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update Kpi_4_Data a set release_id = (select release_id from Feature b and b.feature_id=a.feature_id)
update a
set release_id = b.release_id
from Kpi_4_Data as a join Feature as b
on a.feature_id=b.feature_id
update Kpi_4_Data
set release_id=值
from Feature,
Kpi_4_Data
where 2表的对应关系