How to add a query to a table in SQL? - sql

Question

I have 3 tables.
For simplicity I changed them to these sample tables.
table1: CorporateActionSmmary
RATE Quantity ProductID
--------------------------
56 0 1487
30 0 1871
40 0 8750
table2# ProductMaster
RATEGROSS ISIN ProductID
--------------------------
60 JP0001 1487
33 JP0002 1871
45 JP0003 8750
table3# OpenPosition
Quantity ProductID
-------------------
5 1487
1 1487
5 1487
3 1871
2 1871
4 8750
2 8750
7 8750
3 8750
First I need to add ISIN from table2 to table1
table1: CorporateActionSmmary
RATE Quantity ProductID ISIN
-------------------------------------
56 0 1487 JP0001
30 0 1871 JP0002
40 0 8750 JP0003
So, I used this code
SELECT [dbo].[CorporateActionSummary].*, [dbo].[ProductMaster].[ISIN]
FROM [dbo].[CorporateActionSummary] JOIN [dbo].[ProductMaster] ON CorporateActionSummary.ProductID = ProductMaster.ProductID
Now as you can see the Quantity is missing in Table1 so I have to add-up all the quantities in Table3 for each product ID and add to Table1(as a new column or over-write the Quntity column)
I think I can get the sum of each ProductID's Quantity by the following code, But how can I add it to Table1 that already has ISIN column
SELECT SUM(Qantity),ProductID
FROM [dbo].[OpenPositions]
I am super new to SQL, please explain in detail if it is possible, thank you
I am using Microsoft SQL Server Management Studio

Answer 1

you can sum the quantities and then join with your query like so:
SELECT CA.*, PM.[ISIN],CA.Quantity
FROM [dbo].[CorporateActionSummary] CA
JOIN [dbo].[ProductMaster] PM
ON CA.ProductID = PM.ProductID
JOIN (
SELECT ProductID, SUM(Qantity) Quantity
FROM [dbo].[OpenPositions]
GROUP BY ProductID
) OO
on OO.ProductID = CA.ProductID

Answer 2

you are almost there.. you just need to use the same logic to join to the product master table. However, since you need the total of quantity, you need to group by the other columns you select (but not aggregate).
The query will be something like this :
SELECT
[dbo].[CorporateActionSummary].ProductID
, [dbo].[ProductMaster].[ISIN]
,sum([OpenPosition].Quantity) as quantity
FROM [dbo].[CorporateActionSummary]
JOIN [dbo].[ProductMaster]
ON CorporateActionSummary.ProductID = ProductMaster.ProductID
JOIN [dbo].[OpenPosition]
ON CorporateActionSummary.ProductID = OpenPosition.ProductID
group by
[dbo].[CorporateActionSummary].ProductID
, [dbo].[ProductMaster].[ISIN]
if you want to add more columns to your select, then you need to group by those colums as well