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Accessing the custom database
As soon as you select a question that has a custom database attached. You can instantly write SQL queries against the data you have uploaded.
For example, lets say you upload a database that has a cities table, and a countries table.
SELECT c.name, c.population,
co.population as country_population
FROM cities AS c
JOIN countries AS co ON c.country_id = co.id;
Code language: PHP (php)