Question

我很困惑的简单查询。我正在尝试过滤出以4120结尾的工作，依此类推。当我运行此查询

select Job.Job, Job.Status from Job 
    Where(Job.Job Not Like '%4120'
          And Job.Job Not Like '%4235'
          And Job.Job Not Like '%4236'
          And Job.Job Not Like '%5910'
          And Status = 'Active' OR Status = 'Complete') 
    Order By Job.Job

我得到这些结果

    Job         Status
    01-19-4120  Complete
    01-19-4235  Complete
    01-19-5910  Complete
    02-19-4120  Complete
    02-19-4235  Complete
    02-19-4236  Complete
    02-19-5910  Complete
    03-07-4120  Complete
    03-19-4120  Complete
    03-19-4235  Complete
    03-19-5910  Complete
    04-19-4120  Complete
    04-19-4160  Complete

我的查询出问题了吗？

Answer 1

您有一个逻辑上的先发问题。我高度怀疑您应该在OR条件下加上括号，如下所示：

Job.Job Not Like '%4120'
And Job.Job Not Like '%4235'
And Job.Job Not Like '%4236'
And Job.Job Not Like '%5910'
And (Status = 'Active' OR Status = 'Complete')

说明：由于逻辑运算符OR的优先级比AND低，因此您的WHERE条件实际上等于：

(
    Job.Job Not Like '%4120'
    And Job.Job Not Like '%4235'
    And Job.Job Not Like '%4236'
    And Job.Job Not Like '%5910'
    And Status = 'Active' 
) OR Status = 'Complete'

这将允许Status为'Complete'的任何记录，而与Job的值无关，这不是您想要的。

此外，请注意，可以通过使用字符串函数而不是Not Like和in条件而不是Or来简化这些条件。假设您的RDBMS支持right()：

right(Job.Job, 4) not in ('4120', '4235', '4236', '5910') 
and Status in ('Complete', 'Active')

Answer 2

您需要在Status = 'Active' OR Status = 'Complete'周围加上括号，因为现在您的查询执行为：

WHERE (Job.Job Not Like '%4120'
          And Job.Job Not Like '%4235'
          And Job.Job Not Like '%4236'
          And Job.Job Not Like '%5910'
          And Status = 'Active') OR (Status = 'Complete')

因此，无论Status = 'Complete'为何，您都将获得Job.Job处的所有记录。要解决此问题，请尝试在状态检查周围添加括号：

Where(Job.Job Not Like '%4120'
      And Job.Job Not Like '%4235'
      And Job.Job Not Like '%4236'
      And Job.Job Not Like '%5910'
      And (Status = 'Active' OR Status = 'Complete'))

Answer 3

这是一个括号问题。通过在括号内加入OR，您的意思是“让我将所有与这些字符串匹配且状态为活动或状态为完整的东西-匹配与您的其他条件不匹配的记录。

select Job.Job, Job.Status from Job 
    Where(Job.Job Not Like '%4120'
          And Job.Job Not Like '%4235'
          And Job.Job Not Like '%4236'
          And Job.Job Not Like '%5910')
    And (Status = 'Active' OR Status = 'Complete') 
Order By Job.Job

Answer 4

如果是sql server，请尝试以下操作：

select Job.Job, Job.Status from Job 
    Where right(rtrim(Job.Job),4) Not in ('4120','4235','4236','5910')
          And Status = 'Active' OR Status = 'Complete') 
    Order By Job.Job

Answer 5

如果使用in，则不需要括号：

Where Job.Job Not Like '%4120' and
      Job.Job Not Like '%4235' and
      Job.Job Not Like '%4236' and
      Job.Job Not Like '%5910' and
      Status in ('Active', 'Complete')

或者，如果您的数据库支持left()作为字符串函数：

where left(Job.Job, 4) not in ('4120', '4235', '4236', '5910') and
      Status in ('Active', 'Complete')

查询不喜欢返回奇怪的结果

5 个答案: