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Free SQL
Reference Pack
20 pages of SQL content · 19 focused guides
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Normally included with SQL Master Pro. Available free through this limited campaign.
Practical, concise, cross-dialect
The SQL reference you'll actually use.
Quick explanations, real queries, common pitfalls, and interview-ready distinctions—without publishing the full paid pack on the web.
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JOINs & common LEFT JOIN pitfalls
Aggregate functions
CTEs & subqueries
Window functions
ROW_NUMBER vs RANK vs DENSE_RANK
LAG, LEAD & running totals
NULL handling
SQL interview quick reference
PostgreSQL, SQL Server & MySQL differences
Real pages from the pack
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