Question

I am trying to run the following query :

SELECT  
  A.STEPNAME, 
  A.BRDATE BRDATE_A, 
  B.BRDATE BRDATE_B, 
  MIN(A.STARTTIME) STARTTIME_A, 
  MAX(A.ENDTIME) ENDTIME_A, 
  MIN(B.STARTTIME) STARTTIME_B, 
  MAX(B.ENDTIME) ENDTIME_B, 
  'RUNTIME_A' = convert(VARCHAR,DATEDIFF(MINUTE,A.STARTTIME,A.ENDTIME),108) ,
  'RUNTIME_B' = convert(VARCHAR,DATEDIFF(MINUTE,B.STARTTIME,B.ENDTIME),108) 
FROM 
  CB_OPX_AUDIT_HIST A, 
  CB_OPX_AUDIT_HIST B
WHERE  
  A.BRDATE = ('05/11/2012') 
AND 
  B.BRDATE = ('05/16/2012') 
AND 
  A.BR = '03'
AND 
  A.STEPNAME=B.STEPNAME
AND 
  A.BR=B.BR
GROUP BY 
  A.STEPNAME, 
  A.ENDTIME, 
  A.STARTTIME,
  A.BRDATE,
  B.BRDATE,
  B.ENDTIME, 
  B.STARTTIME
ORDER BY  
  A.STARTTIME

I need the difference between ‘RUNTIME_A’ AND ‘RUNTIME_B’ ..

Can someone tell me how do i get the difference in the above query.?

Answer 1

For simplicity, I would suggest just changing from using VARCHAR to using DATETIME and run a simple datediff again

DATEDIFF(MINUTE, 
    convert(DATETIME,DATEDIFF(MINUTE,A.STARTTIME,A.ENDTIME),108), 
    convert(DATETIME,DATEDIFF(MINUTE,B.STARTTIME,B.ENDTIME),108)
)

You can wrap your original query as a subquery to simplify things.