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Is there any difference between Database and Database Management System? Explain. Explain Network Model and Hierarchical Model with diagram. Design a ER Diagram for Hospital Management System. Write short notes on (Any TWO) Primary Key Mapping Constraints Instances and Schema Write down SQL statements for following (Any THREE) Display all employee whose name is starting from letter ‘R’ and ending with letter ‘H’. Display all employees no, name, annual salary of department 20. Display all employees whose salary is greater than their commission. Display all employees working under department no 10,20,30. 6. Who is Database Administrator (DBA)? Explain their task and dutie

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Exam : Oracle 1Z0-007 Title : Introduction to Oracle9i: SQL questions and practice sure pass 1. In which three cases would you use the USING clause? (Choose three.) A.You want to create a nonequijoin. B.The tables to be joined have multiple NULL columns. C.The tables to be joined have columns of the same name and different data types. D.The tables to be joined have columns with the same name and compatible data types. E.You want to use a NATURAL join, but you want to restrict the number of columns in the join condition. Answer: CDE 2. What are two reasons to create synonyms? (Choose two.) A.You have too many tables. B.Your tables are too long. C.Your tables have difficult names. D.You want to work on your own tables. E.You want to use another schema's tables. F.You have too many columns in your tables. Answer: CE 3. The STUDENT_GRADES table has these columns: STUDENT_ID NUMBER(12) SEMESTER_END DATE GPA NUMBER(4,3) The registrar requested a report listing the students' grade poi

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