The SQL statements comprising the DDL for the COMPANY Database are given to you.

Question

The SQL statements comprising the DDL for the COMPANY Database are given to you. For that database, answer the following queries. Create the files Q1 to Q10 in PostgreSQL. Do follow the restrictions stated for individual queries. When a query asks for "name" of employees, retrieve both, the first and the last names.

9. [9A] Create a View ProjectInfo that has the project name, controlling department name, number of employees, and total hours worked per week on the project for each project with more than one employee working on it. [9B] Show the contents of this view.

Explanation / Answer

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9A)

CREATE VIEW Project_Info AS

SELECT Pname, Dname, COUNT(W.Essn), SUM(W.Hours)

FROM PROJECT P, DEPARTMENT D, WORKS_ON W

WHERE P.Dnum=D.Dnumber AND P.Pnumber=W.Pno

GROUP BY Pno;

9B)

SELECT * FROM ProjectInfo;

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