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SQL Minus Query

Posted on 2004-09-20
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Last Modified: 2012-08-13
I am looking for a solution that would be similar to Oracle's minus query.  I have two tables, an employee table and an employee_skill table.  I need a query that will pull out all employees that do not have a certain skill.

example:  Select * from employee, employee_skill
               where employee.empid = employee_skill.empid

               MINUS
 
               Select * from employee, employee_skill
               where employee.empid = employee_skill.empid
               and skill_id = 2 //or whatever skill#
             
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Question by:d_vonfeldt
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Expert Comment

by:GRayL
ID: 12106204
Select * from employee, employee_skill inner join employee.empid = employee_skill.empid where employee_skill <> 2;
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Accepted Solution

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shanesuebsahakarn earned 800 total points
ID: 12106282
SELECT * FROM employee WHERE empid NOT IN (SELECT empid FROM employee_skill As A WHERE A.skill_id=2 AND A.empid=employee.empid)
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Author Comment

by:d_vonfeldt
ID: 12106284
Select * from employee, employee_skill inner join employee.empid = employee_skill.empid where employee_skill <> 2;

that line of code gave me a syntax error in FROM clause message.

Is that line equivalent to: Select * from employee, employee_skill
                                    where employee.empid = employee_skill.empid
                                    and skill_id <> 2.

I am not too familiar with inner joins?
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Author Comment

by:d_vonfeldt
ID: 12106353
Thanks,

That was quick and easy.
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Expert Comment

by:GRayL
ID: 12106412
Sorry, I got it wrong. For the record, I think it should be:

Select * from employee inner join employee.empid = employee_skill.empid where employee_skill <> 2;
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Expert Comment

by:GRayL
ID: 12106424
Still got it wrong:

Select * from employee inner join employee.empid = employee_skill.empid where employee_skill.skill_id <> 2;
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LVL 41

Expert Comment

by:shanesuebsahakarn
ID: 12106476
GRayL, you have not specified the join table in your query. It should read (modifications in caps):

Select EMPLOYEE.* from employee inner join EMPLOYEE_SKILL ON employee.empid = employee_skill.empid where employee_skill.skill_id <> 2;

However, this only returns records where the skill_id is not 2 - if an employee has skill 2, it simply doesn't include that record in the list, but includes all of his other skill records. It doesn't return records for employees who don't have skill 2 at all.
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Author Comment

by:d_vonfeldt
ID: 12106489
I am still getting the same error when using

Select * from employee inner join employee.empid = employee_skill.empid where employee_skill.skill_id <> 2;
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Author Comment

by:d_vonfeldt
ID: 12106513
perfect explanation shanesuebsahkarn,  that is what was giving me the troubles.

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Expert Comment

by:GRayL
ID: 12106666
Nicely done Shane.
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