SQL in 10 Minutes: A Fast Visual Refresher for Work & Interviews
You know SQL. The problem is remembering it when you actually need it.
You remember SELECT. You remember joins. But under interview pressure-or while staring at a query at work-can you immediately explain why WHERE cannot filter SUM(total), why a LEFT JOIN can accidentally behave like an INNER JOIN, or what NULL does to NOT IN?
SQL in 10 Minutes is a fast visual refresher for people who have seen SQL before and want the useful parts back in working memory.
This is not a from-zero SQL course. It is not a 600-page textbook. And it is not a flimsy cheat sheet.
It is a compact, MySQL-leaning field guide built around practical examples, result sets, visual mental models, recall drills, and the mistakes that actually cause confusion in interviews and real work.
Inside you'll refresh:
- Logical query processing: FROM → WHERE → GROUP BY → HAVING → SELECT
- NULL and three-valued logic
- IN, BETWEEN, LIKE, EXISTS, operators, and precedence
- ORDER BY, LIMIT, aggregates, GROUP BY, and HAVING
- INNER, LEFT, RIGHT, and full-outer-join concepts
- Join multiplication and duplicate-looking rows
- INSERT, UPDATE, DELETE, TRUNCATE, and DROP
- Transactions, COMMIT, ROLLBACK, and SAVEPOINT
- MySQL numeric, text, and temporal data types
- TIMESTAMP time-zone behavior vs. DATETIME
- Primary keys, foreign keys, constraints, and referential actions
- Indexes and EXPLAIN
- Views, CTEs, CASE, set operations, and window functions
- Important SQL Server-to-MySQL syntax differences
Throughout the book, recurring examples reduce context switching so you can focus on the SQL-not on learning a new toy scenario every page.
Use it before a technical screen. Before an interview. Before a meeting. Or keep it beside your keyboard for the moment when you know the concept but cannot remember the exact syntax.
Short enough to start now. Useful enough to keep nearby.
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