Oracle SQL 循环遍历日期范围

我正在尝试编写一个执行以下操作的查询：

• 从 Visit 表中获取 Start_Date 和 End_Date
• 对于日期范围内包含的每个日期，搜索遭遇表 查看特定提供者在该日期是否看过患者
• 生成一个表格，显示每个日期以及谁在该日期见过该患者 日期。
• Notes:
• 患者可能在该日期没有见过，这应该导致 NULL 或类似的结果
• 在某个日期可能有不止一位提供者看过患者，这会导致该日期有不止一条线路。

简化示例：
开始日期：2015 年 1 月 1 日
结束日期：2015 年 1 月 4 日

期望的输出：

╔══════╦══════════╦═══════╦═══════╗
║  ID  ║   DATE   ║ NAME  ║ TYPE  ║
╠══════╬══════════╬═══════╬═══════╣
║ 2222 ║ 1-Jan-15 ║ Smith ║ Note  ║
║ 2222 ║ 2-Jan-15 ║ Jones ║ Note  ║
║ 2222 ║ 2-Jan-15 ║ Smith ║ Order ║
║ 2222 ║ 3-Jan-15 ║ NULL  ║       ║
║ 2222 ║ 4-Jan-15 ║ Jones ║ Note  ║
╚══════╩══════════╩═══════╩═══════╝

这是我到目前为止所得到的。这会生成这些特定提供者何时见到患者的列表，但对于那些未见到患者的日期，它不会导致 NULL。

SELECT V.VISIT_ID, ET.ENCOUNTER_TRANSACTION_DATE, P.NAME_LAST, ETT.ENC_TRANS_TYPE_NAME
FROM VISIT V
RIGHT OUTER JOIN ENCOUNTER_TRANSACTION ET ON V.VISIT_ID = ET.VISIT_ID AND V.INSTITUTION_ID = ET.INSTITUTION_ID
INNER JOIN ENCOUNTER_TRANSACTION_TYPE ETT ON ET.ENCOUNTER_TYPE_ID = ETT.ENCOUNTER_TRANSACTION_TYPE_ID
INNER JOIN LOCAL_PROVIDER LP ON ET.ORDERING_PROVIDER_ID = LP.LOCAL_PROVIDER_ID
INNER JOIN PERSON_IDENTIFIER I ON I.IDENTIFIER = LP.PROVIDER_NUMBER AND I.IDENTIFIER_SYS_ID = LP.PROVIDER_NUMBER_SYS_ID  
INNER JOIN PERSON P ON P.PERSON_ID = I.PERSON_ID
WHERE
  V.INSTITUTION_ID = 1 AND
  V.END_DATE IS NOT NULL AND
  V.VOIDED_YN = 'N' AND
  V.CARE_SETTING_CODE = 'I' AND
  V.PATIENT_TEAM_ID IN (16, 17, 18) AND
  V.START_DATE >= (TRUNC(ADD_MONTHS(CURRENT_DATE, -1),'mon')) AND
  V.START_DATE <= (LAST_DAY(ADD_MONTHS(CURRENT_DATE, -1))) AND
  I.IDENTIFIER IN (
    '1234', --Smith
    '4321', --Jones
  )
ORDER BY V.VISIT_ID ASC, ET.ENCOUNTER_TRANSACTION_DATE ASC;

当前输出（缺少 2015 年 1 月 3 日的 NULL 行）：

╔══════╦══════════╦═══════╦═══════╗
║  ID  ║   DATE   ║ NAME  ║ TYPE  ║
╠══════╬══════════╬═══════╬═══════╣
║ 2222 ║ 1-Jan-15 ║ Smith ║ Note  ║
║ 2222 ║ 2-Jan-15 ║ Jones ║ Note  ║
║ 2222 ║ 2-Jan-15 ║ Smith ║ Order ║
║ 2222 ║ 4-Jan-15 ║ Jones ║ Note  ║
╚══════╩══════════╩═══════╩═══════╝

