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Marketplace SQL: Data Cleanup Queries

A 2-page snippet pack for data cleanup and maintenance queries for a marketplace database (sellers and listings): 12 short entries with copy-ready code.

ForDevelopers

sql-cleanup-queries-for-marketplace.pdfShowing 18 of 72 lines
// Find duplicate email
SELECT email, count(*)
FROM sellers
GROUP BY email
HAVING count(*) > 1;

// Delete duplicates, keep the newest
DELETE FROM sellers
WHERE id IN (
  SELECT id FROM (
    SELECT id, row_number() OVER (PARTITION BY lower(email) ORDER BY id DESC) AS rn
    FROM sellers
  ) t
  WHERE rn > 1
);

// Trim stray whitespace
UPDATE sellers

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-cleanup-queries-for-marketplace.pdfPDF · 20 KB
  • sql-cleanup-queries-for-marketplace.mdMarkdown · 2 KB
  • sql-cleanup-queries-for-marketplace.sqlSQL · 2 KB
  • LICENSE.txtadded to every download

About this item

A compact, printable snippet pack for data cleanup and maintenance queries for a marketplace database (sellers and listings). 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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