[GENERAL] How to create recurrence schedule event?

[Quang Thoi]

Hi,

I am trying to port sybase codes to posgresql. I have looked into the 
postgresql documentation
but couldn't find good information on how to  create an equivalent recurrence 
event
which similar to the sybase codes below.

Can some one please help?

sybase codes:

create event PURGE_ORDER schedule
start time '00:00:00' every 30 minutes
       on ( 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday','Saturday', 
'Sunday' )

handler begin

     declare @value           varchar(128);
     call cleanup_order();
end;

Thanks,
QT