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SQLize.online is a free online SQL environment for quickly running, experimenting with and sharing code. You can run your SQL code on top of the most popular RDBMS including MySQL, MariaDB, SQLite, PostgreSQL, Oracle and Microsoft SQL Server.

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create table events ( id serial, user_id int, event_type varchar, event_time timestamp ); insert into events (user_id, event_type, event_time) values (1, 'display', now()), (1, 'display', now()),(1, 'click', now()),(1, 'display', now()), (2, 'display', now()), (2, 'click', now()); select clicks.user_id, count(display.id) from events clicks left join events display on display.user_id = clicks.user_id and display.event_type = 'display' and display.id < clicks.id -- should be changed to time comparsion where clicks.event_type = 'click' group by clicks.user_id

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