INFO 2312 – Midterm 2 Exam

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INFO 2312 – Midterm 2 Date: Jul 29th, 2021 Time: 2 Hours 45 Minutes

Due: 06.45 PM

Marks: 30 Marks

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The exam is open book and slides.

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No copying code from the internet is allowed.

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Separate spaces provided for query and screenshots of the answer.

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Not all questions need screenshots. Only answer what is asked in the question.

If you do not find the box to paste the screenshot, then it is not needed.

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For any clarification during the midterm, call, or text @ +1-236-795-9045.

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Consider the tables below. The csv files are attached with the exam in Moodle. The blank spaces are null values.

Employee

empno 7369 7499 7521 7566 7654 7698 7782 7788 7839 7844 7876 7900 7902 7934

ename SMITH ALLEN WARD JONES MARTIN BLAKE CLARK SCOTT KING TURNER ADAMS JAMES FORD MILLER

job CLERK SALESMAN SALESMAN MANAGER SALESMAN MANAGER MANAGER ANALYST PRESIDENT SALESMAN CLERK CLERK ANALYST CLERK

mgr 7902 7698 7698 7839 7698 7839 7839 7566 7698 7788 7698 7566 7782

hiredate 17-12-1980 20-02-1981 22-02-1981 02-04-1981 28-09-1981 01-05-1981 09-06-1981 09-12-1982 17-11-1981 08-09-1981 12-01-1983 03-12-1981 03-12-1981 23-01-1982

sal 800 1600 1250 2975 1250 2850 2450 3000 5000 1500 1100 950 3000 1300

comm 300 500 1400

0

deptno 20 30 30 20 30 30 10 20 10 30 20 30 20 10

Department deptno 10 20 30 40

dname ACCOUNTING RESEARCH SALES OPERATIONS

loc NEW YORK DALLAS CHICAGO BOSTON

1.

Create a new login group role ‘student’ with password ‘12345’, provide login access, database creation access and replication access. Then create a Database ‘midterm2’ and make ‘student’ as the owner of the database. The query can be generated by the GUI as shown in class to create group roles and databases. Past both queries below. [5 Marks] CREATE ROLE student WITH LOGIN NOSUPERUSER CREATEDB NOCREATEROLE INHERIT REPLICATION CONNECTION LIMIT -1 PASSWORD 'xxxxxx'; CREATE DATABASE midterm2 WITH OWNER = student ENCODING = 'UTF8' CONNECTION LIMIT = -1;

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2. Paste SQL query to CREATE TABLE ‘employee’ and ‘department’. Make sure to include foreign key. No Screenshot need only queries for the CREATE Table.

Paste Query to Create Table ‘employee’ [3 Marks] CREATE TABLE employee ( empno INT PRIMARY KEY, ename VARCHAR (100), job TEXT, mgr INT, hiredate DATE, sal NUMERIC, comm INT, deptno INT ); Paste Query to Create Table ‘department’ [2 Marks] CREATE TABLE department ( deptno INT PRIMARY KEY, dname VARCHAR (100), loc VARCHAR(100) );

3. Write SQL Query to copy the result of selecting all columns in the Left join between employee and department into another table name ‘employeedetails’.

Write the Query below. [4 Marks] SELECT employee.empno, employee.ename, employee.job, employee.mgr, employee.hiredate, employee.sal, employee.comm, employee.deptno, department.deptno, department.dname, department.loc FROM employee LEFT JOIN department ON employee.empno = department.deptno

Paste the Screenshot of Running a SELECT * FROM employeedetails (which was created above). [1 Marks]

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4. Write SQL query to list the employees who are either ‘CLERK’ or ‘ANALYST’ in the Desc order.

Write the Query below. [1 Marks] SELECT employee.empno, employee.ename, employee.job, employee.mgr, employee.hiredate, employee.sal, employee.comm, employee.deptno, department.deptno, department.dname, department.loc FROM employee LEFT JOIN department ON employee.empno = department.deptno ORDER BY employee.job DESC;

Paste the Screenshot of the output here. [1 Marks]

5. Write a Query to add another column updatedsalary with data type REAL to the employee table.

After that write, another Update query to fill the updatedsalary column with value being sal*1.05 (which shows an increment of 5% in salary) + the comm earned. There are few comm values that are NULL. NULL values cannot be added to another data type (doing that will give you error). So, you must make use of a function COALESCE([NULL], [VALUE]). If the first input parameter to this function is a NULL value, then whatever value is provided in the second input parameter, that value will replace the NULL values. This way all values can be replaced by 0 instead of NULL values along with the UPDATE query.

Query to ADD Column Below [2 Marks]

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ALTER TABLE employee ADD COLUMN updatedsalary boolean NOT NULL DEFAULT True;

Query to Update the Column Values [5 Marks]

Paste the Resulting screenshot of SELECT * FROM employee below. [1 Marks]

6. Write a function query to take the input as the employee no and the output will return a table showing the employee’s Name, department name and department location. Name the function as empDetails. Joins may be needed as columns to be outputted are present in both employee & department tables.

Write the Function Query Below. Be careful to write all the syntax properly. [4 Marks]

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Paste the Screenshot of Running a SELECT * FROM empDetails(7521). (which was created above). Here 7521 is just one input parameter. It can be any input parameter from the emp no. [1 Marks]

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