DevOps

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6 New Courses Published on the Redgate University

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Master the fundamentals of Redgate products with easy to follow video courses on Redgate University. This month 6 new courses have been published to help you advance your skills including courses on SQL Prompt, SQL Monitor, SQL Change Automation, SQL Compare, and Database DevOps for Oracle. All brought to you by some amazing presenters like Kendra Little, Grant Fritchey, Kathi Kellenberger and the Redgate team of experts. Start learning now!

2020-07-17

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Question of the Day

Using Outer Joins

I have this data in a SQL Server 2019 database:

Customer table
CustomerID CustomerName
1          Steve
2          Andy
3          Brian
4          Allen
5          Devin
6          Sally

OrderHeader table
OrderID CustomerID OrderDate
1       1          2024-02-01
2       1          2024-03-01
3       3          2024-04-01
4       4          2024-05-01
6       4          2024-05-01
7       3          2024-06-07
8       2          2024-04-07
I want a list of all customers and their order counts for a period of time, including zero orders. If I run this query, how many rows are returned?
SELECT 
  c.CustomerName, COUNT(oh.OrderID)
 FROM dbo.Customer AS c
LEFT JOIN dbo.OrderHeader AS oh ON oh.CustomerID = c.CustomerID
WHERE oh.Orderdate > '2024/04/01'
GROUP BY c.CustomerName

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