Technical Article

Concatenating Multiple Row Values into a Single Comma-Separated List

In scenarios where you need to consolidate multiple rows into a single, comma-separated value, you can achieve this using FOR XML PATH. This script demonstrates how to retrieve volunteer data and display the days they have selected for participation.

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2024-11-11 (first published: )

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Technical Article

While Loop in T-SQL

Often, we encounter situations where we need to loop through a dataset to process or update records iteratively. In such cases, I use WHILE loop like below. The example below demonstrates how a WHILE loop can be used to iterate Sales records. This approach is particularly effective when working with a numerical or date column, […]

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2024-10-15

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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