Get multiple rows from a subquery SQL - sql-server

Question

Basically I have 2 Tables, the first with the raw material amount (QT) for each serial number and the second one with how much raw material was spent (Qt_Added) on batch's production. Like this:
Table 1
+----------+------------+-----+
| Code_Raw | Serial_Raw | Qt |
+----------+------------+-----+
| 1 | 1 | 100 |
| 1 | 2 | 150 |
| 2 | 1 | 80 |
| 1 | 3 | 100 |
+----------+------------+-----+
And Table 2
+------------+----------+------------+----------+--+
| Code_Batch | Code_Raw | Serial_Raw | Qt_Added | |
+------------+----------+------------+----------+--+
| 1 | 1 | 1 | 80 | |
| 2 | 1 | 1 | 10 | |
| 3 | 1 | 2 | 150 | |
| 4 | 1 | 3 | 80 | |
+------------+----------+------------+----------+--+
I tried to do a query for a specific Code_Raw, show me how much left for each serial number, But worked only when there's a single serial_raw.
My query:
select *
from
(select
Serial_Raw,
(Select QT From Table_1 where Code_Raw = 1) - Sum(qt_added) as Total_Remaining
from
Table_2
where
Cod_Raw = 1
group by
Serial_Raw) e
where
Total_Remaining > 0
but it throws this error
Subquery returned more than 1 value. This is not permitted when the subquery follows =, !=, <, <= , >, >= or when the subquery is used as an expression
And I expect :
Serial_Raw Total_Remaining
-------------------------------
1 10
3 20
Is there a struct problem or another way to do this?
I'm using SQL Server 2014
Thanks guys

Answer 1

Try this:
DECLARE #tbl1 TABLE
( CodeRaw INT,
Serial_Raw INT,
Qty INT)
DECLARE #tbl2 TABLE
(
CodeBatch INT,
CodeRaw INT,
Serial_Raw INT,
QtyAdded INT)
INSERT INTO #tbl1 VALUES(1,1,100)
INSERT INTO #tbl1 VALUES(1,2,150)
INSERT INTO #tbl1 VALUES(2,1,80)
INSERT INTO #tbl1 VALUES(1,3,100)
INSERT INTO #tbl2 VALUES(1,1,1,80)
INSERT INTO #tbl2 VALUES(2,1,1,10)
INSERT INTO #tbl2 VALUES(3,1,2,150)
INSERT INTO #tbl2 VALUES(4,1,3,80)
--Inner table has the summary of the Quantity added with columns CodeRaw and SerialRaw. Outer table make join with inner table and just substruct with the Qty and Sum of Qty Added.
SELECT t2.Serial_Raw, t1.Qty - t2.QtyAdded AS Total_Remaining FROM #tbl1 t1
INNER JOIN (SELECT CodeRaw, Serial_Raw , SUM(QtyAdded) QtyAdded FROM #tbl2
GROUP BY CodeRaw, Serial_Raw) AS t2 ON t2.CodeRaw = t1.CodeRaw AND t1.Serial_Raw = t2.Serial_Raw
WHERE t1.Qty - t2.QtyAdded > 0

Answer 2

If I understood you right, this might be what you are after
declare #tbl1 table (CodeRaw INT, Serial_Raw INT, Qty INT)
declare #tbl2 table (CodeBatch INT, CodeRaw INT, Serial_Raw INT, QtyAdded INT)
insert into #tbl1 values (1,1,100), (1,2,150), (2,1,80), (1,3,100)
insert into #tbl2 values (1,1,1,80), (2,1,1,10), (3,1,2,150), (4,1,3,80)
select t2.Serial_Raw,
t3.Qty - sum(t2.QtyAdded) as Total_Remaining
from #tbl2 t2
inner join ( select t1.Serial_Raw,
t1.CodeRaw,
sum(t1.Qty) as Qty
from #tbl1 t1
group by t1.Serial_Raw, t1.CodeRaw
) t3
on t2.Serial_Raw = t3.Serial_Raw
and t2.CodeRaw = t3.CodeRaw
group by t2.Serial_Raw, t3.Qty
So in t2 we get all distinct Serial_Raw values, and sum their QtyAdded from the first table.
In t3 we get all Qty values from the 2nd table.
All we need to do is join them together and subtract
The result of this query is
Serial_Raw Total_Remaining
---------- ---------------
1 10
2 0
3 20