具有多个计数的MySQL性能

Question

Is it faster to have multiple MySQL Count instances in one query or separate queries for each count instance? And If so how would I combine these two queries?

 $msd_call_qry = "SELECT count(event) AS MissedCalls  FROM queuelogdb.queue_log WHERE (agent = '$agent_name[0]' OR agent = '$agent_name[1]')"
                . " AND (event = 'ABANDON' OR event = 'RINGNOANSWER') AND queuename IN ('500','505') AND time BETWEEN '$lastDay' AND '$today'";

 $ttl_call_qry = "SELECT count(event) AS TotalCalls from queuelogdb.queue_log WHERE (agent = '$agent_name[0]' OR agent = '$agent_name[1]') "
                . "AND event = 'CONNECT' AND queuename IN ('500','505') AND time BETWEEN '$lastDay' AND '$today'";

Answer 1

Your table is the same. Most of the conditions in the WHERE clause are the same. So, you should be able to use conditional aggregation:

SELECT SUM(event = 'ABANDON' OR event = 'RINGNOANSWER') AS MissedCalls,
       SUM(event = 'CONNECT') AS TotalCalls
FROM queuelogdb.queue_log
WHERE agent IN ('$agent_name[0]', '$agent_name[1]') AND
      queuename IN ('500', '505') AND
      time BETWEEN '$lastDay' AND '$today'". ";