How to combine records from different table into one record set with count

Question

I have the following code

SELECT 
    dbo.tbl1.RecId, dbo.tbl1.CertType, 
    COUNT(dbo.tbl2.CertType) AS   Quantity
FROM 
    dbo.tbl3 
INNER JOIN
    dbo.tbl2 ON dbo.tbl3.RequestNo = dbo.tbl2.RequestNo 
RIGHT OUTER JOIN
    dbo.tbl1 ON dbo.tbl2.CertType = dbo.tbl1.RecId
GROUP BY 
    dbo.tbl1.RecId, dbo.tbl1.CertType

And it returns this result:

RecId CertType   Quantity
1     Clearance         4
2     Permit            0

It only counts the quantity from tbl3 but I want it to count also the records from tbl4 but just don't know how to add code for it.

Note: tbl4 has the same format with tlb3 . thanks for your help.

I want the result just like this:

RecId CertType   Quantity
1     Clearance         4
2     Permit            2

Answer 1

In this case the over clause would be useful. There is an example in the appropriate section in the MSDN page that uses the count command. Your case should become something like:

SELECT 
    t.RecId, t.CertType, 
    COUNT(t.CertType) over (partition by t.RecId) AS   Quantity
FROM 
    (SELECT   dbo.tbl1.RecId, dbo.tbl1.CertType
     FROM 
         dbo.tbl3 
         INNER JOIN dbo.tbl2 ON dbo.tbl3.RequestNo = dbo.tbl2.RequestNo
         RIGHT OUTER JOIN dbo.tbl1 ON dbo.tbl2.CertType = dbo.tblBasicPermitFeeSchedule.RecId
     UNION
     SELECT   dbo.tbl1.RecId, dbo.tbl1.CertType
     FROM         
         dbo.tbl4 
         INNER JOIN dbo.tbl2 ON dbo.tbl4.RequestNo = dbo.tblRequests.RequestNo
         RIGHT OUTER JOIN dbo.tbl1 ON dbo.tbl2.CertType = dbo.tbl1.RecId) t
GROUP BY 
    t.RecId, t.CertType

or something similar. I haven't tested it yet though, so it could be a bit different.

Let me know if something is unclear.

Answer 2

I think i got this solution that works for me.

SELECT   dbo.tbl1.RecId, dbo.tbl1.CertType, 
COUNT(dbo.tbl2.RequestNo)  AS   Quantity
FROM         dbo.tbl3 INNER JOIN 
         dbo.tbl2 ON dbo.tbl3.RequestNo = dbo.tbl2.RequestNo
         RIGHT OUTER JOIN
         dbo.tbl1 ON dbo.tbl2.CertType = dbo.tblBasicPermitFeeSchedule.RecId                                          

 GROUP BY dbo.tbl1.RecId, dbo.tbl1.CertType

UNION
SELECT   dbo.tbl1.RecId, dbo.tbl1.CertType, 
COUNT(dbo.tbl2.RequestNo)  AS   Quantity
FROM         dbo.tbl4 INNER JOIN 
         dbo.tbl2 ON dbo.tbl4.RequestNo = dbo.tblRequests.RequestNo
         RIGHT OUTER JOIN
         dbo.tbl1 ON dbo.tbl2.CertType = dbo.tbl1.RecId                                          

 GROUP BY dbo.tbl1.RecId, dbo.tbl1.CertType

Thanks for all your ideas.