sql

i need to write a basic SQL, taking user parameter (financial year) in the
form of e.g. 2006/2007 and from that I need to extract the data for last
year 2005/2006. the 2006/2007 comes from a column in the form or string
varchar2. how can I get previous years from that entry

select year from year
where year = 'year - 1'

select year from year
where year = '2006/2007 - 1'
is this correct
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Received on Monday, 6 August 2007 11:59:59 UTC