material number: 50117373 col: 98 - saphelp

For Any SAP / IBM / Oracle - Materials Purchase Visit : www.sapcertified.com OR Contact Via Email Directly At : [email protected]

Material Number: 50117373

Col: 98


Internal Schema: How and where stored?Describes (DBMS specific) the internal, physical representation of data:How and where exactly the data is stored, internal record format, access paths, etc.

Conceptual Schema: What is stored?Overall presentation of the data model at the logical, (if possible) DBMS andapplication independent levelFor example, in relational representation, or even higher level of abstraction(e.g. E/R model)

External Schema: How is data presented to the user?(Partial) views of the database as required by applications or users(e.g. HR requires different views / details other than top management or theindividual employee)In the case of a relational database system implemented via views



Part 1: Exercise 01 - 1901)Create a list of employees. All columns are relevant.

02)Which employees have fewer than 30 remaining vacation days?

03)Which employees have fewer than 30 remaining vacation days?Sort the output descending by RemainderDays and - for employees with the same number ofRemainderDays - ascending by DNumber.

04)For which employees are the remaining vacation days unknown?

05)For which employees are the remaining vacation days known?

06)Create a list of employees. Only columns DNumber and Name are relevant.

07)Create a list of employees. Only columns DNumber and Name are relevant.The output column DNumber should be renamed to "PERSNUMBER".

08)Create a list of employees. Only columns DNumber and Name are relevant.The output column DNumber should be renamed to "Personal Number" (with small letters).

09)How many remaining vacation days has “Ms D”?

10)Which employees have exactly 10 remaining vacation days?

11)The value of a vacation day is estimated at EUR 300.- (all-in).The output of the employee data should be extended by the calculated value of the remainingvacation days.

12)The value of a vacation day is estimated at EUR 300.- (all-in).Which employees have remaining vacation days with a value of at least EUR 600.-?

13)Which numbers of remaining vacation days can be found in the company?Each quantity number should be displayed only once.

14)Which employees work for department "A04" and have exactly 20 remaining vacation days?

15)Which employees work in department "A01" or "A04"? Use OR

16)Which employees work in department "A01" or "A04"? Use IN

17)Which employees not working for department "A01" have exactly 10 remaining vacation days?

18)Which employee names include an "L"?

19)Which employees have a name beginning with "F" and in the third place an "a"?

Part 2: Exercise 20 - 2920)What is the number of employees?

21)How many employees have exactly 20 remaining vacation days?

22)In how many different departments do the employees work?

23)What is the maximum number of remaining vacation days?

24)What is the average number of remaining vacation days?Employees whose remaining vacation days are unknown should not be taken into account.

25)How many remaining vacation days have the employees accumulated in total?

26)The minimum, average, maximum, and total number of remaining vacation days should bedisplayed with a single query.

27)What is the deviation of maximum remaining vacation days to the average of remainingvacation days?

28)The total number of remaining vacation days should be displayed for each department.

29)The total number of remaining vacation days should be displayed for each department.Only departments with more than 30 days should be taken into account.The display of the total number of days should be sorted descending.

Part 3: Exercise 30 - 4030)Which employees work for department "A01" or A04"? Use UNION.

31)Which employees work for which department? Use an implicit JOIN without tuple variables.Employees without department and departments without employees should not be taken intoaccount.

32)Which employees work for which department? Use an implicit JOIN with tuple variables.Employees without department and departments without employees should not be taken intoaccount.

33)Which employees work for which department? Use an explicit JOIN without tuple variables.Employees without department and departments without employees should not be taken intoaccount.

34)Which employees work for which department? Use an explicit JOIN with tuple variables.Employees without department and departments without employees should not be taken intoaccount.

35)Which employees work for which department?Employees without department should be included, whereas departments without employeesshould be ignored.Use a LEFT OUTER JOIN with tuple variables.

36)Which employees work for which department?Employees without department should be ignored, whereas departments without employeesshould be included.Use a RIGHT OUTER JOIN with tuple variables.

