is there any difference between dates

• dastagiri16

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  July 11, 2012 at 9:34 pm

  #261096

  hi,

  i have two statements as below

  select * From doctor_list where doctor_registered_date between '2012-05-01' and '2012-05-02'

  and

  select * From doctor_list where doctor_registered_date between '2012-05-01 00:00:00' and '2012-05-02 00:00:00'

  is there any difference between there results ?

  Thanks,

  Dastagiri

• Lynn Pettis

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  July 11, 2012 at 10:02 pm

  #1511854

  dastagiri16 (7/11/2012)

  ---

  hi,

  i have two statements as below

  select * From doctor_list where doctor_registered_date between '2012-05-01' and '2012-05-02'

  and

  select * From doctor_list where doctor_registered_date between '2012-05-01 00:00:00' and '2012-05-02 00:00:00'

  is there any difference between there results ?

  Thanks,

  Dastagiri

  Depends on the datatype of doctor_registered_date and the possibly the data stored.

• GSquared

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  July 12, 2012 at 10:42 am

  #1512181

  Considering implicit conversion will take place if the column datatype isn't DateTime, no, there isn't a real difference between the two, and they should get the same results.

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• CapnHector

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  July 12, 2012 at 1:15 pm

  #1512272

  depending on how much accuracy you want to imply in your code would be which one i would choose. they are both the same once the implicit conversion occurs but depending on the application it may be better to use '2012-05-12 00:00:00' to signify in your code you explicitly mean midnight.

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• Kumara1011

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  July 13, 2012 at 4:12 am

  #1512436

  its depends on the data type for that column.

  for example: If it is a datetime then it will not show much difference.

  or else if it is a nvarchar its shows u much difference.

• Jeff Moden

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  July 13, 2012 at 7:22 am

  #1512522

  dastagiri16 (7/11/2012)

  ---

  hi,

  i have two statements as below

  select * From doctor_list where doctor_registered_date between '2012-05-01' and '2012-05-02'

  and

  select * From doctor_list where doctor_registered_date between '2012-05-01 00:00:00' and '2012-05-02 00:00:00'

  is there any difference between there results ?

  Thanks,

  Dastagiri

  There's no difference. They both allow you to return the wrong data depending on whether your stored dates have times on them or not.

  If the intent of the your code is to return ALL dates from the 1st to the 2nd, then to account for the possibility of a time coming into the data, you need to change the code to handle possible times. The general form for that is...

  WHERE SomeColumn >= @StartDate and SomeColumn < DATEADD(dd,1,@EndDate)

  --Jeff Moden

  ---

  RBAR is pronounced "ree-bar" and is a "Modenism" for Row-By-Agonizing-Row.
  First step towards the paradigm shift of writing Set Based code:
  ________Stop thinking about what you want to do to a ROW... think, instead, of what you want to do to a COLUMN.
  "Change is inevitable... change for the better is not".
  

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