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What we cover

Every part of SQL your course covers.

Queries

  • Joins and subqueries
  • GROUP BY and HAVING
  • Window functions
  • CTEs and recursive queries

Design

  • ER diagrams
  • Normalization to 3NF / BCNF
  • Keys and constraints
  • Indexes

Programming

  • Stored procedures
  • Triggers
  • Views
  • Transactions

Projects

  • Database design projects
  • Query optimization
  • Reporting
  • App + database integration
Example order

One SQL order, start to finish.

What the student uploaded, what came back, and how the price was set.

01The brief
Database SystemsUndergradDue in 48 hours

Top customers by quarterly revenue

Using the provided retail schema, return each quarter’s top 3 customers by revenue with their rank. Ties share a rank. Explain the query plan.

Requirements
  • Join customers, orders and order_items
  • Revenue per customer per quarter
  • Top 3 per quarter, ties share a rank
  • EXPLAIN output with notes
02The solution
top_customers.sql18 lines
1-- revenue per customer per quarter, then rank within each quarter
2WITH revenue AS (
3 SELECT c.customer_id, c.name,
4 date_trunc('quarter', o.order_date) AS quarter,
5 SUM(oi.qty * oi.unit_price) AS total
6 FROM customers c
7 JOIN orders o ON o.customer_id = c.customer_id
8 JOIN order_items oi ON oi.order_id = o.order_id
9 GROUP BY c.customer_id, c.name, quarter
10)
11SELECT quarter, name, total, rnk
12FROM (
13 SELECT *, DENSE_RANK() OVER (
14 PARTITION BY quarter ORDER BY total DESC) AS rnk
15 FROM revenue
16) ranked
17WHERE rnk <= 3
18ORDER BY quarter, rnk;
PostgreSQL 15 · 12 rows · 38 ms
03The explanation doc
explanation.pdf
1.
Why a CTE
Revenue is computed once and named, so the ranking query reads like the question.
2.
DENSE_RANK, not RANK
Ties share a rank and the next rank isn’t skipped, which is what “top 3 with ties” means.
3.
The plan
A hash join on order_id dominates; an index on orders(customer_id) cuts it by about half.
04The price
AI predicted budget
$50–$95
Level · UndergradIncluded
Deadline · 48 hoursRush
Shown before any contact details were shared.
Final price from our team
$70
Delivered 4h early
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  1. 01
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  2. 02
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  3. 03
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  4. 04
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Typical orders

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Query set (10–20 questions)
$50–$120
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Usually 2–3 days
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$150–$350
Usually 4–6 days
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