Question

I would like to count The different requests by survey Id’s and grouping it by SubjectValue

I have done this on just the one table with a sub query, but I’m not too sure to do it with several. Could anyone help me out?

This is how the 3 tables are joined. The only values of note are

subjectValue - Table A
Request_Id - Table A
Survey_Id - Table C

SELECT     TableA.SubjectValue
FROM          TableB INNER JOIN
                       TableA ON TableB.ID = TableA.Request_ID INNER JOIN
                       Table C ON TableB.Details_ID = TableC.ID

May I also add that all counts should be returned in the same row.

there are 3 different survey Id’s so the count will need a where clause on the survey_id.

Hope that makes sense.

Many thanks in advance.

Answer 1

You can use generic Cross-tab method

select 
    TableA.SubjectValue,
    SUM(case when somecol='request1' then 1 else 0 end) as request1,
    SUM(case when somecol='request2' then 1 else 0 end) as request2,
    .
TableB INNER JOIN
                       TableA ON TableB.ID = TableA.Request_ID INNER JOIN
                       Table C ON TableB.Details_ID = TableC.ID
group by
    TableA.SubjectValue