同一表上的LEFT OUTER JOIN返回0條記錄

Question

我已經在其他帖子上搜索了我的問題，但沒有任何效果。

我有一個包含客戶的表和餐廳的營業額預測數據，計划值和已實現值都在同一表中（必須與以前的數據庫保持一致）。

我需要獲得特定餐廳（站點）和特定活動（餐廳，外賣店，單擊“ n收集”）以及日期范圍（通常是一個月）的過去一年的計划的預測和已實現的預測。

我的問題是，當計划的預測不存在並且實現的最后一年存在時，請求什么也不會返回。

這是我的要求：

SELECT 
    P.AFO_ACTIVITY_ID,
    P.AFO_SITE_ID,
    P.AFO_FORECAST_DATE,
    P.AFO_SERVICE_ID,
    P.AFO_PLANNED_CUSTOMERS,
    P.AFO_REALIZED_CUSTOMERS,
    P.AFO_GROUP_CUSTOMERS,
    P.AFO_PLANNED_TURNOVER,
    P.AFO_REALIZED_TURNOVER,
    P.AFO_GROUP_TURNOVER,
    P.AFO_NB_EMPLOYEES,
    P.AFO_TURNOVER_EMPLOYEES,
    P.AFO_ID,
    p2.AFO_REALIZED_CUSTOMERS AS REAL_CUSTOMERS_PREVIOUS_YEAR,
    p2.AFO_REALIZED_TURNOVER  AS REAL_TURNOVER_PREVIOUS_YEAR
FROM 
    ACT_FORECAST P
LEFT OUTER JOIN 
    act_forecast p2 ON p2.AFO_FORECAST_DATE = p.AFO_FORECAST_DATE - 364
                    AND p2.AFO_SITE_ID = p.AFO_SITE_ID
                    AND p2.AFO_ACTIVITY_ID = p.AFO_ACTIVITY_ID
                    AND p2.AFO_SERVICE_ID = p.AFO_SERVICE_ID
WHERE 
    P.AFO_SITE_ID = :siteid
    AND P.AFO_ACTIVITY_ID = :activityid
    AND P.AFO_FORECAST_DATE BETWEEN :startdate AND :enddate

如果我播放2018年2月的請求，我將有我的數據（2018年和2017年）。

但是，如果我在2019年2月播放它，則一無所有，這對於該年的計划部分是可以的，因為尚未完成預測，但對於上一年的部分，我應該有一些數據。

我也嘗試過RIGHT OUTER JOIN，但沒有任何結果。

樣本數據 ：

ActivityId SiteId ForecastDate ServiceId PlannedCustomers RealizedCustomers GroupCustomers PlannedTurnover RealizedTurnover GroupTurnover NbEmployeeMeal TurnoverEmployeeMeal ID      RealizedCustomersPreviousYear RealizedTurnoverPreviousYear
1          58     01/02/18     1         0                0                 0              0               11               0             0              11                   2953773 0                             39,85
1          58     01/02/18     3         345              398               0              3467,25         4052,01          0             0              0                    2953774 328                           3291,53
1          58     01/02/18     5         10               16                0              140             194,04           0             16             60,9                 2953775 7                             91,12
1          58     01/02/18     7         125              151               0              1200            1413,93          0             0              0                    2953776 112                           1063,89

