update的格式是:
update table1
set table1.name=’abc’
from table1
inner join table2
on table1.id = table2.id
where table2.number = '123'
delete 的格式是:
delete from table1
from table1
inner join table2
on table1.id = table2.id
注意蓝色部分，这样就可以省掉复杂的中间表了^_^
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