这里我有一个sql查询工作正常，就像trip_member表名
假设trip_member共有20条记录，这意味着我的SQL查询执行得非常完美，并且还能完美地返回响应。
我的查询
SELECT tm.empId, tm.pickupTime, tm.dropTime, td.companyId, td.tripId, td.startTime, td.endTime, td.tripDate, td.forceEndStatus, td.tripStatus, c.shiftTiming, c.routeId, c.cabId,(select count('*') from trip_member as m WHERE m.tripId=td.tripId and m.empPresentStatus = '1') as absentcount,(select count('*') from trip_member as m WHERE m.tripId=td.tripId and m.empPresentStatus = '0') as presentcount,(select count('*') from trip_member as m WHERE m.tripId=td.tripId and m.pickupotpStatus = '1') as pickupcount
FROM trip_member tm
LEFT JOIN trip_details td ON tm.`tripId` = td.`tripId`
INNER JOIN cab_allocation c ON c.`allocationId` = td.`allocationId` WHERE c.companyId = '1'
ORDER BY td.`id` DESC
LIMIT 10
但我的trip_member表我有20k记录，假设我正在执行查询现在意味着我收到这样的错误
＃2013 - 查询期间与MySQL服务器的连接丢失
我想我必须在我的表中使用索引，但我不知道如何使用索引以及我使用索引的哪些字段，如果有人知道请更新你的sql alter query in index