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SQL reference Core SQL Functions Joins Window functions

SQL docs

Reference patterns, function guides, and practical SQL examples for data engineering teams.

SQL reference

A practical guide to SQL syntax, functions, ranking, joins, and window patterns you can actually use in production.

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Function reference

Browse the most-used SQL functions and their semantics.

SQL reference

Learn the core syntax, clauses, and query patterns.

Playground

Try snippets and compare output in real time.

Join patterns

See how table relationships are expressed in practice.

Core topics

SELECT, FROM, WHERE, and filtering semantics
JOIN patterns for fact and dimension tables
window functions like ROW_NUMBER, RANK, and DENSE_RANK
NULL handling, COALESCE, and boolean logic
aggregation, grouping, and ordering strategies

Best practices

prefer explicit ORDER BY when rank-based logic matters
keep grouping and partition logic readable
document edge cases before shipping reusable SQL
test patterns in the playground before productionizing them

SQL reference

Core SQL clauses, patterns, and production-safe query semantics.

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SQL reference Start here Core topics Best practices