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Question 1

Exercise 1. Write the SQL code that will create the table structure for a table named EMP 1. This table is a subset of the EMPLOYEE table. The basic EMP 1 table structure is summarized in Fig. 1. (Note that the JOB CODE is the FK to JOB.)

ATTRIBUTE               (FIELD)

NAME

DATA DECLARATION

EMP_NUM

CHAR(3)

EMP LNAME

VARCHAR(15)

EMP FNAME

VARCHAR(15)

EMI' INITIAL

CHARM

EMP HIREDATE

DATE

JOB CODE

CHAR(3)

Exercise 2. Having created the table structure in previous exercise, write the SQL code to enter the following rows for the table shown below:

  EMP_NUM EMP_LNAME EMP_FNAME EMP_INITIAL EW/P_HiREDATE  JOB_CODE
 » 101 News John G 8-Nov-98 502
  102 Senior David H 12-Jul-87 501
  103 Arbough June E 1-Dec-94 500
  104 Ramoras Anne K 15-Noy-85 501
  105 Johnson Alice K 1-Feb-91 502
  106 Smithfield Willtain   22-Jun-02 500
  107 Alonzo Maria D 10-Oct-91 500
  108 Washington Ralph B 22-Aug-89 501
  109 Smith Larry W 18-Jul-95 501

Exercise 3. Assuming that the data shown in the EMP 1 table have been entered, write the SQL code that will list all attributes for a job code of 502.

Exercise 4. Write the SQL code to change the job code to 501 for the person whose personnel number is 106. After you have completed the task, examine the results, and then reset the job code to its original value.

Exercise 5. Write the SQL code to delete the row for the person named William Smithfield, who was hired on June 22, 2002 and whose job code classification is 500.

Exercise 6. Write the SQL code to create a copy of EMP 1, naming the copy EMP 2. Then write the SQL code that will add the attributes EMP PCT and PROJ NUM to its structure. The EMP PCT is the bonus percentage to be paid to each employee. The new attribute characteristics are shown next:

EMP_PCT NUMBER(4,2)

PROJ_NUM CHAR(3)

Exercise 7.Write the SQL code to enter an EMP PCT value of 3.85 for the person whose employee number (EMP NUM) is 103. Next, enter the remaining EMP PCT values shown in Fig. 1.3:


EMP_NUM EMP_LNAME EMP_FNAME EMP_INITIAL EW/P_HiREDATE  JOB_CODE EMP_PCI PROJ_NUM
 » 101 News John G 8-Nov-98 502 5

102 Senior David H 12-Jul-87 501 8

103 Arbough June E 1-Dec-94 500 3.65

104 Ramoras Anne K 15-Noy-85 501 10

105 Johnson Alice K 1-Feb-91 502 5

106 Smithfield William
22-Jun-02 500 6.2

107 Alonzo Maria D 10-Oct-91 500 5.15

108 Washington Ralph B 22-Aug-89 501 10

109 Smith Larry W 18-Jul-95 501 2

Exercise 8. Using a single command sequence, write the SQL code that will enter the project number (PROJ NUM) = 18 for all employees whose job classification (JOB CODE) is 500.

Exercise 9. Using a single command sequence, write the SQL code that will enter the project number (PROJ NUM) = 25 for all employees whose job classification (JOB CODE) is 502 or higher.

Exercise 10. Write the SQL code that will enter a PROJ NUM of 14 for those employees who were hired before January 1, 1992 and whose job code is at least 501

Question 2

Exercise 11. You are given the EMPLOYEE, JOB, PROJECT and ASSIGNMENT tables in a database as in Fig. 1.4.

1473_find the average project value.png

The table schemes are:

EMPLOYEE (EMP NUM, EMP LNAME, EMP FNAME, EMP INITIAL, EMP HIREDATE, JOB CODE, EMP YEARS)

JOB (JOB CODE, JOB DESCRIPTION, JOB CHG HOUR, JOB LAST UPDATE)

PROJECT (PROJ NUM, PROJ NAME, PROJ VALUE, PROJ BALANCE, EMP NUM)

ASSIGNMENT (ASSIGN NUM, ASSIGN DATE, PROJ NUM, EMP NUM,

ASSIGN JOB, ASSIGN CHG HR, ASSIGN HOURS, ASSIGN CHARGE)

Using the EMPLOYEE, JOB, and PROJECT tables in the database (see above), write the SQL code that will produce the results shown in Fig. 1.5.

PRO_NAME PROJ_VALUE PRO_EALANCE EMP_LNAME EMP_FNAME EMP_INITIAL  JOB_CODE EMP_PCI JOB_CHG_HOUR
Rolling Tide 805000 500345.2 Senior David H 501 Systems Analyst 96.75
Evergreen 1453500 1002350 Arbougn June E 500 Programme' 35.8
Starfight 2650500 230988 Alcnzo Maria D 500 Programme' 35.75
AmbeWave 3500500 2110346 Washington Ralph B 501 ;Systems Analyst 96.8

Exercise 12. Write the SQL code that will produce a virtual table named REP 1. The virtual table should contain the same information that was shown in the previous exercise.

Exercise 13.Write the SQL code to find the average project value in the table PROJECT.

Exercise 14.Write the SQL code that will produce a listing for the data in the PROJECT table in ascending order by the project value.

Exercise 15. Write the SQL code that will list only the di?erent assignment jobs found in the ASSIGNMENT table.

Exercise 16.Write the SQL code to calculate the ASSIGN CHARGE values in the ASSIGNMENT table. Note that ASSIGN CHARGE is a derived attribute that is calculated by multiplying the ASSIGN CHG HR and the ASSIGN HOURS.

Exercise 17. Using the data in the ASSIGNMENT table, write the SQL code that will, for each employee, yield the total number of hours worked and the total charges stemming from those hours worked. The results of running that query are shown in Fig. 1.6.

EMP_NUM EMP_LNAME SUMOfASSIGN_HOURS SUMOfASSIGN_CHARGE
101 News 3.1 387.5
103 Arbough 19.7 1664.65
104 Ramoras 11.9 1218.7
105 Johnson 12.5. 1382.5
108 Washington 8.3 84015
113 Joenbrood 3.8 192.85
115 Bawangi 12.5 1276.75
117 Williamson 18.8 649.54

Exercise 18.Write a query to produce the total number of hours and charges for each of the projects represented in the ASSIGNMENT table. The output is shown in Fig. 1.7.

PROJ_NUM SumOFASSIGN_HOURS SumOFASSIGN_CHARGE
15 20.5 1806.52
18 23.7 1544.6
22 27 2593.16
25 19.4 1668.16

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