有任何想法嗎？

問候

Answer 1

您的where子句僅在您指定范圍內的P中查找記錄。 如果沒有，有沒有源行至左從外連接。

您可以通過內聯視圖或CTE生成您正在查看的時段內的所有可能日期，然后查找與任一日期集匹配的記錄：

WITH CTE (this_year, last_year) AS (
  SELECT :startdate + level - 1, :startdate + level - 365
  FROM dual
  CONNECT BY level <= :enddate - :startdate + 1
)
SELECT 
    :activityid AS AFO_ACTIVITY_ID,
    :siteid AS AFO_SITE_ID,
    CTE.this_year AS AFO_FORECAST_DATE,
    P.AFO_SERVICE_ID,
    MAX(CASE WHEN P.AFO_FORECAST_DATE = this_year
      THEN P.AFO_PLANNED_CUSTOMERS END) AS AFO_PLANNED_CUSTOMERS,
    MAX(CASE WHEN P.AFO_FORECAST_DATE = this_year
      THEN P.AFO_REALIZED_CUSTOMERS END) AS AFO_REALIZED_CUSTOMERS,
    MAX(CASE WHEN P.AFO_FORECAST_DATE = this_year
      THEN P.AFO_GROUP_CUSTOMERS END) AS AFO_GROUP_CUSTOMERS,
    MAX(CASE WHEN P.AFO_FORECAST_DATE = this_year
      THEN P.AFO_PLANNED_TURNOVER END) AS AFO_PLANNED_TURNOVER,
    MAX(CASE WHEN P.AFO_FORECAST_DATE = this_year
      THEN P.AFO_REALIZED_TURNOVER END) AS AFO_REALIZED_TURNOVER,
    MAX(CASE WHEN P.AFO_FORECAST_DATE = this_year
      THEN P.AFO_GROUP_TURNOVER END) AS AFO_GROUP_TURNOVER,
    MAX(CASE WHEN P.AFO_FORECAST_DATE = this_year
      THEN P.AFO_NB_EMPLOYEES END) AS AFO_NB_EMPLOYEES,
    MAX(CASE WHEN P.AFO_FORECAST_DATE = this_year
      THEN P.AFO_TURNOVER_EMPLOYEES END) AS AFO_TURNOVER_EMPLOYEES,
    MAX(CASE WHEN P.AFO_FORECAST_DATE = this_year
      THEN P.AFO_ID END) AS AFO_ID,
    MAX(CASE WHEN P.AFO_FORECAST_DATE = last_year
      THEN P.AFO_REALIZED_CUSTOMERS END) AS REAL_CUSTOMERS_PREVIOUS_YEAR,
    MAX(CASE WHEN P.AFO_FORECAST_DATE = last_year
      THEN P.AFO_REALIZED_TURNOVER END) AS REAL_TURNOVER_PREVIOUS_YEAR
FROM
    CTE
JOIN
    ACT_FORECAST P
ON
    P.AFO_FORECAST_DATE = CTE.this_year
OR
    P.AFO_FORECAST_DATE = CTE.last_year
WHERE 
    P.AFO_SITE_ID = :siteid
    AND P.AFO_ACTIVITY_ID = :activityid
GROUP BY
    :activityid,
    :siteid,
    CTE.this_year,
    P.AFO_SERVICE_ID;

與其嘗試外部聯接（無論哪種方式），它都不是尋找兩年中的特定日期，而是進行一種手動樞紐操作，以在右側欄中顯示相關年份的價值。 注意最后兩列的表達式使用last_year ，其余的使用this_year （分組的除外）。

對於SERVICE_ID ，如果今年沒有值，則可能希望合並以獲取上一年的值。 如果不想看到空值，也可以將其他值合並為零。

---

如果您不想使用WITH子句，則可以使用內聯視圖：

SELECT
...
FROM
    (
        SELECT :startdate + level - 1 AS this_year,
               :startdate + level - 365 AS last_year
        FROM dual
        CONNECT BY level <= :enddate - :startdate + 1
    ) CTE
JOIN
    ACT_FORECAST P
...

