The error “Column is invalid in the select list because it is not contained in either an aggregate function or the GROUP BY clause” appears when a query uses ...

Who are these scripts for? You need to troubleshoot performance problems with SQL Server, and you need to do it now. You don't have time to track down a bunch of DMVs, figure out Extended Events, ...

A tool which treats CSV and JSON files as SQL tables, performs SQL SELECT queries on them, and stores the result into CSV and JSON files. Many tools and systems can export their data to CSV. Typical ...

A Technical Project Manager with expertise in agile methodologies, project planning, quality assurance, and more. SQL (Structured Query Language) is the universal language for managing and interacting ...

Your browser does not support the audio element. Hello Devs, SQL is one of the most essential skills in today's increasingly data-driven world. It's vital for any ...

This article was written in collaboration with Bohan Zhang and originally appeared on the OtterTune website. In this article, we’ll dive into MVCC: what it is, how PostgreSQL does it, and why it is ...

Part of the SQL Server 2022 blog series. Cardinality estimation (CE) is a process used by the query optimizer to estimate the number of rows returned by a query or sub-part of a query. These estimates ...