postgresql

External Article

PostgreSQL 101: The 10 key differences between SQL Server & PostgreSQL

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Join us for the second webinar in our PostgreSQL 101 series.

As a SQL Server developer or DBA, you have a broad skill set and have become accustomed to interacting with the larger #SQLFamily community. Now, by choice or necessity you've begun to explore PostgreSQL and things feel oddly familiar and foreign at the same time.

Join Ryan Booze on May 25th to find out the things that often trip up SQL Server users when they first start exploring PostgreSQL.

2023-05-22

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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

See possible answers