Moving Average based on Timestamps in PostgreSQL

Question

I wanted to perform moving average through timestamps. I have two columns: Temperature and timestamps (time-date) and I want to perform the moving average based on every 15

Answer 1

You can join your table with itself:

select l1.id, avg( l2.Temperature )
from l l1
inner join l l2 
   on l2.id <= l1.id and
      l2.Timestamps + interval '15 minutes' > l1.Timestamps
group by l1.id
order by id
;

Results:

| ID |            AVG |
-----------------------
|  1 |           5.39 |
|  2 |          5.365 |
|  3 | 5.296666666667 |
|  4 |         5.3575 |
|  5 |          5.346 |
|  6 | 5.321666666667 |
|  7 | 5.331428571429 |

Notice: Only 'hard work' is made. You should join result with original table or append new columns to query. I don't know your final query needed. Adapt this solution or ask for more help.