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Generating Bar Charts with SQL

jerakeen pointed me to a post showing how you could Generate Simple Bar Charts From a MySQL Prompt. It’s a neat trick for quickly getting a feel for the distribution of values in a database. The post is MySQL centric, but you can do the same thing in any database. PostgreSQL’s REPEAT is very particular about being passed an INT, however, so you may have to cast the second argument:

SELECT foo_id, REPEAT('#', COUNT(*)::INT)
FROM bar
GROUP BY 1;