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How to use sub-query result to create new field and set value?

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Contributor zz
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Posts: 28
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How to use sub-query result to create new field and set value?

I have a sub-query as follows:

 

(SELECT D2.DSDECODED FROM DS_02 D2 WHERE D2.DSDECODED ="TREATMENT UNBLINDED" AND D.USUBJID=D2.USUBJID) AS DECODE

 

How do I program so, instead of DECODE taking the value of D2.DSDECODED(TREATMENT UNBLINDED), it now takes the value of either "YES", when D2.DSDECODED ="TREATMENT UNBLINDED", or

"NO", when D2.DSDECODED ="TREATMENT UNBLINDED" is false

 

Thank you in advance for your help!


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‎09-28-2016 01:16 PM
Frequent Contributor
Posts: 123

Re: How to use sub-query result to create new field and set value?

[ Edited ]

Maybe you could use a CASE statement? Although I'm not sure why you have WHERE D2.DSDECODED ="TREATMENT UNBLINDED". Don't you want to include records that aren't DSDECODED="TREATMENT UNBLINDED". In that case you could do something like this:

 

(SELECT 
  (CASE
    WHEN D2.DSDECODED="TREATMENT UNBLINDED" THEN "YES"
    ELSE "NO"
  END) AS DECODE
FROM DS_02 D2 WHERE D.USUBJID=D2.USUBJID)

 

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Solution
‎09-28-2016 01:16 PM
Frequent Contributor
Posts: 123

Re: How to use sub-query result to create new field and set value?

[ Edited ]

Maybe you could use a CASE statement? Although I'm not sure why you have WHERE D2.DSDECODED ="TREATMENT UNBLINDED". Don't you want to include records that aren't DSDECODED="TREATMENT UNBLINDED". In that case you could do something like this:

 

(SELECT 
  (CASE
    WHEN D2.DSDECODED="TREATMENT UNBLINDED" THEN "YES"
    ELSE "NO"
  END) AS DECODE
FROM DS_02 D2 WHERE D.USUBJID=D2.USUBJID)

 

Contributor zz
Contributor
Posts: 28

Re: How to use sub-query result to create new field and set value?

Posted in reply to JediApprentice

Hi JediApprentice,

 

Thank you for the below suggestion!  The logic worked the way you have it.  

 

In terms of condition WHERE D2.DSDECODED ="TREATMENT UNBLINDED", if I have it, the code works to only set "YES" for the "DECODE" Flag, if removed, it evaluates to more than one row, breaking the code.

 

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