The HAVING and GROUP BY SQL clauses

This month's topic is one that often baffles inexperienced SQL coders. We will look at the GROUP BY clause, and then the difference between conditions placed in the WHERE clause, and the HAVING clause. I have used MySQL to test all of the examples, but most of them should work without any problems on other DBMS' too.

A New MCP Benefit

We would like to think that most DBAs are certified as at least MCPs if not MCDBAs. We have worked out a deal with Microsoft to provide yet another benefit for MCPs. Read on to find out more.

Secure options for remote SQL Server administration

In this two-part series, Serdar Yegulalp explains how to remotely administer SQL Server without compromising network security. In part one below, he describes two methods for providing secure administrative access to remote employees. In part two, he'll examine practical problems you may encounter when remotely administering SQL Server and how to work around them.

Surrounding the ETL Requirements

November 13, 2004 / Issue TOC

Surrounding the ETL Requirements

Before designing an ETL system, you must first understand all of your business needs.

By Ralph Kimball , Margy Ross

Ideally, the design of your extract, transform, and load (ETL) system begins with one of the toughest challenges: surrounding the requirements. By this we mean gathering in one place all the known requirements, realities, and constraints affecting the ETL system. The list of requirements is pretty overwhelming, but it's essential to lay them on the table before launching a data warehouse project.

The requirements are mostly things you must live with and adapt your system to. Within the framework of your requirements, you'll have many places where you can make your own decisions, exercise your judgment, and leverage your creativity, but the requirements are just what they're named. They are required.

Code Generation: Using SQL to Generate SQL and Other Code

SQL Server is a great platform against which to develop, but it can also be used as a code generation tool with a little creativity. Haidong Ji brings us a few techniques that can be used to automatically build T-SQL code and bcp code for importing and exporting data.

Using Parent Package Variables in Package Configurations

Package configurations are now the prescribed way of being able to set values within your package from an outside source. One of the options for the source is Parent Package Variable. The name is perhaps a little misleading so this article is meant to guide you through this slight confusion and into using them. It also helps to explain a key concept in SQL Server Integration Services

SQL Server Security Part 1

In this series of articles, Chris Kempster will discuss some of the finer aspects of SQL Server security and also touch on OS, physical and application security to open up this science for general discussion.

SQL Server 2000 Reporting Services Activation Process

SQL Server 2000 Reporting Services uses cryptography to protect account data. Learn how SQL Server 2000 Reporting Services generates and stores the keys required to encrypt data.

Using a Subquery in a T-SQL Statement

Sometimes the criteria for determining which set of records will be affected by a SELECT, UPDATE, DELETE and/or INSERT statement cannot be obtained by hard coding the selection criteria. Occasionally there is a need to use the results of a SELECT statement to help determine which records are returned or are affected by a T-SQL statement. When a SELECT statement is used inside another statement, the inside SELECT statement is known as a subquery. Subqueries can help to dynamically control the records affected by an UPDATE, DELETE or INSERT statement, as well as to help determine the records that will be returned by a SELECT statement. This article will show different examples of how to use a subquery to help clarify the records affected or selected by a T-SQL statement.

Monitoring Blocks

SQL Server excels at quickly acquiring and releasing locks to allow as much concurrency as possible on the server. However there are times that one user will block another, which can be a source of great user frustration as well as making the system appear to be slow. Leo Peysakhovich brings us some great information and code on how you can monitor and deal with blocking on your SQL Server 2000 server.