How to use SET operators?

I am a student in learning ORACLE and just, we covered the SET operators (UNION, UNION ALL, LESS, LESS ALL, INTERSECT). I'm having a very hard time to understand how to use them. We are id list of supervisors of all employees who are not managers of grocery store. Tables:

Table Employee (ID = SUPERVISOR_ID)
-------------
ID
STORE_NUMBER
TITLE (the store manager is one of them)
EMPLOYEE

Store table
----------------
STORE_NUMBER
MANAGER_ID


How to do this using a game operator? Can someone help me please?

Thank you

SELECT id, store_number from employee_table
less
Select manager_id, store_number store_table

http://LRC.surcollege.NET/eBooks/Arabic_Books/Oracle/books/introduction%20To%20Oracle9i_SQL-instructor%20Guide%20Volume%202.PDF
Part 15

Published by: Adigozalov Qurban 5 December 2010 23:16

Published by: Adigozalov Qurban 5 December 2010 23:17

Tags: Database

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