以下是获取日期范围的方法：

 SELECT DATE'2015-01-01' + LEVEL - 1
   FROM dual
CONNECT BY DATE'2015-01-01' + LEVEL - 1 < DATE'2015-02-01';

上面将获取2015年1月1日到2015年1月31日范围内的所有日期。

使用上述内容，您可以做的是插入开始日期和结束日期并创建 CTE，然后在日期上使用外部联接：

WITH dr AS (
    SELECT DATE'2015-01-01' + LEVEL - 1 AS transaction_date
      FROM dual
   CONNECT BY DATE'2015-01-01' + LEVEL - 1 < DATE'2015-01-04'
)
SELECT V.VISIT_ID, dr.transaction_date
     , P.NAME_LAST, ETT.ENC_TRANS_TYPE_NAME
...
       ENCOUNTER_TRANSACTION ET RIGHT JOIN dr
    ON ET.ENCOUNTER_TRANSACTION_DATE = dr.transaction_date

UPDATE我花了一些时间，我想我明白了如何将上述内容集成到您的查询中。我确实没有 SQL Fiddle 的示例数据（无论如何你都有很多表）。您可以从这里开始，这应该获得所有适当的访问以及访问日期范围内的每个日期（假设没有访问超过 30 天 - 相应调整）：

WITH dr AS (
    SELECT LEVEL AS dd FROM dual
   CONNECT BY LEVEL <= 30 -- I'm assuming a max date range of 30; increase as you see fit
)
SELECT v.visit_id, v.start_date - 1 + dr.dd AS encounter_transaction_date
     , p.name_last, ett.enc_trans_type_name
  FROM visit v CROSS JOIN dr
 WHERE v.start_date - 1 + dr.dd < TRUNC(v.end_date) + 1
   AND v.institution_id = 1
   AND v.end_date IS NOT NULL
   AND v.voided_yn = 'N'
   AND v.care_setting_code = 'I'
   AND v.patient_team_id IN (16,17,18)
   AND v.start_date >= TRUNC(ADD_MONTHS(CURRENT_DATE, -1), 'MONTH')
   AND v.end_date < TRUNC(CURRENT_DATE, 'MONTH');

那么我认为你的外连接应该是从那里开始的 LEFT JOIN（至少，如果我理解正确的话，我可能不会：

WITH dr AS (
    SELECT LEVEL AS dd FROM dual
   CONNECT BY LEVEL <= 30 -- I'm assuming a max date range of 30; increase as you see fit
)
SELECT v.visit_id, v.start_date - 1 + dr.dd AS encounter_transaction_date
  FROM visit v CROSS JOIN dr
  LEFT JOIN encounter_transaction et
    ON v.visit_id = et.visit_id
   AND v.institution_id = et.institution_id
   AND TRUNC(v.start_date - 1 + dr.dd) = et.encounter_transaction_date
  LEFT JOIN encounter_transaction_type ETT
    ON et.encounter_type_id = ett.encounter_transaction_type_id
  LEFT JOIN local_provider lp
    ON et.ordering_provider_id = lp.local_provider_id
  LEFT JOIN person_identifier i
    ON i.identifier = lp.provider_number
   AND i.identifier_sys_id = lp.provider_number_sys_id
   AND i.identifier IN (
       '1234', --Smith
       '4321' --Jones ** you had an extra comma here!
)
  LEFT JOIN person p
    ON p.person_id = i.person_id
 WHERE v.start_date - 1 + dr.dd < TRUNC(v.end_date) + 1
   AND v.institution_id = 1
   AND v.end_date IS NOT NULL
   AND v.voided_yn = 'N'
   AND v.care_setting_code = 'I'
   AND v.patient_team_id IN (16,17,18)
   AND v.start_date >= TRUNC(ADD_MONTHS(CURRENT_DATE, -1), 'MONTH')
   AND v.start_date < TRUNC(CURRENT_DATE, 'MONTH');