1-Explain the following terms and give examples

I. Weak Entity

II. Unary 

III. Binary 

IV. Teruary 

V. Domain 

VI. Entiry set or type

VII. Entity 

2- Differentiate between natural join, Uion Join and Outer Join.

3-What are subqueries? What are the types of subqueries? 

4- Explain Query Optimization 

5-List and explain the techniques of optimizing queries 

6- Explain the steps in query flow .

7-What is database connectivity?