Data Science, Analytics, Programming, Software Development, Sql.
select sum(step1) as step1, sum(step2) as step2, sum(step3) as step3 from e1 left join e2 on e1.uid = e2.uid left join e3 on e2.uid = e3.uid This is a three-step funnel calculation. SQL lacks order-related calculations and is not completely set-oriented. It needs to detour into multiple subqueries