query based on row number for psql8.3

From: Emi <emilu(at)encs(dot)concordia(dot)ca>
To: pgsql-sql(at)postgresql(dot)org
Subject: query based on row number for psql8.3
Date: 2016-03-23 18:00:36
Message-ID: 56F2D9C4.9010304@encs.concordia.ca
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Hello,

For psql8.3, is there a simple way to query based on row number please?

For example,

select case
when row_num=1 THEN t1.tot_hr
ELSE t1.tot_hr -
t1.pre_hr
END
FROM t1 ;

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