如何在mysql中计算这3个字段？ 案例 当EPro02.StartReportID=101且EventProvider02.StartVoltage=0时，则“电源断开” 当EventProvider02.StartSetTelliteCount

使用整个

案例…使用
count（）和
分组结束

CASE    
WHEN EPro02.StartReportID = 101 AND EventProvider02.StartVoltage = 0 THEN 'Power Supply Disconnected'

WHEN EventProvider02.StartSatelliteCount < 9 OR EventProvider02.StartGSMSignalLevel < 20 OR EventProvider02.StartGSMStatus != 9 THEN 'Network Outage'

WHEN EventProvider02.StartReportID = 13 THEN 'GSM Jamming'

END AS Reason

选择
案例
当EPro02.StartReportID=101且EventProvider02.StartVoltage=0时，则“电源断开”
当EventProvider02.StartSetTelliteCount<9或EventProvider02.StartGSMSignalLevel<20或EventProvider02.StartGSMStatus！=9然后是“网络中断”
当EventProvider02.StartReportID=13时，则为“GSM干扰”
作为理性的终结，
计数（大小写）
当EPro02.StartReportID=101且EventProvider02.StartVoltage=0时，则“电源断开”
当EventProvider02.StartSetTelliteCount<9或EventProvider02.StartGSMSignalLevel<20或EventProvider02.StartGSMStatus！=9时，则“网络中断”
当EventProvider02.StartReportID=13时，则为“GSM干扰”
结束）作为理由
从你的桌子上，加入这里
分组
当EPro02.StartReportID=101且EventProvider02.StartVoltage=0时，则“电源断开”
当EventProvider02.StartSetTelliteCount<9或EventProvider02.StartGSMSignalLevel<20或EventProvider02.StartGSMStatus！=9然后是“网络中断”
当EventProvider02.StartReportID=13时，则为“GSM干扰”
终止
您能更清楚地阐述您的问题吗？我想分别计算“电源断开”、“GSM干扰”和“网络中断”的次数。
SELECT 
CASE    
WHEN EPro02.StartReportID = 101 AND EventProvider02.StartVoltage = 0 THEN 'Power Supply Disconnected'
WHEN EventProvider02.StartSatelliteCount < 9 OR EventProvider02.StartGSMSignalLevel < 20 OR EventProvider02.StartGSMStatus != 9 THEN 'Network Outage'
WHEN EventProvider02.StartReportID = 13 THEN 'GSM Jamming'
END AS Reason, 
count(CASE    
WHEN EPro02.StartReportID = 101 AND EventProvider02.StartVoltage = 0 THEN 'Power Supply Disconnected'
WHEN EventProvider02.StartSatelliteCount < 9 OR EventProvider02.StartGSMSignalLevel < 20 OR EventProvider02.StartGSMStatus != 9 THEN 'Network Outage'
WHEN EventProvider02.StartReportID = 13 THEN 'GSM Jamming'
END) as Reason_count
FROM your_table_join_here
GROUP BY CASE    
WHEN EPro02.StartReportID = 101 AND EventProvider02.StartVoltage = 0 THEN 'Power Supply Disconnected'
WHEN EventProvider02.StartSatelliteCount < 9 OR EventProvider02.StartGSMSignalLevel < 20 OR EventProvider02.StartGSMStatus != 9 THEN 'Network Outage'
WHEN EventProvider02.StartReportID = 13 THEN 'GSM Jamming'
END