Sql Oracle在昨天一小时内未返回任何数据

我有以下疑问：

SELECT d_dtm,
       BTS_ID,
       CASE WHEN D_DTM = (D_DTM-24/24)
            THEN sum(V_ATT_CNT)
       END AS "LASTATT",

       sum(V_ATT_CNT) as "V_ATT_CNT",

       CASE WHEN D_DTM = D_DTM
            THEN sum(V_ATT_CNT)
       END AS "ATT"

 FROM DMSN.DS3R_FH_1XRTT_FA_LVL_KPI

WHERE to_date(D_DTM, 'DD/MM/yyyy') >=
      (SELECT TO_DATE(max(D_DTM),'DD/MM/YYYY') 
         FROM DMSN.DS3R_FH_1XRTT_FA_LVL_KPI)-2

GROUP BY d_dtm,
        BTS_ID

HAVING CASE WHEN D_DTM = (D_DTM-24/24)
           THEN sum(V_ATT_CNT)                
       END > 0

但由于“having”子句，它不会返回任何结果。我知道它应该返回结果，因为我希望它只在一列中显示当前时间段的V_ATT，在第二列中显示24小时前的V_ATT。我已经检查了数据，我应该会得到结果，但我似乎不明白为什么这不起作用……

如果你小计（分组）D_DTM，你会得到每个日期一行。如果您想在同一行中比较两个日期，您需要做两件事中的一件：子查询，或者像lag/lead这样的窗口函数

我想这就是你想要的：

SELECT d_dtm,
   BTS_ID,
   lag(sum(V_ATT_CNT), 1) over (partition by bts_id order by d_dtm) 
      AS "LASTATT",
   sum(V_ATT_CNT) as "V_ATT_CNT"

 FROM DMSN.DS3R_FH_1XRTT_FA_LVL_KPI

  WHERE to_date(D_DTM, 'DD/MM/yyyy') >=
     (SELECT TO_DATE(max(D_DTM),'DD/MM/YYYY') 
         FROM DMSN.DS3R_FH_1XRTT_FA_LVL_KPI)-2

