Databases

SQL Server, PostgreSQL, MySQL, Oracle, MongoDB and more – find all database-related Simple Talk content here. Tutorials, guides, opinion, and more.

EzzEddin Abdullah in PostgreSQL

PostgreSQL Performance Troubleshooting: EXPLAIN, Index Design, Unique and Partial Indexes

Troubleshooting and fixing PostgreSQL performance issues - using EXPLAIN and EXPLAIN ANALYZE to diagnose slow queries, designing unique indexes for...

25 May 2022 14 min read

Image of author: Dennes Torres

Dennes Torres in BI

Azure Synapse Link for SQL: From production to a data warehouse in a few clicks

Microsoft announced Azure Synapse Link for SQL. In this article, MVP Dennes Torres explains the new feature.…

24 May 2022 18 min read

Theory and design

Image of author: Joe Celko

Joe Celko in Theory and design

The VALUES clause or building tables out of nothing

The VALUES clause makes inserting literal values into a table simple and easy. In this article, Joe Celko explains how...

23 May 2022 6 min read

Image of author: Lukas Vileikis

Lukas Vileikis in MySQL

Security in MySQL: Part One

There are several tools available to keep a MySQL database secure. In this article Lukas Vileikis discuses access control and...

20 May 2022 8 min read

Image of author: Edward Pollack

Edward Pollack in BI

SSRS ReportServer Database: Tables & Queries

Explore the SSRS ReportServer database structure - Catalog, ExecutionLog, Subscriptions, and more. Includes ready-to-use SQL queries for report metadata, usage...

11 May 2022 18 min read

Image of author: Robert Sheldon

Robert Sheldon in MySQL

Working with MySQL stored functions

Stored functions in MySQL return a scalar value and can be used in a SQL statement. In this article, Robert...

09 May 2022 17 min read

Theory and design

Image of author: Joe Celko

Joe Celko in Theory and design

Combinations, permutations, and derangements

Joe Celko explains how several mathematical concepts, combinations, permutations, and derangements, relate to databases.…

03 May 2022 8 min read

Image of author: Lukas Vileikis

Lukas Vileikis in MySQL

Optimizing my.cnf for MySQL performance

Database systems often need tuning for best performance. Lukas Vileikis explains to how to optimize my.cnf for MySQL performance.…

02 May 2022 13 min read

T-SQL Programming

Image of author: Edward Pollack

Edward Pollack in T-SQL Programming

Getting results using less T-SQL

There is usually more than one way to write a query. In this article, Edward Pollack explains a few ways...

27 April 2022 16 min read

Jonathan Lewis in Oracle

Oracle optimizer removing or coalescing subqueries

The Oracle optimizer often changes the query to get better performance. In this article, Jonathan Lewis explains two more optimizations...

27 April 2022 17 min read

Learn SQL Server

Image of author: Greg Larsen

Greg Larsen in Learn SQL Server

The ins and outs of joining tables in SQL Server

Most database queries require joining tables. In this article, Greg Larsen explains the ins and outs of joining tables in...

21 April 2022 11 min read

Priyanka Chouhan in Security

SQL Server vulnerabilities and assessment

SQL Server has many features to keep the database secure, but you must implement them to benefit. In this article,...

21 April 2022 11 min read

Image of author: Lukas Vileikis

Lukas Vileikis in MySQL

The nuances of MySQL indexes

Indexes are critical for database performance. In this article, Lukas Vieikis explains the many types of indexes available with MySQL.…

21 April 2022 14 min read

Image of author: Rajeshkumar Sasidharan

Rajeshkumar Sasidharan in MySQL

A MySQL story: Can system engineers solve database issues using system tools?

A story about how a system engineer solved a MySQL performance issue written by Rajeshkumar Sasidharan.…

20 April 2022 14 min read

Image of author: Dennes Torres

Dennes Torres in BI

How to automate table level refresh in Power BI

You can automate Power BI table refreshes using PowerShell, an Automation Account, and Runbook. Dennes Torres explains how in this...

18 April 2022 14 min read

Image of author: Robert Sheldon

Robert Sheldon in MySQL

Working with MySQL Stored Procedures

MySQL stored procedures are objects containing one or more SQL statements for reuse. They often contain business logic. Robert Sheldon...

15 April 2022 19 min read

Image of author: Sanil Mhatre

Sanil Mhatre in BI

Finding deeper insights with Topic Modeling

Topic modeling can be used to find more detailed insights into text than a word cloud can provide. Sanil Mhatre...

06 April 2022 23 min read

Image of author: Samuel Nitsche

Samuel Nitsche in Oracle

Why your PL/SQL needs to be testable – and how to do it: Part 1

Part 1: What is testable code, why is it important, and first glimpses on practices that can help Anyone familiar...

05 April 2022 15 min read

Image of author: Adam Aspin

Adam Aspin in BI

DAX Table Functions in Power BI Paginated Reports: Advanced Patterns and Tips

Advanced DAX patterns for Power BI paginated reports: simulate NOT IN, remove filter columns, build complex OR filters across multi-select...

22 March 2022 21 min read

Jonathan Lewis in Oracle

Oracle subquery caching and subquery pushing

In this article, Jonathan Lewis discusses why you might want to stop the optimizer from unnesting some subqueries and how...

18 March 2022 12 min read

Subscribe for more

Get selected articles, event information, podcasts and other industry content delivered straight to your inbox.