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SQL · LEARNING RESOURCE COLLECTION

Filtering, Sorting & Business Queries

Define a business population, handle missing values and build an ordered extract you can explain.

Original fictional case · Version 1.0 · Technical examples tested locally

One topic. Several ways to learn.

Read the study chapter in eight short parts. Try the worksheet before opening its solution companion. Use the same fictional dataset throughout.

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From 12 source orders, apply status, channel, value and January rules to get 3 eligible orders, then sort by value and ID.
  1. 12 source orders · one row per order.
  2. Filter to 3 orders · completed, web, at least EUR 100, January UTC.
  3. Sort the same 3 orders · value descending, ID ascending: O108, O110, O101.
F11’s population contract: filtering changes membership; sorting changes presentation.
01 / READ

Complete study chapter

Eight parts covering retrieval, expressions, Boolean logic, missing values, ordering, date boundaries and a business investigation. Six tested worked examples.

View the chapter contents
  1. The question before the query
  2. SELECT and FROM: shape a useful result
  3. WHERE: define the eligible population
  4. ORDER BY: make selection and ranking reproducible
  5. Translate a business request into conditions
  6. Find errors before presenting a result
  7. An operations shortlist you can explain
  8. Review, independent work and the next topic
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02 / PRACTISE

Worksheet 01 — Fundamentals

12 questions: concepts, query writing, output prediction, error detection and an operations shortlist. Printable HTML includes answer spaces.

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03 / INSPECT

SQL practice dataset

12 fictional orders with status, channel, date boundaries, equal values and missing promo codes. SQLite setup, CSV and data dictionary.

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04 / REVIEW

Detailed solution companion

Worked reasoning, executable reference SQL, tested result tables and checks. Separate from the student worksheet.

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NEXT / EXTEND

Worksheets 02–04 & independent business case

Planned supporter resources: intermediate investigations, broader business questions and advanced edge cases, with separate detailed solutions. These files have not been produced or published.

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