query performance. Is there a better way of rewriting

the query?

Thanks!

linda

select e.id, e.name, d.deptname from emp e, dept d where e.deptno=d.deptno and e.name='JOSE' union
select e.id, e.name, d.deptname from emp e, dept d where e.deptno=d.deptno and d.deptno=50;

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Author: Linda Wang
  INET: lwang344_at_hotmail.com

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Author: Rudy Zung
  INET: rzung_at_printcafe.com

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To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). Received on Wed Oct 29 2003 - 12:29:48 CST