Posts
PROJECTION and SELECTION.
Are the resulting relations of PRODUCT and JOIN operation the same?
No.
PRODUCT: Concatenation of every row in one relation with every row in another.
JOIN: Concatenation of rows from one relation and related rows from another.
--
Oracle RDBMS
1 comment:
I am reading this article second time today, you have to be more careful with content leakers. If I will fount it again I will send you a link
Post a Comment