Sql 在查询中正确地包含空值和联接

我使用的是OracleSQLDeveloper，我试图生成结果，其中包括按日期范围搜索的特定条件下的客户信息。我觉得我很接近，但我希望包括适用所有标准但尚未付款的账户

我的预期结果如下所示：

CYCLENUMB | WOCREATIONDATE | POSTINGDATE | CUSTOMERNUMBER | FIRSTNAME | LASTNAME | ADDRESS          | WOORDERTYPE | DESCRIPTION | PAYMENT
12        |  29-JUL-20     |  01-AUG-20  |  345506        |  Luke     | Skywalker| 123 Lakeway Dr.  | 636         |Completed    |  $100
24        |  01-AUG-20     |  07-AUG-20  |  456923        |  Leia     | Skywalker| 456 Lakeway Dr.  | 636         |Completed    |  $300
35        |  17-AUG-20     |  24-AUG-20  |  596854        |  Chewy    | Wookie   | 789 Lakeway Dr.  | 636         |Completed    |  NULL
80        |  21-AUG-20     |  28-AUG-20  |  695067        |  Han      | Solo     | 432 Wrongturn Dr.| 636         |Completed    |  NULL
66        |  25-AUG-20     |  30-AUG-20  |  235645        |  Count    | Dooku    | 534 Wrongturn Dr.| 636         |Completed    |  $225

但是我的结果就是这样

CYCLENUMB | WOCREATIONDATE | POSTINGDATE | CUSTOMERNUMBER | FIRSTNAME | LASTNAME | ADDRESS          | WOORDERTYPE | DESCRIPTION | PAYMENT
12        |  29-JUL-20     |  01-AUG-20  |  345506        |  Luke     | Skywalker| 123 Lakeway Dr.  | 636         |Completed    |  $100
24        |  01-AUG-20     |  07-AUG-20  |  456923        |  Leia     | Skywalker| 456 Lakeway Dr.  | 636         |Completed    |  $300
66        |  25-AUG-20     |  30-AUG-20  |  235645        |  Count    | Dooku    | 534 Wrongturn Dr.| 636         |Completed    |  $225

下面是我试图运行的查询

select customermaster.cyclenumber  as CYCLENUMB, 
   workorder.creationdate as WOCREATIONDATE,
   MAX(cushistory.postingdate) as POSTINGDATE,
   cushistory.customernumber as CUSTOMERNUMBER,
   customerpersonalinfo.firstname as FIRSTNAME,
   customerpersonalinfo.lastname as LASTNAME,
   premiseaddress.Concatenated_Address  as ADDRESS,
   workorder.ordertype as WOORDERTYPE,
   workorderstatus.description as DESCRIPTION,
   SUM(cushistory.moneysegment1) as PAYMENT
from   customermaster, workorder, customerpersonalinfo,
   (select
          premiseaddress.company  as  COMPANY,
          premiseaddress.premisenumber  as PREMISENUMBER,
          ((to_char(premiseaddress.currpremisestreetnumber) || ' ') || premiseaddress.currpremisestreetname)  as  Concatenated_Address
    from premiseaddress)
          premiseaddress, workorderstatus,  cushistory

where workorder.ordertype = 636
      and cushistory.moneytypecode1 = 7
      and workorder.application = 3
      and cushistory.postingdate between '01-Aug-20' and '31-Aug-20'
     and customermaster.customernumber = cushistory.customernumber
     and cushistory.customernumber = workorder.customernumber
     and customermaster.company = workorder.company
     and customermaster.accounttype = workorder.application
     and customermaster.customernumber = workorder.customernumber
     and workorder.application = workorderstatus.application
     and workorder.completecode = workorderstatus.workorderstatus
     and customermaster.company = customerpersonalinfo.company
     and customermaster.occupantcisnumber =customerpersonalinfo.cisnumber
     and customermaster.company = premiseaddress.company
     and  customermaster.premisenumber = premiseaddress.premisenumber
 GROUP BY customermaster.cyclenumber,
      workorder.wocreationdate ,
      cushistory.postingdate,
      customermaster.customernumber,
      customerpersonalinfo.firstname,
      customerpersonalinfo.lastname,
      premiseaddress.Concatenated_Address,
      workorder.ordertype,
      workorderstatus.description
  ORDER BY workorder.creationdate asc

我包含了一个子查询，用于简化客户地址。Postingdate from cushistory是我正在申请的日期范围文件管理器

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请注意，custhistory表是保存客户编号和付款的主表。我想将其与workorder表左连接，以包含空值，但还没有找到一种可靠的方法。

问题是您使用的是旧式隐式连接，即使用逗号分隔表，并在where子句中包含所有条件（join和filter）。这远远不是最佳实践，并导致您现在看到的问题。相反，在where子句中使用正确定义的联接（内部联接和左侧联接）和on子句作为联接条件，并使用筛选条件。这将给你你想要的结果。这澄清了事情谢谢你的建议。我已经尝试过重新构造查询，但是我仍然不太熟悉如何进行查询，以及哪些条件将进入哪个连接。还有，我将如何加入我的子查询？我可以建议查看一些关于加入的教程吗。。。我无法在评论中解释，也没有时间重新编写您的整个查询。加入条件通常只是您的PK/FK关系。以完全相同的方式联接子查询。但是有1000个示例和教程。是的，您使用的是SQL-89连接（那是lambada年吗？）。使用SQL-92联接要简单得多。请在代码问题中给出一个--cut&paste&runnable代码，包括作为代码输入的最小代表性示例；期望和实际输出（包括逐字记录错误消息）；标签和版本；清晰的说明和解释。尽可能少地给出代码，即显示为OK的代码，并通过显示为not OK的代码进行扩展。（调试基础。）用于包含DBMS和DDL（包括约束和索引）的SQL，并将其作为格式化为表的代码输入。在总体目标上暂停工作，在第一个表达中删去代码，不要给出你期望的，说出你期望的，为什么。