Subtracting 1 month from a given date

i have a date in mm/dd/yyyy format.
the date is always the end of the month.
for example 7/31/2007
i need to figure out what was the date at the end of the previous month ( i.e 06/30 2008). in mm/dd/yyyy format

what is the oracl sql for this ?
nicoleheritageAsked:
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Guy Hengel [angelIII / a3]Billing EngineerCommented:
this should do:
SELECT ADD_MONTHS(your_date, -1) FROM yourtable

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Guy Hengel [angelIII / a3]Billing EngineerCommented:
note: you should better use the 1st of the month, and use yourfield < 1st_of_month.
also, you should have the date in DATE date type, and not in VARCHAR2 data type...
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