How to Write a Common Table Expression in PostgreSQL
Common table expressions (CTEs) are a great way to break up complex PostgreSQL queries. Here's a simple query to illustrate how to write a CTE:
with beta_users as (
select *
from users
where beta is true
)
select events.*
from events
inner join beta_users on beta_users.id = events.user_id
You can find a real world example of a CTE in How to Calculate Cumulative Sum/Running Total in PostgreSQL.
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