Nevim jak na MySQL, ale pro MS SQL by to vypadalo takto
UPDATE t1 SET t1.spracovane_skupina='1'
FROM nakup t1
JOIN zakaznik t2 ON t1.zakaznik_id=t2.id
WHERE t2.skupina_id = '1'
Nevim jak na MySQL, ale pro MS SQL by to vypadalo takto
UPDATE t1 SET t1.spracovane_skupina='1'
FROM nakup t1
JOIN zakaznik t2 ON t1.zakaznik_id=t2.id
WHERE t2.skupina_id = '1'