我有三个mysql表:客户投诉康复问题陈述:我有50000多个客户，我想搜索有恢复请求的客户。Theproblemisprettysolved,andworkingcorrectly,buttheproblemisthequerytakesupto30minutesorlong.请指导我如何减少查询所花费的时间，或者如何加快搜索速度？这是mysql表的快速帮助ERD:AgainImakeitclear,theproblemissolved&worksfine,butthequerytakestoolongupto30minutesduetolargeamountofcustomeran