Q.The operation which is not considered a basic operation of relational algebra is
(A) Join. (B) Selection.
(C) Union. (D) Cross product.
An SQL join clause combines columns from one or more tables in a relational database. It creates a set that can be saved as a table or used as it is. AJOIN is a means for combining columns from one (self-table) or more tables by using values common to each.
Q1. ER modelling technique is
d. right left approach
Answer : b.top down
A graphical technique for understanding and organizing the data independent of the actual database implementation
Q2. The descriptive property possessed by each entity set is _________ .
Answer: b) Attribute