SQL in 10 Minutes: A Fast Visual Refresher for Work & Interviews - Tapa blanda

Sinopsis

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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