Sql 同一表上的左外部联接返回0条记录

我已经在其他帖子上搜索了我的问题，但没有任何效果

我有一个表，其中包含了餐厅的客户和营业额预测数据，计划值和实现值都在同一个表中（必须与以前的数据库保持相同）

我需要获得某一特定餐厅（现场）和特定活动（餐厅、外卖、点击n收集）以及某一日期范围（通常为一个月）去年的计划预测和实现预测

我的问题是，当计划的预测不存在，并且上一年实现的预测存在时，请求不返回任何内容

这是我的要求：

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月的请求，我有我的数据（2018年和2017年）

但是如果我在2019年2月玩，我什么都没有，今年计划的部分也可以，因为预测还没有完成，但对于上一年的部分，我应该有一些数据

---

我也试过右外接，但没有成功

样本数据：

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

有什么想法吗

---

关于

我惊讶地看到

-364

（我的专业知识可能比不上你），并期望：

p.AFO_FORECAST_DATE - INTERVAL 364 DAY

也许这被解释为（微）秒

---

（典型的调试是省略部分条件，如AFO_FORECAST_DATE上的条件。）

我惊讶地看到

-364

（我的专业知识可能比你的少），并期望：

p.AFO_FORECAST_DATE - INTERVAL 364 DAY

也许这被解释为（微）秒

---

（典型的调试是省略部分条件，如AFO_FORECAST_DATE。）

使用以下内容：

    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

---

使用下面这样的东西：

    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

---

您的

where

子句仅在指定范围内的

p

中查找记录。如果没有，则没有要从中进行左外部联接的源行

您可以通过内联视图或CTE生成所查看期间的所有可能日期，然后查找与以下任一组日期匹配的记录：

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;

尽管您可能需要比

CTE

更具描述性的名称（使用任一版本…）

---

将样本数据作为CTE重新处理，问题中未显示的值为空：

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年的范围内：

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

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

2019年的范围为：

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

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

---

您的

where

子句仅在指定范围内的

p

中查找记录。如果没有，则没有要从中进行左外部联接的源行

您可以通过内联视图或CTE生成所查看期间的所有可能日期，然后查找与以下任一组日期匹配的记录：

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;

尽管您可能需要比

CTE

更具描述性的名称（使用任一版本…）

---

将样本数据作为CTE重新处理，问题中未显示的值为空：

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年的范围内：

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

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

2019年的范围为：

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

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

---

如果我理解正确，您可以使用

完全外部联接

：

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

---

如果我理解正确，您可以使用

完全外部联接

：

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

---

---

添加一些示例表数据和预期结果-作为格式化文本，而不是图像。但是首先看一看，

where子句

与任何内容都不匹配，因此没有

P

行从左连接。如果存在匹配的

P

行，但没有匹配的

P2

行，则外部联接将返回数据。我尝试使用右外部联接使P2匹配行，但它不返回任何内容。我们仍然需要样本数据来建议更好的方法。目前尚不清楚您搜索的时间段有多大，也不清楚您是在查找前一年同一时间段的所有数据，还是只查找恰好匹配的天数（这是您现在看到的）。添加了示例，对于延迟表示抱歉。一个月内，我最多可以有124行（每天4个服务），但该表包含当前年份和2年存档的所有餐厅的数据。添加一些示例表数据和预期结果-作为格式化文本，而不是图像。但是首先看一看，

where子句

与任何内容都不匹配，因此没有

P

行从左连接。如果存在匹配的

P

行，但没有匹配的

P2

行，则外部联接将返回数据。我尝试使用右外部联接使P2匹配行，但它不返回任何内容。我们仍然需要样本数据来建议更好的方法。目前尚不清楚您搜索的时间段有多大，也不清楚您是在查找前一年同一时间段的所有数据，还是只查找恰好匹配的天数（这是您现在看到的）。添加了示例，对于延迟表示抱歉。对于一个月，我最多可以有124行（每天4个服务），但该表包含了当前年份和2年存档的所有餐厅的数据。其中-364用于比较前一年的同一天（例如周一和周一）。解释很好，在这里附近的某个地方发现了窍门^^间隔1年并不更合适。但是，谢谢你，我学到了一些东西（我希望永远都不需要），我把错误的答案留给了其他人，让他们不要犯同样的错误。Oracle date算术使用天数，所以-364比这早了很多天。您的interval版本是等效的、更简洁的，在Oracle中也可以使用。interval 1年：2018年2月1日星期二->2017年2月1日星期三-364年：2018年2月1日星期二->2017年2月2日星期二我需要第二个版本来比较一个人可以做的相同“天”

-interval 1年+interval 1天

，但我明白了。然而，二月前后的闰年让我提到了年份，-364用于比较前一年的同一天（例如周一和周一）。解释很好，在这里附近的某个地方发现了窍门^^间隔1年并不更合适。但是谢谢，我学到了一些东西（我希望永远都不需要），我把错误的答案留给别人，让他们不要犯同样的错误