sql - subtract values in different columns and different rows -

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i have 1 table following values:

job name       start_dt         end_dt gggggg         4/5/2013        5/5/2013 iiiii            6/5/13          7/8/13

i want subract start_dt of gggggg end_dt of iiiii.

i using query:

select a.job_nm,(b.end_dt-a.start_dt) difference job a,b a.job_nm='ggggg' , b.job_nm='iiiii'.

this giving me no output.

if sql server can use datediff():

select a.job_nm, datediff(day, a.start_dt, b.end_dt) [difference] job a,b a.job_nm='ggggg' , b.job_nm='iiiii'

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