盡管您可能想要一個比CTE更具描述性的名稱（使用任一版本...）

---

將樣本數據重新整理為CTE后，問題中未顯示的值將為空：

with act_forecast (afo_activity_id, afo_site_id, afo_forecast_date, afo_service_id,
  afo_planned_customers, afo_realized_customers, afo_group_customers,
  afo_planned_turnover, afo_realized_turnover, afo_group_turnover,
  afo_nb_employees, afo_turnover_employees, afo_id)
as (
            select 1, 58, date '2018-02-01', 1, 0, 0, 0, 0, 11, 0, 0, 11, 2953773 from dual
  union all select 1, 58, date '2017-02-02', 1, null, 0, null, null, 39.85, null, null, null, null from dual
  union all select 1, 58, date '2018-02-01', 3, 345, 398, 0, 3467.25, 4052.01, 0, 0, 0, 2953774 from dual
  union all select 1, 58, date '2017-02-02', 3, null, 328, null, null, 3291.53, null, null, null, null from dual
  union all select 1, 58, date '2018-02-01', 5, 10, 16, 0, 140, 194.04, 0, 16, 60.9, 2953775 from dual
  union all select 1, 58, date '2017-02-02', 5, null, 7, null, null, 91.12, null, null, null, null from dual
  union all select 1, 58, date '2018-02-01', 7, 125, 151, 0, 1200, 1413.93, 0, 0, 0, 2953776 from dual
  union all select 1, 58, date '2017-02-02', 7, null, 112, null, null, 1063.89, null, null, null, null from dual
)

然后在2018年給出的范圍是：

AFO_ACTIVITY_ID AFO_SITE_ID AFO_FORECA AFO_SERVICE_ID AFO_PLANNED_CUSTOMERS AFO_REALIZED_CUSTOMERS AFO_GROUP_CUSTOMERS AFO_PLANNED_TURNOVER AFO_REALIZED_TURNOVER AFO_GROUP_TURNOVER AFO_NB_EMPLOYEES AFO_TURNOVER_EMPLOYEES     AFO_ID REAL_CUSTOMERS_PREVIOUS_YEAR REAL_TURNOVER_PREVIOUS_YEAR
--------------- ----------- ---------- -------------- --------------------- ---------------------- ------------------- -------------------- --------------------- ------------------ ---------------- ---------------------- ---------- ---------------------------- ---------------------------
              1          58 2018-02-01              3                   345                    398                   0              3467.25               4052.01                  0                0                      0    2953774                          328                     3291.53
              1          58 2018-02-01              7                   125                    151                   0                 1200               1413.93                  0                0                      0    2953776                          112                     1063.89
              1          58 2018-02-01              1                     0                      0                   0                    0                    11                  0                0                     11    2953773                            0                       39.85
              1          58 2018-02-01              5                    10                     16                   0                  140                194.04                  0               16                   60.9    2953775                            7                       91.12

並在2019年實現以下目標：

AFO_ACTIVITY_ID AFO_SITE_ID AFO_FORECA AFO_SERVICE_ID AFO_PLANNED_CUSTOMERS AFO_REALIZED_CUSTOMERS AFO_GROUP_CUSTOMERS AFO_PLANNED_TURNOVER AFO_REALIZED_TURNOVER AFO_GROUP_TURNOVER AFO_NB_EMPLOYEES AFO_TURNOVER_EMPLOYEES     AFO_ID REAL_CUSTOMERS_PREVIOUS_YEAR REAL_TURNOVER_PREVIOUS_YEAR
--------------- ----------- ---------- -------------- --------------------- ---------------------- ------------------- -------------------- --------------------- ------------------ ---------------- ---------------------- ---------- ---------------------------- ---------------------------
              1          58 2019-01-31              3                                                                                                                                                                                                            398                     4052.01
              1          58 2019-01-31              5                                                                                                                                                                                                             16                      194.04
              1          58 2019-01-31              1                                                                                                                                                                                                              0                          11
              1          58 2019-01-31              7                                                                                                                                                                                                            151                     1413.93

