Oracle SQL Query Help needed for below -

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i have table below :

id  ref num  type   time stamp ------------------------------ 1   456      x      time 1 2   456      y      updated timestamp 3   678      x      time 3 4   678      y      updated timestamp

i need in building query shall give me result below :

ref num    type time difference ------------------------------------ 456         x   (timestamp diff between type x , type y ref num) 678         y   (timestamp diff between type x , type y ref num)

you can conditional aggregation:

select t.refnum,        (max(case when type = 'x' timestamp end) -         max(case when type = 'y' timestamp end)        ) typetimestampdiff t group t.refnum;

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