isnull() function in pgAdmin3

Hi,

I am trying to emulate the isnull() function used in MySQL into postreSQL. I
have tried different ways such is null but it's not producing the results
desired. I am doing a data migration from MySQL into postgreSQL and need
help with the isnull() in pgAdmin3.

Any assistance provided would be greatly appreciated.

Thanks,

In MySQL:

(case
            when
                ((`s`.`Funding_Date` = '')
                    and (isnull(`s`.`Actual_Close_Date`)
                    or (`s`.`Actual_Close_Date` = '')))
            then
                'RPG_INV'
            when
                ((isnull(`s`.`Funding_Date`)
                    or (`s`.`Funding_Date` <> ''))
                    and ((`s`.`Actual_Close_Date` = '')
                    or isnull(`s`.`Actual_Close_Date`)))
            then
                'Builder_Inventory'
            else 'Owner_Inventory'
        end) AS `Lot_Status`,



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