数据有误差 包括一个到ivr但是没到坐席的记录

codegit/CallCenterApi/CallCenterApi.Interface/CallCenterApi.Interface/Controllers/tel/CallrecordsController.cs

                 #endregion
 
                 #region 服务水平
-                string sql1 = "select  isnull(SUM(case when RingLongTime<=20 and Callstate='1' then 1 else 0 end),0) as InTime,isnull(SUM(case when RingLongTime>20 and Callstate='1' then 1 else 0 end),0) as Delay,isnull(SUM(case when Callstate='1' then 1 else 0 end),0) as total from T_Call_CallRecords where calltype=0 and BeginTime BETWEEN '" + starttime + "' AND '" + endtime + "'";
+                string sql1 = "select  isnull(SUM(case when isnull(RingLongTime,0)<=20 and Callstate='1' then 1 else 0 end),0) as InTime,isnull(SUM(case when RingLongTime>20 and Callstate='1' then 1 else 0 end),0) as Delay,isnull(SUM(case when Callstate='1' then 1 else 0 end),0) as total from T_Call_CallRecords where calltype=0 and BeginTime BETWEEN '" + starttime + "' AND '" + endtime + "'";
                 DataRow dr1 = dtnew.NewRow();
                 DataSet ds1 = DbHelperSQL.Query(sql1);
                 if (ds1 != null && ds1.Tables.Count > 0)