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update t_tbl_desc a set num=(select count(name) from t_col_desc b where a.name=b.name)
update
t_tbl_desc
set
num=b.num
from
t_tbl_desc a,
(select distinct(name) as name,count(name) num from t_col_desc group by name)b
where
a.name=b.name
update
t_tbl_desc
set
num=b.num
from
t_tbl_desc a,
(select distinct(name),count(name) num from t_col_desc group by name)b
where
a.name=b.name