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Asked: 2026-06-04T00:43:05+00:00

I try to implement a query by using Between Clause,but there is some problem

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I try to implement a query by using Between Clause,but there is some problem in this

first query for S_E1:

this query return exact data which i require and here data count is 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 )

Second Query for S_E2:

this query return exact data which i require and here data count is 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 )

Problem :

But when i combine these to queries in a single query then it give wrong data.It gives me 73 rows.I think it should give 111 rows

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  )

Please give some idea where i am wrong here..

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1 Answer

  1. Editorial Team

    Use OR instead of 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 )

    In the query, it is not guaranteed that you will get 111 records because there may be common records for two conditions.

    condition 1 – ( S_E2 BETWEEN 10 AND 100 )

    condition 2 – ( S_E1 BETWEEN 10 AND 100 )

    Or

    Use Union All in two queries to get all records (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 )
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