Using exists operator

Oracle Development

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February 11th, 2004, 11:47 AM

gdjsmith

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Using exists operator

I have to use an exists operator to list the course code and title for all courses for which there is someone with qualifications.

SELECT course.course_code, course.course_title
FROM DB519S.course
WHERE exists (SELECT course_code
FROM DB519S.expertise);

The code above is returning too many course_codes. What am I doing wrong?

February 11th, 2004, 12:37 PM

swampBoogie

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Code:

SELECT course.course_code, course.course_title
FROM DB519S.course
WHERE course_code in (SELECT course_code
FROM DB519S.expertise);

February 11th, 2004, 01:51 PM

gdjsmith

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Join Date: Feb 2004

Location: Calgary, Alberta, Canada

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Thanks for the code but the task was to use exists

I think I got it working

Code:

SELECT c.course_code, c.course_title
FROM DB519S.course c
WHERE EXISTS (SELECT e.course_code FROM DB519S.expertise WHERE c.employee_id = e.employee_id)

I know I didn't give the employee_id before but I never thought to use it in the query.

Thanks for your suggestion though!

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