Answer 2

如果我理解正確，則可以使用FULL OUTER JOIN ：

SELECT 
    COALESCE(P.AFO_ACTIVITY_ID, P2.AFO_ACTIVITY_ID) as AFO_ACTIVITY_ID,
    COALESCE(P.AFO_SITE_ID, P2.AFO_SITE_ID) as AFO_SITE_ID, 
    P.AFO_FORECAST_DATE,
    P.AFO_SERVICE_ID,
    P.AFO_PLANNED_CUSTOMERS,
    P.AFO_REALIZED_CUSTOMERS,
    P.AFO_GROUP_CUSTOMERS,
    P.AFO_PLANNED_TURNOVER,
    P.AFO_REALIZED_TURNOVER,
    P.AFO_GROUP_TURNOVER,
    P.AFO_NB_EMPLOYEES,
    P.AFO_TURNOVER_EMPLOYEES,
    P.AFO_ID,
    p2.AFO_REALIZED_CUSTOMERS AS REAL_CUSTOMERS_PREVIOUS_YEAR,
    p2.AFO_REALIZED_TURNOVER  AS REAL_TURNOVER_PREVIOUS_YEAR
FROM (SELECT P.*
      FROM ACT_FORECAST P
      WHERE P.AFO_SITE_ID = :siteid AND
            P.AFO_ACTIVITY_ID = :activityid AND
            P.AFO_FORECAST_DATE BETWEEN :startdate AND :enddate
     ) P FULL JOIN
     (SELECT p2.*
      FROM act_forecast p2
      WHERE P2.AFO_SITE_ID = :siteid AND
            P2.AFO_ACTIVITY_ID = :activityid AND
            P2.AFO_FORECAST_DATE BETWEEN :startdate - 364 AND :enddate - 364
     ) p2
     ON p2.AFO_FORECAST_DATE = p.AFO_FORECAST_DATE - 364 AND
        p2.AFO_SITE_ID = p.AFO_SITE_ID AND
        p2.AFO_ACTIVITY_ID = p.AFO_ACTIVITY_ID AND
        p2.AFO_SERVICE_ID = p.AFO_SERVICE_ID

Answer 3

我很驚訝地看到- 364 （我的專業知識可能少於您的專業知識），並期望：

p.AFO_FORECAST_DATE - INTERVAL 364 DAY

也許這被解釋為（微）秒？

（典型的調試是通過省略部分條件，例如在AFO_FORECAST_DATE。）

Answer 4

像下面這樣使用東西：

    SELECT P.AFO_ACTIVITY_ID,
    P.AFO_SITE_ID,
    P.AFO_FORECAST_DATE,
    P.AFO_SERVICE_ID,
    P.AFO_PLANNED_CUSTOMERS,
    P.AFO_REALIZED_CUSTOMERS,
    P.AFO_GROUP_CUSTOMERS,
    P.AFO_PLANNED_TURNOVER,
    P.AFO_REALIZED_TURNOVER,
    P.AFO_GROUP_TURNOVER,
    P.AFO_NB_EMPLOYEES,
    P.AFO_TURNOVER_EMPLOYEES,
    P.AFO_ID,
    p2.AFO_REALIZED_CUSTOMERS AS REAL_CUSTOMERS_PREVIOUS_YEAR,
    p2.AFO_REALIZED_TURNOVER  AS REAL_TURNOVER_PREVIOUS_YEAR
    FROM ACT_FORECAST P
    LEFT OUTER JOIN(SELECT DISTINCT p2.AFO_FORECAST_DATE 
        FROM ACT_FORECAST P2)
    ON p2.AFO_FORECAST_DATE = p.AFO_FORECAST_DATE - 364
                    AND p2.AFO_SITE_ID = p.AFO_SITE_ID
                    AND p2.AFO_ACTIVITY_ID = p.AFO_ACTIVITY_ID
                    AND p2.AFO_SERVICE_ID = p.AFO_SERVICE_ID
WHERE 
    P.AFO_SITE_ID = :siteid
    AND P.AFO_ACTIVITY_ID = :activityid
    AND P.AFO_FORECAST_DATE BETWEEN :startdate AND :enddate