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
相关阅读
Re: HELP!! How to run SQL Server 7 in my local computer(Windows2000)?Re: How to change Default Buffer Size for Long Columns?(string size exceeds 1K)How to create a new database under SQL 7.0 from remote host?what happened with the newsgroup in microft today哪里可以下载SQL SERVER7.0?How to transfer values between forms in Access?How to populate data from text or MS ACCESS file to Oracle Database?How to configure Listener in Oracle?Problems on ACCESS + VB谁能给OLAP具体下个定义?Use Access Link table to use SQL server tables.[转载] Where can i get this?Database Comparsion Chart这句SQL怎么写?Access database sizeDSN-less connection to SQL serverMS SQL Server 2k questionHow to delete Oracle SID?data mining tools? helphow to get the result in the middle of resultset?