纠正sql中的大小写差异

soc-modules/soc-modules-iot/src/main/resources/mapper/DvrDiskMapper.xml

@@ -146,7 +146,7 @@
 
     <select id="diskStatistic" resultType="com.xunmei.iot.vo.dvrDisk.DvrDiskStatisticVo">
         SELECT count(0) AS dvrTotal,
-        SUM(DD.count) AS diskTotal,
+        SUM(dd.count) AS diskTotal,
         SUM(dd.exceptionCount) as diskExceptionCount
         FROM iot_device d
         LEFT JOIN (SELECT host_code,count(0) as count,SUM(if(state=1,1,0)) as exceptionCount from iot_dvr_disk WHERE