Oracle SQL - Comparing Multiple Rows with Dates -

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i'm working in oracle sql. suppose have table lists following.

table 

purchaseid    custid      location       date       1            1                  8/23/2013 12:00:00       2            1           b        8/15/2013 12:00:00       3            2                  5/15/2013 12:00:00       4            2           b        1/01/2005 12:00:00       5            3                  1/15/2001 12:00:00       6            3                  1/30/2001 12:00:00       7            3           b        8/23/2013 12:00:00       8            4                  5/05/2012 12:00:00     9            4           b        8/15/2010 12:00:00     10           4                  9/20/2008 12:00:00

i'm trying write query compares purchases customer output every instance particular customer makes purchase @ 2 different locations within 2 years of each other. i'm getting particularly tripped on custid=3 , custid=4 type cases, there difficult combinations of location/date. output of query should this.

purchaseid    custid      location       date       1            1                  8/23/2013 12:00:00       2            1           b        8/15/2013 12:00:00        8            4                  5/05/2012 12:00:00     9            4           b        8/15/2010 12:00:00     10           4                  9/20/2008 12:00:00

in output, custid=1's purchases returned because in different locations within 2 years of each other. custid=2 thrown out because not within 2 years. custid=3 has 2 purchases within 2 years of each other, thrown out because in same location. , custid=4's purchases kept because purchases 8 , 9 within 2 years , in different locations, , 9 , 10 within 2 years , in different locations (i want these kept despite 8 , 10 being in same location , not within 10 years).

note: date column has oracle sql 'date' datatype.

as always, help/guidance appreciated.

you can limit search cases either next or previous location different current one. @ time difference choose rows.

this makes heavy use of lag() , lead():

select t.pruchaseid, t.custid, t.location, t.date (select t.*,              lag(location) on (partition custid order date) prevloc,              lead(location) on (partition custid order date) nextloc,              lag(date) on (partition custid order date) prevdate,              lead(date) on (partition custid order date) nextdate       t      ) t ((prevloc <> location) , (add_months(prevdate, 2*12) > date)) or       ((nextloc <> location) , (add_months(date, 2*12) > nextdate));

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