Example output: a Postgres query using two CTEs to find customers whose spend dropped, followed by three bullets on how it works and an index tip. — Example output

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SQL from a plain-English question

Arjun Mehta@arjun_codes

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Paste CREATE TABLE statements

Postgres / MySQL / SQLite

Question

The prompt

Here's my schema:

paste CREATE TABLE statements

Write a Postgres / MySQL / SQLite query that answers: question.

Use CTEs instead of nested subqueries, name columns clearly and handle NULLs explicitly. After the query, explain in three bullet points how it works, and one thing that could make it slow on a large table, with the index that would fix it.

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A bar chart from a table, with the one thing it shows