SQL Cheat Sheet for Interviews and Exams

Master SQL with This Detailed Cheat Sheet

This comprehensive SQL cheat sheet is designed for students, job seekers, and professionals who want a quick reference for SQL syntax, commands, and best practices. Whether you're preparing for technical interviews or exams, this cheat sheet covers everything you need.

What's Inside:

Document Overview

The SQL Comprehensive 50-Page Reference Manual:

1. Foundations & Architecture (Pages 1–2): SQL engine architecture, parser/optimizer lifecycles, and the 8-step logical query processing order.

2. Data Types & Storage Layouts (Pages 3–5): Exact numeric types (DECIMAL), string types (CHAR, VARCHAR, TEXT), and timezone-aware temporal types (TIMESTAMPTZ).

3. Data Definition & Integrity Constraints (Pages 6–12): Databases, schemas, table structures, PRIMARY KEY, referential FOREIGN KEY cascades, CHECK constraints, schema migrations (ALTER TABLE), and object deletion (DROP vs TRUNCATE vs DELETE).

4. Data Manipulation & Query Projection (Pages 13–17): Batch inserts, safe updates, soft deletion strategies, explicit column projections, and set deduplication (DISTINCT).

5. Filtering & Logic (Pages 18–25): SARGable comparisons, operator precedence, wildcard searches, three-valued logic (IS NULL), sorting rules, keyset pagination, and conditional expressions (CASE, COALESCE, NULLIF).

6. Aggregations & Grouping (Pages 26–29): Summary functions, GROUP BY invariants, HAVING vs WHERE, and multi-dimensional ROLLUP/CUBE grouping.

7. Relational Joins & Set Operations (Pages 30–37): Inner joins, left/right/full outer joins, cartesian cross joins, hierarchical self joins, non-equi joins, and set operations (UNION, INTERSECT, EXCEPT).

8. Subqueries & CTEs (Pages 38–41): Scalar expressions, correlated subqueries (EXISTS), modular Common Table Expressions, and recursive tree traversals.

9. Analytic Window Functions (Pages 42–45): Window partitions, ranking mechanisms (ROW_NUMBER, RANK, DENSE_RANK), offset lookups (LAG, LEAD), and sliding frame boundaries (ROWS vs RANGE).

10. Views, Indexing, Transactions & Performance Tuning (Pages 46–50): Materialized view caches, B-Tree indexes, ACID guarantees, transaction isolation levels, execution plans (EXPLAIN ANALYZE), and SARGability optimization rules.

Format: PDF (printable and mobile-friendly)

Who is this for? Students preparing for SQL exams, developers refreshing their knowledge, and interviewees revising key concepts.

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