SQL PrepTrek with JobNetWork with JobNetWork

SQL is asked in almost every tech, data and analyst interview. This is a short, visual PDF that gets you ready for it without 500 pages of theory.

WHAT YOU GET (30-page PDF)

- 24 concept cards: a one-line answer, a small picture, a quick try-it, the common trap and how to say it in an interview

- 15 solved practice queries on a sample database (every query tested)

- 17 rapid-fire questions for last-minute revision

- A "Before you walk in" checklist

WHAT IS COVERED

- Basics: how a query runs, the four families of SQL commands

- Filtering and grouping: WHERE, GROUP BY, HAVING, aggregates, CASE

- Joins and subqueries: INNER / LEFT joins, finding unmatched rows, UNION

- Window functions: ROW_NUMBER, RANK, DENSE_RANK, running totals, LAG/LEAD

- Writing real queries: CTEs, NULL handling, duplicates, second highest salary, top N per group, safe updates and speed

WHO IT IS FOR

Students and freshers preparing for placements, and anyone switching into a data, analyst or software role.

TRY BEFORE YOU BUY

10 SQL cards are free on job-net-work.vercel.app/prep-trek/sql

Note: this is a study aid, not a guarantee of a job. Instant PDF download after payment.