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Asked: 2026-05-31T18:18:48+00:00

I have a table withe different columns as shown below Ref Number Service Numbers

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I have a table withe different columns as shown below

 Ref Number Service Numbers Service type code   OpenDate    CurrentAppointDt    PreviousAppointDt   Time_Stamp  Lettert_created
78892   485992  78892TA 02/16/12    04/17/12    03/21/12    2/17/12 9:00 AM FALSE
78892   485992  78892TA 02/16/12    04/17/12    03/21/12    3/19/12 9:29 AM FALSE
78892   485992  78892TA 02/16/12    04/17/12    03/21/12    3/19/12 9:30 AM TRUE
78892   485992  78892TA 02/16/12    04/17/12    03/21/12    3/8/12 11:32 AM FALSE
78892   485992  78892TA 02/16/12    04/17/12    03/21/12    3/20/12 9:59 AM FALSE
94329   140055  94329   03/21/07    04/20/07    04/02/07    2/1/12 9:41 AM  FALSE
94329   140055  94329   03/21/07    04/20/07    04/02/07    3/21/07 10:00 AM    FALSE
94329   140055  94329   03/21/07    04/20/07    04/02/07    3/21/07 10:09 AM    FALSE
94329   140055  94329   03/21/07    04/20/07    04/02/07    3/22/07 11:21 AM    FALSE
94329   140055  94329   03/21/07    04/20/07    04/02/07    3/27/07 9:01 AM FALSE
94329   140055  94329   03/21/07    04/20/07    04/02/07    3/27/07 12:19 PM    FALSE
94329   140055  94329   03/21/07    04/20/07    04/02/07    12/2/11 12:55 PM    FALSE
107126  478952  107126TA    02/06/12    03/28/12    02/28/12    3/16/12 4:52 PM FALSE
107126  478952  107126TA    02/06/12    03/28/12    02/28/12    3/16/12 5:33 PM TRUE
107126  478952  107126TA    02/06/12    03/28/12    02/28/12    3/16/12 11:58 AM    FALSE
107126  478952  107126TA    02/06/12    03/28/12    02/28/12    3/14/12 2:09 PM FALSE
107126  478952  107126TA    02/06/12    03/28/12    02/28/12    2/24/12 2:00 PM FALSE
107126  478952  107126TA    02/06/12    03/28/12    02/28/12    2/24/12 12:15 PM    FALSE
107126  478952  107126TA    02/06/12    03/28/12    02/28/12    2/24/12 12:15 PM    FALSE

If I take the distinct values for the above Ref Number I get as follows 

78892                       
94329                       
107126

The time_stamp is always between CurrentAppointDT and PreviousAppointDt.
For these RefNumbers I need to see if the ‘Lettercreated’ is False/true.
I need the output as follows: 

Ref Number  Service Numbers Service type code   OpenDate    CurrentAppointDt    PreviousAppointDt   Lettert_created
78892   485992  78892TA 02/16/12    04/17/12    03/21/12    TRUE
94329   140055  94329   03/21/07    04/20/07    04/02/07    FALSE
107126  478952  107126TA    02/06/12    03/28/12    02/28/12    TRUE

Please help me if i can get a T-sql script in 1 select statement. It is a great help if any one can give me a solution.
Thank you.

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1 Answer

  1. Editorial Team

    It looks like you’re just looking for the case where the reference number has any record set to “True”, otherwise list it as “False”. If this is the case, try this:

    select Ref_Number, Service_Numbers, Service_type_code, OpenDate, CurrentAppointDt, PreviousAppointDt,
  case max(case when Lettert_created='True' then 1 else 0 end)
    when 1 then 'True'
    else 'False'
  end
from tbl
where time_stamp between CurrentAppointDT and PreviousAppointDt
group by Ref_Number, Service_Numbers, Service_type_code, OpenDate, CurrentAppointDt, PreviousAppointDt
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