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Certificate courseData & EngineeringIntermediate
SQL for Analytics & Engineering
Write the SQL that product, data and backend teams actually ship: correct joins, window functions, fast queries and safe changes to production data.
About 1 h of reading, plus practice5 modules · 25 quiz questions · final exam
Skills you'll learn
What you'll be able to do
- Design tables with the right keys, types and constraints
- Answer business questions with joins, aggregates and window functions
- Read an EXPLAIN plan and fix a slow query with the right index
- Change production data safely with transactions and migrations
- Spot NULL, duplicate-row and SQL injection bugs before they ship
Syllabus
- 1
How relational databases really work
6 min5-question quiz- Tables, rows and keys
- Constraints are free bug prevention
- Normalisation, in practice
- Data types that matter
- NULL means "unknown"
- How a query is processed
- Summary
- 2
Joins and aggregation for real business questions
5 min5-question quiz- The joins you'll actually use
- Fan-out: the silent number inflator
- GROUP BY and HAVING
- Dates and time buckets
- Subqueries vs CTEs
- CASE for business logic
- Summary
- 3
Window functions and CTEs
5 min5-question quiz- The anatomy of a window
- Ranking: ROW_NUMBER, RANK, DENSE_RANK
- Deduplication
- LAG and LEAD: comparing with neighbours
- Running totals and moving averages
- Share of total
- Cohort retention with CTEs
- Recursive CTEs
- Summary
- 4
Indexes and query performance
5 min5-question quiz- What an index is
- Composite indexes and column order
- Sargable queries
- Reading EXPLAIN
- Pagination at scale
- The N+1 problem
- Other habits that keep databases healthy
- Summary
- 5
Transactions, safe changes and security
5 min5-question quiz- ACID
- Race conditions and isolation levels
- Deadlocks
- Changing data safely
- Schema migrations without downtime
- SQL injection
- Least privilege and sensitive data
- Summary
- ★Final exam & certificate15 questions · 30 minutes · 70% to pass · 3 tries
Your certificate
HireSol certified in SQL for Analytics & Engineering
Signed by HireSol and verifiable online with its own ID. Download it as a PDF, add it to LinkedIn in one click, and it shows on your HireSol profile to companies.
Questions
- Who is this course for?
- College students, freshers and anyone switching careers who wants a job-ready grounding in SQL for Analytics & Engineering. It's an intermediate course; every module explains the ideas with worked examples from real jobs.
- Is the course online and self-paced?
- Yes. It's fully online: about 1 hours of reading across 5 modules, on your phone or laptop, whenever it suits you.
- How do I get the certificate?
- Pass the quiz at the end of each module (70% or more), then the final exam: 15 questions drawn from a larger pool, 30 minutes, 70% to pass, 3 tries. Your certificate is issued the moment you pass.
- Can recruiters check that my certificate is real?
- Yes. Every certificate has its own page on hiresol.cloud with an ID and a digital signature from HireSol, so anyone can verify your name, the course, your score and the date.
- What happens if I fail the final exam?
- You have 3 tries, with new questions each time. If all 3 miss the mark, the course locks and you can unlock it again to start over.