 GROUP BY d_dtm,
    BTS_ID

---

请注意，lag/over中的

分区依据

列是

分组依据

列的子集。

我使用with语句和两个查询重新编写了查询。工作非常快，给我正确的结果

   WITH FRST
        AS (  SELECT D_DTM,
                     BSM_NM,
                     SUM (V_ATT_CNT) AS "V_ATT_CNT",
                     SUM (V_CUST_BLK_CNT) AS "V_CUST_BLK_CNT",
                     SUM (V_DRP_CALL_CNT) AS "V_DRP_CALL_CNT",
                     SUM (D_ATT_CNT) AS "D_ATT_CNT",
                     SUM (D_CUST_BLK_CNT) AS "D_CUST_BLK_CNT",
                     SUM (D_DRP_CALL_CNT) AS "D_DRP_CALL_CNT"
                FROM DMSN.DS3R_FH_1XRTT_FA_LVL_KPI
               WHERE D_DTM >=
                        (SELECT MAX (D_DTM) - NUMTODSINTERVAL (12, 'HOUR')
                           FROM DMSN.DS3R_FH_1XRTT_FA_LVL_KPI)
            GROUP BY D_DTM, BSM_NM),
        LST
        AS (  SELECT D_DTM,
                     BSM_NM,
                     SUM (V_ATT_CNT) AS "V_ATT_CNT",
                     SUM (V_CUST_BLK_CNT) AS "V_CUST_BLK_CNT",
                     SUM (V_DRP_CALL_CNT) AS "V_DRP_CALL_CNT",
                     SUM (D_ATT_CNT) AS "D_ATT_CNT",
                     SUM (D_CUST_BLK_CNT) AS "D_CUST_BLK_CNT",
                     SUM (D_DRP_CALL_CNT) AS "D_DRP_CALL_CNT"
                FROM DMSN.DS3R_FH_1XRTT_FA_LVL_KPI
               WHERE D_DTM >=
                        (SELECT MAX (D_DTM) - NUMTODSINTERVAL (48, 'HOUR')
                           FROM DMSN.DS3R_FH_1XRTT_FA_LVL_KPI)
            GROUP BY D_DTM, BSM_NM),
        EVDOLST
        AS (  SELECT D_DTM,
                     BSM_NM,
                     SUM (ATT_CNT) AS "ATT_CNT",
                     SUM (CUST_BLK_CNT) AS "CUST_BLK_CNT",
                     SUM (DRP_CALL_CNT) AS "DRP_CALL_CNT"
                FROM DMSN.DS3R_FH_EVDO_FA_LVL_KPI
               WHERE D_DTM >=
                        (SELECT MAX (D_DTM) - NUMTODSINTERVAL (48, 'HOUR')
                           FROM DMSN.DS3R_FH_EVDO_FA_LVL_KPI)
            GROUP BY D_DTM, BSM_NM),
        EVDOFRST
        AS (  SELECT D_DTM,
                     BSM_NM,
                     SUM (ATT_CNT) AS "ATT_CNT",
                     SUM (CUST_BLK_CNT) AS "CUST_BLK_CNT",
                     SUM (DRP_CALL_CNT) AS "DRP_CALL_CNT"
                FROM DMSN.DS3R_FH_EVDO_FA_LVL_KPI
               WHERE D_DTM >=
                        (SELECT MAX (D_DTM) - NUMTODSINTERVAL (12, 'HOUR')
                           FROM DMSN.DS3R_FH_EVDO_FA_LVL_KPI)
            GROUP BY D_DTM, BSM_NM)
   SELECT t1.D_DTM,
          t1.BSM_NM,
          t2.V_ATT_CNT AS "LASTV_ATTCNT",
          t2.V_CUST_BLK_CNT AS "LASTV_BLKCNT",
          t2.V_DRP_CALL_CNT AS "LASTV_DRPCNT",
          t1.V_ATT_CNT AS "V_ATT_CNT",
          t1.V_CUST_BLK_CNT AS "V_CUST_BLK_CNT",
          t1.V_DRP_CALL_CNT AS "V_DRP_CALL_CNT",
          t2.D_ATT_CNT AS "LASTD_ATTCNT",
          t2.D_CUST_BLK_CNT AS "LASTD_BLKCNT",
          t2.D_DRP_CALL_CNT AS "LASTD_DRPCNT",
          t1.D_ATT_CNT AS "D_ATT_CNT",
          t1.D_CUST_BLK_CNT AS "D_CUST_BLK_CNT",
          t1.D_DRP_CALL_CNT AS "D_DRP_CALL_CNT",
          t3.ATT_CNT AS "EVDO_ATTCNT",
          t3.CUST_BLK_CNT AS "EVDO_BLKCNT",
          t3.DRP_CALL_CNT AS "EVDO_DRPCNT",
          t4.ATT_CNT AS "EVDO_LASTATTCNT",
          t4.CUST_BLK_CNT AS "EVDO_LASTBLKCNT",
          t4.DRP_CALL_CNT AS "EVDO_LASTDRPCNT"
     FROM FRST t1
          INNER JOIN LST t2
             ON     t1.BSM_NM = t2.BSM_NM
                AND t1.D_DTM - NUMTODSINTERVAL (24, 'HOUR') = t2.D_DTM
          LEFT OUTER JOIN EVDOLST t4
             ON     t1.BSM_NM = t4.BSM_NM
                AND t1.D_DTM - NUMTODSINTERVAL (24, 'HOUR') = t4.D_DTM
          LEFT OUTER JOIN EVDOFRST t3
             ON t1.BSM_NM = t3.BSM_NM AND t1.D_DTM = t3.D_DTM

---

此条件

D_DTM=（D_DTM-24/24）

始终为FALSE。您的查询错误且难以读取。您需要添加示例数据。什么数据类型是

D_DTM

？您在某些地方将D_DTM视为日期，在其他地方将其视为字符串。如果是DD/MM/YYYY字符串，则不能对其进行MAX（）或减法。如果它是一个日期，那么您不需要将它转换为具有to_DATE（）的日期。我认为分区依据在我的情况下不起作用，因为分区依据查看行数。。。