Getting ready for a SQL interview can feel like a big task. There are so many things to know, and interviewers love to ask about them! This guide is here to help. We’ve gathered some of the most ...

Hello, I have a query where Postgres and DuckDB handle aggregations differently. Our understanding is that this is a case where the SQL standard is vague and wanted to ask what semantics you mean to ...

The first release candidate (RC0) of SQL Server 2025 is now available. As we move toward general availability, our focus shifts to delivering enhanced stability, performance, and product improvements ...

Google’s query fan-out technique issues multiple background searches based on initial question. This system is active across AI Mode, Deep Search, and some AI Overview results. The approach relies on ...

At Microsoft Build 2025, we announced the public preview of SQL Server 2025. Built on a foundation of best-in-class security, performance, and availability, SQL Server 2025 empowers customers to ...

1️) Scalar Subquery in SELECT: SELECT e.emp_id, e.emp_name, e.salary, (SELECT ROUND(AVG(salary), 2) FROM employees WHERE dept_id = e.dept_id) AS dept_avg_salary FROM employees e; 2️) Correlated ...