Overview: SQL remains a core skill for data management across industries in 2026Free courses build fundamentals while paid ...

Assuring optimal performance of database applications starts with coding properly formulated SQL. Poorly written SQL and application code is the cause of most performance problems. As much as 75% of ...

Shelley Doll finishes her coverage of SQL data types with an overview of datetime and interval data types. Learn more about the basic syntax of these standard SQL types. Datetimes and intervals are ...

Learn how to master the SELECT statement to form truly useful data queries. This article explains functions, clauses, and keywords that will make your life a lot easier. Due to popular demand, we’re ...

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This post is one of a series that introduces the fundamentals of NOSQL databases, and their role in Big Data Analytics. What is a navigational database? Navigational databases use a distinctive guided ...

What is an event store database? An event store is a database designed for tracking event as they occur, and maintaining a record of those events. How is an event store database different from a ...

Poke around the infrastructure of any startup website or mobile app these days, and you’re bound to find something other than a relational database doing much of the heavy lifting. Take, for example, ...

SQL databases have constraints on data types and consistency. NoSQL does away with them for the sake of speed, flexibility, and scale. One of the most fundamental choices to make when developing an ...