Guide me to solve SQL query.

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I have two table : TABLE A and TABLE B. The structure of both tables given below
TABLE A

DOCNO VENDOR
1 X
1
1
2 Y
2
2
3
3 Z
3

TABLE B
DOC VALUE
1 100
2 200
3 300
Here in both table DOCNO and DOC are primary Key. I need output using SQL query given below:
DOCNO VENDOR DOC VALUE
1 X 1 100
1 X 1 100
1 X 1 100
2 Y 2 200
2 Y 2 200
2 Y 2 200
3 Z 3 300
3 Z 3 300
3 Z 3 300

What I have tried:

select DOC_No,Vendor,DOC,
CASE when (a.Vendor <> '' and a.DOC_No = a.DOC) then
a.Vendor 
ELSE  '0'
end
from
(
select a.DOC_No , a.Vendor,b.Doc,b.Val from [dbo].[Vendor_Table]a
INNER JOIN [dbo].[Vendor]b ON a.DOC_No = b.DOC
) A

Posted 17-Oct-19 19:29pm

Member 13437579

Updated 17-Oct-19 20:00pm

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RickZeeland · Answer 1 · 2019-10-17T20:01:00

Solution 1

You can use IS NOT NULL like this:

SELECT Orders.OrderID, Customers.CustomerName
FROM Orders
INNER JOIN Customers ON Orders.CustomerID = Customers.CustomerID
WHERE Customers.CustomerName IS NOT NULL;

SQL NULL Values - IS NULL and IS NOT NULL[^]

Posted 17-Oct-19 20:01pm

RickZeeland