mysql replace in postgreSQL?

[blackwater dev <blackwaterdev@xxxxxxxxx>]

In MySQL, I can use the replace statement which either updates the
data there or inserts it.  Is there a comporable syntax to use in
postgreSQL?

I need to do an insert and don't want to have to worry about if the
data is already there or not...so don't want to see if it there, if so
do update if not insert...etc.

Thanks.

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