SELECT max(date) as date from ( select max(date) as date from crprp union all select max(date) as date from pouring union all select max(date) as date from product ) as dataMartinaJ
>SELECT data.date >from ( >select max(date)as date from crprp >union all >select max(date)as date from pouring >union all >select max(date)as date from product >) as data >group by data.date >>