rewriting query without using UNION

From: Linda Wang <lwang344_at_hotmail.com>
Date: Wed, 29 Oct 2003 09:54:26 -0800
Message-ID: <F001.005D4F3D.20031029095426@fatcity.com>

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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