PostgreSQL subqueries allow one SQL query to run inside another, making it possible to solve filtering, aggregation, ...

As you will see in this chapter, companies use SQL Server for many types of applications and on most tiers now. Gone are the days when you would second guess yourself choosing to use SQL Server over a ...

This fifth edition of a well-known title has been updated for Oracle 12c. As with previous editions, the book is very hands-on; you’re introduced to a concept, shown an example, then asked to work ...

"Find the best-selling product from last year." When an AI system attempts to answer a question like this by querying a company database, even a single reference to a nonexistent item can cause the ...

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 ...

Let's break down when it's ideal to use the NOLOCK hint and when you should never use it. As a consultant, I work on wide swaths of database systems, which means I get to see many, many SQL statements ...

In our opinion, real data warehouses have all of the issues mentioned above. Hence, any text-to-SQL benchmark should address the difficulties of real-world data stores. Those that do not are of ...

Parameterized SQL queries can make PowerShell tools more secure and reliable while preserving smart quotes, emojis and other complex input.