In SQL Server 2017, automatic plan correction was added, which allows for the database engine to automatically use the "last known good plan" for a query that has suddenly regressed in performance.

This SQL feature allows you to query within a result set, creatively limit your result set, or correlate your results with an otherwise unrelated query in a single call to the database.

Note: This example uses a Version 6 view descriptor with the Pass-Through Facility to access DBMS data. Beginning in Version 7, you can associate a libref directly with your DBMS data and use the ...

Two caveats: First, even if you’re working with SQL Server 2016, your database’s compatibility level must be set to 130 or higher to use these features. You can view your database’s compatibility ...

The USING clause allows you to store DBMS connection information in a view by embedding the SAS/ACCESS LIBNAME statement inside the view. When PROC SQL executes the view, the stored query assigns the ...

In R, the sqldf package lets you run SQL queries on an R data frame, and that’s what I’ll use in this example. There’s a similar sqldf library in Python.

Microsoft has just added support for query hints to Azure SQL Database, giving database administrators a powerful tool to manage the performance of ISV application code. Here's how it works.