c*t
2 楼
I am trying to implement foreign key query myself. That is, given
table S, and a set of columns (s1, .. sn) in S, check if all set of
values are in the table T and unique key columns (t1, ... t).
What's the most efficient query?
thx
table S, and a set of columns (s1, .. sn) in S, check if all set of
values are in the table T and unique key columns (t1, ... t).
What's the most efficient query?
thx
n*6
4 楼
Cannot fully understand your question.
How about using the join?
How about using the join?
P*5
5 楼
where where
i*e
11 楼
阿姨回来了, 我轻松多了, 可以灌开水了。
j*n
12 楼
left join
y*2
16 楼
zan
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