Analytical functions in db2

A table has accountnumbers, status codes and effective dates. I need to get accountnumbers, status codes and effdates which has statuscode = ' 5' and also statuscode ='F' or statuscode = 's' before having statuscode = '5'. These account numbers should have had statuscode= 'F' or statuscode = 's' before statuscode = '5'.

What is the best way to write the query. Please suggest
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Select account number, effdate
From table1 p
Where status code='5'
And exists (select 1 from table1
   Where accountnumber = p.account number and effdate < p.effdate and status code in ('f', 's'))

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It makes no sense to say "which has statuscode = ' 5' and also statuscode ='F'" nor to say "statuscode = 's' before having statuscode = '5'". Much more detail is needed.

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