"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 ...

It used to be that finding and using a sample SQL database was quite simple. In fact, the venerable Pubs database used to be installed as part of the SQL Server installation process. Fast forward to ...

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 ...

With JSON now the default format for moving data between clients and servers, SQL Server adds JSON support to make it easier to get your data out of the database and down to the client. SQL Server ...

If you are a SQL programmer, learning recursive SQL techniques can be a boon to your productivity. A recursive query is one that refers to itself. I think the best way to quickly grasp the concept of ...

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 ...

Here's a look at different ways to query Hadoop via SQL, some of which are part of the latest edition of MapR's Hadoop distribution SQL: old and busted. Hadoop: new hotness. That’s the conventional ...

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