Question

我尝试使用Between Clause实现查询，但是这个

存在一些问题

首先查询S_E1：

此查询返回我需要的确切数据，此处数据计数为43。

select RECORD_TIMESTAMP as DateRecorded, ROUND (S_E1 ,2 )as S_E1
from TBL_SENSORS
Where RECORD_TIMESTAMP Between '4/28/2012 12 :00 AM' 
                           and '5/17/2012 12 :00 AM'
And ( S_E1 Between 10 And 100 )

S_E2的第二个查询：

此查询返回我需要的确切数据，此处数据计数为68。

select RECORD_TIMESTAMP as DateRecorded, ROUND (S_E2 ,2 )as S_E2
from TBL_SENSORS
Where RECORD_TIMESTAMP Between '4/28/2012 12 :00 AM'
                           and '5/17/2012 12 :00 AM'
And ( S_E2 Between 10 And 100 )

问题：

但是当我在单个查询中将它们组合到查询中时，它会给出错误的数据。它给了我73行。我认为它应该给出111行

select RECORD_TIMESTAMP as DateRecorded, 
       ROUND (S_E2 ,2 )as S_E2, 
       ROUND (S_E1 ,2 ) as S_E1
from TBL_SENSORS
Where RECORD_TIMESTAMP Between '4/28/2012 12 :00 AM'
                           and '5/17/2012 12 :00 AM'
And ( S_E2 Between 10 And 100) 
and (S_E1 Between 10 And 100  )

请在这里说明我错在哪里..

Answer 1

使用OR代替AND opeartor

SELECT RECORD_TIMESTAMP AS DateRecorded, 
       Round (S_E2, 2)  AS S_E2, 
       Round (S_E1, 2)  AS S_E1 
FROM   TBL_SENSORS 
WHERE  RECORD_TIMESTAMP BETWEEN '4/28/2012 12 :00 AM' AND '5/17/2012 12 :00 AM' 
       or ( S_E2 BETWEEN 10 AND 100 ) 
       or ( S_E1 BETWEEN 10 AND 100 )

在查询中，不保证您将获得111条记录，因为可能存在两种情况的共同记录。

条件1 - ( S_E2 BETWEEN 10 AND 100 )

条件2 - ( S_E1 BETWEEN 10 AND 100 )

或者

在两个查询中使用Union All来获取所有记录（111）。

select RECORD_TIMESTAMP as DateRecorded, ROUND (S_E1 ,2 )as S_E1, 0 as S_E2
from TBL_SENSORS
Where RECORD_TIMESTAMP Between '4/28/2012 12 :00 AM' and '5/17/2012 12 :00 AM'
And ( S_E1 Between 10 And 100 )

UNION ALL

select RECORD_TIMESTAMP as DateRecorded, 0 as S_E1, ROUND (S_E2 ,2 ) as S_E2
from TBL_SENSORS
Where RECORD_TIMESTAMP Between '4/28/2012 12 :00 AM'
and '5/17/2012 12 :00 AM'
And ( S_E2 Between 10 And 100 )

Answer 2

我认为您应该在两个陈述之间建立联盟，或者您应该使用“OR”代替AND。

select RECORD_TIMESTAMP as DateRecorded,ROUND (S_E2 ,2 )as S_E2,ROUND (S_E1 ,2 )as S_E1 from TBL_SENSORS Where RECORD_TIMESTAMP Between '4/28/2012 12 :00 AM' and '5/17/2012 12 :00 AM' AND (( S_E2 Between 10 And 100) OR(S_E1 Between 10 And 100 ))

Answer 3

问题在于S_E2和S_E1的限制。

为了让他们按照预期的方式工作，您必须使用UNION ALL：

select RECORD_TIMESTAMP as DateRecorded, ROUND (S_E1 ,2 )as S_E
from TBL_SENSORS
Where RECORD_TIMESTAMP Between '4/28/2012 12 :00 AM' and '5/17/2012 12 :00 AM'
And ( S_E1 Between 10 And 100 )

UNION ALL

select RECORD_TIMESTAMP as DateRecorded, ROUND (S_E2 ,2 )as S_E
from TBL_SENSORS
Where RECORD_TIMESTAMP Between '4/28/2012 12 :00 AM'
and '5/17/2012 12 :00 AM'
And ( S_E2 Between 10 And 100 )

或者您使用OR代替AND，如下所示：

select RECORD_TIMESTAMP as DateRecorded, 
       ROUND (S_E2 ,2 )as S_E2, 
       ROUND (S_E1 ,2 ) as S_E1
from TBL_SENSORS
Where RECORD_TIMESTAMP Between '4/28/2012 12 :00 AM'
                           and '5/17/2012 12 :00 AM'
And ( (S_E2 Between 10 And 100) OR (S_E1 Between 10 And 100)  )

由于限制的唯一区别来自S_E1和S_E2列，如果您使用AND，则表示所有记录都必须遵守这两个限制。在分离的查询中，他们只尊重一个，所以你必须在主查询中这样做。

Answer 4

通过放置额外的括号并将最后一个AND替换为OR

来更改布尔逻辑

select RECORD_TIMESTAMP as DateRecorded, 
       ROUND (S_E2 ,2 )as S_E2, 
       ROUND (S_E1 ,2 ) as S_E1
from TBL_SENSORS
Where RECORD_TIMESTAMP Between '4/28/2012 12 :00 AM'
                           and '5/17/2012 12 :00 AM'
And (( S_E2 Between 10 And 100) 
OR (S_E1 Between 10 And 100  ))

Sql介于多个列的子句之间

4 个答案: