Question

2 Tables with the below model:

Id: long unique; timestamp:long; price:double

The data in both tables are identical except timestamp.
Timestamp is given as unix_time in ms.

Question: how many pairs have a bigger time difference than 1000ms?

Answer 1

Try this:

SELECT COUNT(*)
FROM Table1 t1 INNER JOIN Table2 t2 ON t1.id = t2.id
WHERE 
    (t1.timestamp - t2.timestamp > 1000) or 
    (t2.timestamp - t1.timestamp > 1000)