update Tabel_A
set Tabel_A_key = c.Tabel_C_min
from Tabel_A a , Tabel_b b , Tabel_C c
where a.Tabel_A_size = '6' and c.Tabel_C_min <> ''
and a.Tabel_A_a = c.Tabel_C_a
and b.Tabel_b_b = c.Tabel_C_b
上面这个sqlserver，转化成oracle的是什么....