0
3.5kviews
Explain the concept of a semi-join using an example
1 Answer
written 7.7 years ago by |
The semi-Join of two relations R and S is denoted as R SJ_FS, where F is a formula which specifies a join predicate. A semi-join is derived from projection and join as follows:
where Attr(R) denotes the set of all attributes of R. Thus, the result of the semi-join is …