asked on MS SQL JOIN Syntax
I need help with an SQL Join/results
I have two tables SCHOOLS and STUDENTS They both have a SCHOOLID that can be joined. What I need to see are ALL of the SCHOOLS and fields from the SCHOOLS table and a virtual field telling me if there are ANY STUDENTS that have that SCHOOLID.
Example:
SCHOOLS
SchoolID
School
Active
STUDENTS
name
SchoolID
RESULT Table:
SchoolID Active Used (yes or No)
So the virtual field USED is telling me if there are ANY schools that are in the STUDENTS table.
Then I want to make another query that I can add a where clause to the SchoolID So SAME result be asking "Does SchoolID have any students from the STUDENTS table that have that SchoolID" Then it would list that school (ONE RECORD) SchoolID, School, Active, Used
I have two tables SCHOOLS and STUDENTS They both have a SCHOOLID that can be joined. What I need to see are ALL of the SCHOOLS and fields from the SCHOOLS table and a virtual field telling me if there are ANY STUDENTS that have that SCHOOLID.
Example:
SCHOOLS
SchoolID
School
Active
STUDENTS
name
SchoolID
RESULT Table:
SchoolID Active Used (yes or No)
So the virtual field USED is telling me if there are ANY schools that are in the STUDENTS table.
Then I want to make another query that I can add a where clause to the SchoolID So SAME result be asking "Does SchoolID have any students from the STUDENTS table that have that SchoolID" Then it would list that school (ONE RECORD) SchoolID, School, Active, Used
Microsoft SQL ServerSQL* system SQL queries
Last Comment
Kristen Jones
ASKER
It is a 2008 SQL server so IIF is not a Function I just tried a direct replacement using CASE and it has a lot of other Syntax errors
ASKER
This worked (I had a typo on the field name) But it appears to query all of the students rather than just the SCHOOLS
CASE WHEN Students.SchoolID IS NULL THEN 'Yes' ELSE 'No' end
FROM Schools
LEFT JOIN Students ON Schools.SchoolID = Students.SchoolID;
CASE WHEN Students.SchoolID IS NULL THEN 'Yes' ELSE 'No' end
FROM Schools
LEFT JOIN Students ON Schools.SchoolID = Students.SchoolID;
ASKER
Looking at this again the results are not right. I tried an outer join and it still tries to do a one to many. I just want each school (record) to look through all of the STUDENTS (SchoolD) for it.. if ANY of the STUDENT table has a match .... And there could be 1000's of matches, I just need to know if it was ever used then the single school record say 'Yes' OR 'No' then move to the next record in the SCHOOL table.
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ASKER
It is grabbing and returning all of the Students 1000's there are only about 40 schools so I am expecting only the Schools and either Yes or no on the USED
ASKER
That worked .. thanks!
SELECT Schools.SchoolID, Schools.School, Schools.Active, IIF(Students.SchoolID IS NULL, 'No', 'Yes') AS Used
FROM Schools
LEFT JOIN Students ON Schools.SchoolID = Students.SchoolID;