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Fitness Clubs SQL: Performance Queries

A 2-page snippet pack for indexing and query performance snippets for a fitness clubs database (members and checkins): 12 short entries with copy-ready code.

ForDevelopers

sql-performance-queries-for-fitness-clubs.pdfShowing 15 of 59 lines
// Read the query plan
EXPLAIN (ANALYZE, BUFFERS)
SELECT * FROM checkins
WHERE member_id = 42 AND status = 'completed';

// Index the foreign key
CREATE INDEX CONCURRENTLY checkins_member_id_idx
  ON checkins (member_id);

// Composite index
CREATE INDEX CONCURRENTLY checkins_member_id_checked_in_at_idx
  ON checkins (member_id, checked_in_at DESC);

// Partial index
CREATE INDEX CONCURRENTLY checkins_completed_idx

What's inside

Format
PDF, Markdown, SQL
Contents
12 queries
Version
1.0 · Updated 3 Oct 2026
Licence
Commercial What this means
Checked
Checked before it ships
  • sql-performance-queries-for-fitness-clubs.pdfPDF · 21 KB
  • sql-performance-queries-for-fitness-clubs.mdMarkdown · 2 KB
  • sql-performance-queries-for-fitness-clubs.sqlSQL · 2 KB
  • LICENSE.txtadded to every download

About this item

A compact, printable snippet pack for indexing and query performance snippets for a fitness clubs database (members and checkins). Each of the 12 entries has a one-line explanation and a small example you can paste into your editor. The PDF uses a two-column A4 layout designed to sit next to your keyboard, and the same content ships as Markdown so you can search it or drop it into your notes, plus a .sql file with every query. Every SQL example targets PostgreSQL 16.

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