Sum values are inflated when I join another table - sql

Question

I have two queries that return the result sets I want, it is one row per user per day. The problem is that when I try to join the two queries, by userid, I get inflated results because the user is in the table multiple times for each day. How do I join them and avoid having the inflated results?
**Query 1**
SELECT AAL.UserID
, SUM(AAL.Dur)/60 AS 'LIM'
, SUM(CASE When AAL.DUR = 'av' then AAL.Dur/60
Else 0 END) AS 'AVAIL'
FROM WG
INNER JOIN AAL
on WG.UserID=AAL.UserID
and WG.SiteID=AAL.SiteID
WHERE WG.WG = 'OP'
AND DATEDIFF(day,AAL.Date,GETDATE()) = 1
GROUP BY AAL.UserID
**Query 2**
SELECT R.UserID
, SUM(CASE When R.StID = 4 then 1
Else 0 End) AS 'Rf Ct'
FROM R
INNER JOIN WG
on R.UserID = WG.UserID
WHERE WG.WG = 'OP'
AND DATEDIFF(day,R.Date,GETDATE()) = 1
GROUP BY R.UserID
**JOIN ATTEMPT**
SELECT AAL.UserID
, SUM(AAL.Dur)/60 AS 'LIM'
, SUM(CASE When AAL.DUR = 'av' then AAL.Dur/60
Else 0 END) AS 'AVAIL'
, SUM(CASE When R.StID = 4 then 1
Else 0 End) AS 'Rf Ct'
FROM WG
INNER JOIN AAL
on WG.UserID=AAL.UserID
and WG.SiteID=AAL.SiteID
INNER JOIN R
on AAL.UserID=R.UserID
WHERE WG.WG = 'OP'
AND DATEDIFF(day,AAL.Date,GETDATE()) = 1
GROUP BY AAL.UserID

Answer 1

You are not using WB in the query. So, just use exists or in:
SELECT R.UserID, SUM(CASE When R.StID = 4 then 1 Else 0 End) AS 'Rf Ct'
FROM R
WHERE DATEDIFF(day, R.Date, GETDATE()) = 1 AND
EXISTS (SELECT 1 FROM WB WHERE R.UserID = WG.UserID AND WG.WG = 'OP')
GROUP BY R.UserID;
You should understand the reason why the number gets multiplied -- multiple rows in WG correspond to a single R.ID.