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SQL tricks with billionaires data

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

[Database Edition 08] Understand SQL Execution Plans! Essential Knowledge for Finding the Cause of Slow SQL

The theme for this time is SQL "execution plans."Execution plans are one of the technologies you absolutely must understand when considering database performance.However, this content might also be a ...

Differences between Subqueries and CTEs (WITH clauses)

For those new to data analysis, I will explain the differences and proper usage of the two tools for organizing complex ...
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How to solve advanced SQL problems step by step

Hard SQL interview questions test the advanced problem solving skills expected in many medium and senior level data analyst ...