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update agents set tot_listing = 0
where tot_listing is null

update agents set tot_sell = 0
where tot_sell is null

update agents set tot_rent = 0
where tot_rent is null

update agents set price_min = 0
where price_min is null

update agents set price_end = 0
where price_end is null

update agents set price_avg = 0
where price_avg is null