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Returning tables and sets
Summary

Instruction

Another way to call a function is like so:

SELECT * FROM get_events('2017-01-01', '2017-12-31');

This statement returns the table that we defined in the function's body.

Exercise

Show all active users (show user_id, user_name) and the number of posts each of them created.

Stuck? Here's a hint!

Treat the function as a table. You'll have to join the result of the function get_active_users() with the post table.