How to use UNION instead join

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I want to change the below sql script and use UNION

SELECT C.Customer_ID, C.Name, COUNT (I.Invoice_No) AS NumberOfInvoices, SUM (I.Total) AS SumOfTotal
FROM Customer C
LEFT JOIN Invoice I ON C.Customer_ID=I.Customer_ID
GROUP BY C.Customer_ID, C.Name

Thank you.

What I have tried:

I thought of creating a temp table

Posted 9-Oct-16 20:49pm

Avuy

Updated 11-Oct-16 0:19am

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Wendelius 10-Oct-16 3:48am

Converting join directly to union yields to different results. What is it you're trying to achieve?

2 solutions

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Avuy · Answer 1 · 2016-10-11T00:19:00

Solution 2

Thanks, this is what I did

SQL

SELECT C.Customer_ID, C.Name, Null,Null
FROM Customer C
UNION
SELECT I.Customer_ID, Null, COUNT (I.Invoice_No) AS NumberOfInvoices, SUM (I.Total) AS SumOfTotal
FROM Invoice I
GROUP BY I.Customer_ID, C.Name

Posted 11-Oct-16 0:19am

Avuy

Patrice T · Answer 2 · 2016-10-09T21:06:00

Solution 1

Read: SQL UNION Operator[^]

Good tutorial site: SQL Tutorial[^]

Posted 9-Oct-16 21:06pm

Patrice T