Vol. I · A Postgres HandbookTwelve chapters · · 756 queries

The Query & the Schema

A reading-room reference for writing PostgreSQL by hand — selects to window functions, with the schema in plain view.

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Chapters · WHERE & Filtering · Query 004 / 030
EasyWHERE & Filtering

Find customers whose email contains "gmail"

The query

SQL
SELECT name, email, city
FROM customers
WHERE email ILIKE '%gmail%';
Tested against PostgreSQL 16

Note

“Leading wildcard % prevents index usage. Use pg_trgm extension for efficient text search.

Tables referenced

  • customers6 cols

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The Query & the Schema

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Compiled for Postgres 16 · MMXXVI