查询不喜欢返回奇怪的结果

Question

我被难住了的简单查询。我正在尝试过滤掉以 4120 等结尾的作业。当我运行这个查询

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

我的查询有问题吗？

Answer 1

你的逻辑存在问题。我高度怀疑您应该用括号将 ORed 条件括起来，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')

解释：由于逻辑运算符 OR 的优先级低于 AND，因此您的 WHERE 条件实际上等同于：

(
    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'

这允许 Status 为 'Complete' 的任何记录，而不管 Job 的值，这不是您想要的。

此外，请注意，应该可以通过使用字符串函数而不是 Not Likes 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

您的 Status = 'Active' OR Status = 'Complete' 需要括号，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 Job.Job 是什么，您都将获得 Status = 'Complete' 处的所有记录。要解决此问题，请尝试在您的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。通过将 OR 包含在括号内，您的说法是“给我所有匹配这些字符串且状态为活动或状态为完整的东西 - OR 将匹配不符合您的其他条件的记录。

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 sql 服务器试试这个：

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

Query Not Like returning odd results

sql

string

select

where-clause

sql-like