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Getting a Query Execution Plan in PostgreSQL

Introduction You often need to check the performance of a PostgreSQL query you just wrote to look for some way to improve performance. In order to do this, you need a report of the query execution, which is called the execution plan). The query execution plan gives you the entire summary of the query execution […]

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2021-03-18

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Reusing Query Results in SSMS

Every time you need to reuse the query results from SSMS, for example to populate another table, or to search for matching rows in another table, it will inevitably mean a lot of manual tweaking to the get the results into the right format. Louis Davidson uncovers three SQL Prompt gems that can remove all this pain.

2021-03-16

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The Empty Aggregate

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Question of the Day

The Empty Aggregate

I have this table in a SQL Server 2025 database:

CREATE TABLE [dbo].[CustomerOrder]
(
[OrderID] [int] NULL,
[CustomerID] [int] NULL,
[total] [money] NULL
) ON [PRIMARY]
GO
What is returned from this code? (answers are for the sum and then the count)
SELECT SUM(total) AS sum,
       COUNT(total) AS count
FROM dbo.CustomerOrder;



See possible answers