Question

I am trying to run the following query:

SELECT COUNT(*) FROM (
SELECT * FROM vqm_packets WHERE call_end >= DATE_SUB(NOW(), INTERVAL 1 MINUTE) 
UNION ALL 
SELECT * FROM vqm_archive WHERE call_end >= DATE_SUB(NOW(), INTERVAL 1 MINUTE)) AS t;

I am trying to find only records newer than 1 minute. One would think that further restricting the interval (changing to 1 second for example) would decrease the record count, but it is not. I would assume that the issue is with my time restriction based on the call_end field (a datetime field, in UTC). Just curious if anyone can see any issues with the query? If not, are there any issues when using now() and UTC?

Answer 1

If your datetime fields are set to UTC times, then you would want to use UTC_TIMESTAMP() instead of NOW() for comparisons.