change(steamMY) - 更新报表数据计算方式

- 新增 expand 字段用于计算蒸汽流量差值
- 保留 instrument_value 字段作为原始数据

steamMY.sql

@@ -10,7 +10,8 @@ BEGIN
  INSERT INTO ems_report_point_steam (monitor_code, instrument_value,begin_time,end_time,record_time) 
     SELECT 
            t1.monitor_code                                                       AS monitor_code,
-           CONVERT(DECIMAL(18, 2), ISNULL((t3.steam_flow-t4.steam_flow),0))                            AS instrument_value,
+           CONVERT(DECIMAL(18, 2), ISNULL((t3.steam_flow-t4.steam_flow),0))                            AS expand,
+           ISNULL(t3.steam_flow,0)                                              AS instrument_value,
 
            DATEADD(HH, -1, @dateinfo)                                         AS begin_time,
            DATEADD(HH, 0, @dateinfo)                                          AS end_time,