Period To Date Function

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From: MANDLA MKHWANAZI (mandlam_at_avision.co.za)
Date: 08/12/04 

Date: Thu, 12 Aug 2004 09:56:31 +0200

When looking at the SQL online books the Period To Date Function Topic is
disable and would like to see what this function does, cause i am looking in
to calculation the sales figures in SQL using the Period To Date Function
and The Year To Date, but both this functions are disable, is there a way
that i a can be able to see functions?