"I thought LEFT JOIN would keep the data on the left, but the number of records decreased when I added WHERE."When creating ...

Even though the intention is an outer join that keeps all rows from A, rows missing in B are disappearing. First, I want to ...

This module introduces SQL joins, which are essential for combining data from multiple tables. You learn about INNER JOIN, LEFT JOIN, RIGHT JOIN, FULL OUTER JOIN, and NATURAL JOIN. Before starting ...

NRR is easy to inflate by accident. Runnable SQL for net and gross revenue retention, the retention bridge, a monthly trend, ...

Malek Damiri shows how to backtest a customer health score in SQL: point-in-time snapshots, churn by band, and AUC against a ...

In Azure SQL Database, the server is a logical concept and permissions can't be granted at the server level. To simplify permission management, Azure SQL Database provides a set of fixed server-level ...

LookML metadata indexing in Google Cloud Knowledge Catalog is now GA, grounding Gemini Enterprise and AI agents in governed ...

Intermediate SQL tutorial demonstrating REGEXP for advanced filtering, IF & CASE statements to create categories, SUBQUERIES ...

Data architectures are consolidating around open table formats and flexible compute engines. As data volumes grow and AI workloads become more demanding, maintaining multiple copies of the same ...

Screening candidates for "Head of AI" roles reveals a trend of puffed-up resumes. Here is how to spot fake experience and ...