Question

I’m trying to do a full join on two SQL queries, below:

1st Query:

SELECT
    ID
    ,SUM(CASE WHEN reason = 4 THEN 0 ELSE quantity*price END) AS TValue
    ,COUNT(*) AS CountAll
FROM table1
WHERE Date>=@StartDate AND Date<=@EndDate
GROUP BY ID

2nd Query:

SELECT
    ID
    ,SUM(CASE WHEN reason = 1 THEN 1 ELSE 0 END) AS New
    ,SUM(CASE WHEN reason = 6 THEN 1 ELSE 0 END) AS Amend
    ,SUM(CASE WHEN reason = 5 THEN 1 ELSE 0 END) AS Cancel
FROM Table2
WHERE Date2 >=@StartDate AND Date2<= @EndDate
GROUP BY ID

Result from query1

ID   CountAll     TValue    
-------------------------
id1     24         1020      
id2     13         2030      
id3      4          120    

Result from query 2:

ID     New     Amend     Cancel
--------------------------------
id1    12         4         6
id2     7         6         1
id4     2         1         2

Needed output:

ID     TValue     CountAll     New    Amend    Cancel   Total(countall+new+amend+cancel)
----------------------------------------------------------------------------------------
Id1    1020          24        12       4         6        46
Id2    2030          13         7       6         1        27
id3     120           4         0       0         0         4
Id4       0           0         2       1         2         5

I’ll post my current solution if requested, but it is pretty far from working.

I’ve been doing a bit of research and I think I need to either make a union to join the ID’S, or just do a Full Join. (Second day ever doing sql)

Answer 1

I would write something like below:

select decode (a.id, null, b.id, a.id) as ID, a.TValue, CountAll, b.new, b.Amend, b.cancel 
   from (SELECT ID ,SUM(CASE WHEN reason = 4 THEN 0 ELSE quantity*price END) 
         AS TValue ,COUNT(*) AS CountAll 
         FROM table1 
         WHERE Date>=@StartDate AND Date<=@EndDate GROUP BY ID
        ) a FULL OUTER JOIN
        (SELECT ID , SUM(CASE WHEN reason = 1 THEN 1 ELSE 0 END) 
            AS New ,SUM(CASE WHEN reason = 6               
            THEN 1 ELSE 0 END) AS Amend , 
            SUM(CASE WHEN reason = 5 THEN 1 ELSE 0 END) AS Cancel
            FROM Table2 WHERE Date2 >=@StartDate AND Date2<= @EndDate GROUP BY ID
        ) b
     on a.id = b.id