Bug reference: 15143 Logged by: David Email address: david@daily-harvest.com PostgreSQL version: 9.6.6 Operating system: Mac / DBeaver Description:
```
SELECT *, (P2.received_at - LAG(P2.received_at)) OVER (PARTITION BY anonymous_id ORDER BY P2.received_at DESC) AS time_diff --((EXTRACT(EPOCH FROM (P2.received_at - LEAD(P2.received_at)))/60)) OVER (PARTITION BY P2.anonymous_id ORDER BY P2.received_at DESC) AS time_diff_minutes FROM javascript.pages P2```
For the second line, I have to remove the parentheses around (P2.received_at - LAG(P2.received_at)) for it to run. Which doesn't make sense. And more importantly, I can't seem to get the 3rd line (currently commented out) to run because of this issue of Postgres seeming to not allow parentheses before the OVER
Working as documented:
"A window function call always contains an OVER clause directly following the window function's name and argument(s)"
When trying to create expressions using the result of a window function it is sometime necessary to move window function computation into a subquery and perform the calculations in the outer layer.
Note, the tutorial probably could use updating since a FILTER clause can be inserted in between the function invocation and the OVER...but only a FILTER clause.
