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PostgreSQL HAVING,LIMIT and FETCH Clauses

Overview In this article, we will cover these PostgreSQL clauses with examples: HAVING, LIMIT and FETCH. In a previous article we discussed the WHERE, ORDER BY and GROUP BY  clauses. Click the link if you wish to learn about those clauses. HAVING Clause The HAVING clause works on grouped data returned by a GROUP BY. […]

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2021-06-25 (first published: )

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SQLServerCentral Article

Implement Azure SQL Elastic Jobs with PowerShell

In this article, I will work you through the process of creating elastic jobs in Azure using PowerShell. The elastic jobs are similar to regular agents jobs in SQL Server although they add extra functionality like for example dedicated target groups that can be used in the job step level. Currently, the elastic jobs are […]

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2021-06-21 (first published: )

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SQLServerCentral Article

Conditional DELETE and INSERT in PostgreSQL

Introduction We are comfortable with inserting/deleting record(s) into/from a table. But we sometimes get confused when we need to insert or delete records conditionally from a table. Let us look at an example. Example scenario Suppose we have a table, called ALL_EMPLOYEES, which contains all employees' information who are working or had ever worked for […]

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2021-06-18 (first published: )

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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