What kind of join operation is described by the following?

If no match is made between the tuples in the relation, the new relation does not include the unmatched tuple. and the column on which the join was made occurs only once in the new relation.

With the following table, what will be produced by the relational algebra, σ Salary > 3000 ˅ City = ‘Batu Pahat’ (WORKER)?

Which of the following relational algebra operations can be used when you want to keep all the tuples of the first relation irrespective of whether or not they have matching tuples in the second relation?

What relational algebra operation is described by the following?

What integrity constraint is described by the following?

In a base relation, no attribute of a primary key can be null.

What will be the result of the set difference operation on relations X and Y (X - Y)?

The following tables (relational schema) form part of a database held in a relational DBMS:

where underlined attributes are primary keys in the tables. 

Which is NOT one of the foreign keys?

Which service model of cloud computing is described by the following?

This service model allows creation of web applications without buying/maintaining the software and underlying infrastructure. Provider manages the  infrastructure including network, servers, OS and storage, while  customer controls deployment of applications and possibly configuration. 

What is described by the following diagram?

What is described by the following diagram?