Joe Celko in Theory and design VIEW Objects A view is a virtual table, created when it’s invoked by the < view name>. The goal we had in... 13 January 2025 7 min read
Joe Celko in Theory and design Data Control Language (aka Security) Like ancient Gaul, SQL is divided into three sub- languages. The DDL (Data Declaration Language) declares the data. This is... 12 November 2024 11 min read
Joe Celko in Theory and design Transactions By now, pretty much everyone has heard the stories about the first computers. They were huge, cost a fortune, required... 29 October 2024 10 min read
Chisom Kanu in Big Data Consistency and Concurrency in NewSQL Database Systems Companies today require database systems that are reliable and capable of efficiently handling large volumes of data and numerous transactions.... 18 October 2024 36 min read
Joe Celko in Theory and design Rounding Numbers I would hope by now everybody has figured out when you see a price like $39.99 that it might as... 23 September 2024 12 min read
Adrien Payong in Theory and design Database Sharding: Strategies for Seamless Scaling and Performance Optimization Companies of all sizes and across industries are struggling to cope with an explosion of data never before seen in... 13 September 2024 21 min read
Joe Celko in Theory and design Uniqueness, Keys, and Identity If you’ve ever had a traditional logic course, you’ll have run into “The Law of Identity” as the founding principle... 09 September 2024 16 min read
Joe Celko in Theory and design Bad Data and Dirty Databases Many years ago, my wife and I wrote an article for Datamation, a major trade publication at the time, under... 28 August 2024 10 min read
Joe Celko in Theory and design LIKE Constraints In this article, I will cover a bit about the LIKE operator, including how it works, and a bit of... 19 August 2024 10 min read
Phil Factor in Theory and design Concepts and Issues in Test Data Generation Data generation is the science and art of providing data for database development work that is as realistic and controllable... 10 June 2024 11 min read
Theory and design Joe Celko in Theory and design The CHECK() Constraint One of the many ways a relational table differs from the file structures used by pre-relational storage systems is that... 20 May 2024 11 min read
Theory and design Phil Factor in Theory and design Database Subsetting and Data Extraction Let’s start by defining a subset and why you would require a data subset? When dealing with the development, testing... 17 April 2024 11 min read
Theory and design Joe Celko in Theory and design SQL Logic In this article, I will discuss the history and thinking behind several types of logic that are typically associated with... 29 March 2024 13 min read
Theory and design Joe Celko in Theory and design Department of Redundancy Department Ever wonder all the reasons that we use databases instead of file systems? While we don’t think of it too... 18 March 2024 12 min read
T-SQL Programming Itzik Ben-Gan in T-SQL Programming Two-Dimensional Interval Packing Challenge Packing intervals is a classic SQL task that involves packing groups of intersecting intervals to their respective continuous intervals. In... 02 January 2024 17 min read
PostgreSQL Boris Novikov in PostgreSQL Eager Aggregation in SQL queries Aggregation is a widely used way to summarize the content of a database. It is usually expressed with GROUP BY... 27 December 2023 15 min read
Theory and design Phil Factor in Theory and design Using a SQL Tokenizer Imagine this: you have several directories full of SQL script files, and you need to know where a certain table... 18 December 2023 9 min read
T-SQL Programming Aaron Bertrand in T-SQL Programming When an update doesn’t update Tell me if you’ve heard this one before: I changed data from my application, but when I checked the database,... 27 November 2023 5 min read
Theory and design Joe Celko in Theory and design The NTILE Function The SQL NTILE() is a window function that allows you to break a table into a specified number of approximately... 09 November 2023 8 min read
Theory and design Joe Celko in Theory and design First Normal Form Gets No Respect Dr. Codd first described the relational model in a paper in Communications of the ACM (CACM 13 No 6; June... 05 October 2023 13 min read