37)Which employees work for which department?Employees without department and departments without employees should be included.Use a FULL OUTER JOIN with tuple variables.

38)Which employees work for the Sales department? Use an implicit Join with tuple variables.

39)Which employees work for the Sales department? Use an explicit Join with tuple variables.



40)Which department has accumulated how many remaining vacation days?Only colleagues born after 03.02.1972 should be taken into account.The output of the number of days should be sorted descending.Only departments that accumulated more than 30 remaining vacation days should be included.



Part 4: Exercise 41 - 4541)Which employees work for the Sales department?Use an uncorrelated sub query.

42)Which employees work for the Sales department?Use a correlated sub query.

43)Which employees accumulated the most remaining vacation days?Use an uncorrelated sub query with "MAX".

44)Which employees accumulated the most remaining vacation days?Use an uncorrelated sub query without "MAX".

45)Which employees have above average remaining vacation days?

Part 5: Exercise 46 - 5346)Copy the data from table "EMPLOYEE" into the (structural equal) table "STAFF".

47)Set the remaining vacation days of "Mr A" of table "STAFF" to 50 days.

48)Reduce the remaining vacation days to 18 for all employees (table "STAFF"), who have morethan 18 days.

49)Triple the remaining vacation days of employees (table "STAFF") working for department"Development" or "Test".Use an uncorrelated sub query with "IN".

50)Create a new entry in table "STAFF".

51)"Mr A" is leaving the company. Delete his data from table "STAFF".

52)Delete employees from table "STAFF", where the department information is unknown.

53)The departments "Planning" and "Test" are closed.Delete all employees of those departments from table "STAFF".Use an uncorrelated sub query with "IN".

Part 6: Exercise 54 - 6054)Create a new column table "Locations" with columns

"Token" – type VARCHAR, length 3"Region" – type VARCHAR, length 20"Country" – type VARCHAR, length 20"City" – type VARCHAR, length 20

Each location is uniquely identified by "Token".When inserting data, "Country" and "Region" can be unknown, but not the "City".If no "Region" is specified during insert the default value "EMEA" should be used.

55)Extend the newly created table "Locations" with columns

"Population" – type INTEGER"Mayor" – type VARCHAR, length 30

56)Remove the columns "Country" and "Population" from table "Locations".

57)Change the table definition of "Locations" that column "City" can have NULL values.

58)Delete table "Locations".

59)Create view "ManagerView".The manager of department "A04" should only view data of his own employees.To avoid discrimination/favoritism the birthday should be excluded.Rename column "RemainderDays" to "VacationDays".

60)Delete view "ManagerView".

43



Example illustrates that „transaction level isolation“ is not exactly the same as isolation-level „repeatableread“ in single-version concurrency control:In classical DBMSs, T2 and T4 would see V2 if they read it first after T3 is committed.

Part 1: Exercise 01 - 1901)Create a list of employees. All columns are relevant.

02)Which employees have fewer than 30 remaining vacation days?

03)Which employees have fewer than 30 remaining vacation days?Sort the output descending by RemainderDays and - for employees with the same number ofRemainderDays - ascending by DNumber.

04)For which employees are the remaining vacation days unknown?

05)For which employees are the remaining vacation days known?

06)Create a list of employees. Only columns DNumber and Name are relevant.

07)Create a list of employees. Only columns DNumber and Name are relevant.The output column DNumber should be renamed to "PERSNUMBER".

08)Create a list of employees. Only columns DNumber and Name are relevant.The output column DNumber should be renamed to "Personal Number" (with small letters).

09)How many remaining vacation days has “Ms D”?

10)Which employees have exactly 10 remaining vacation days?

11)The value of a vacation day is estimated at EUR 300.- (all-in).The output of the employee data should be extended by the calculated value of the remainingvacation days.

12)The value of a vacation day is estimated at EUR 300.- (all-in).Which employees have remaining vacation days with a value of at least EUR 600.-?

13)Which numbers of remaining vacation days can be found in the company?Each quantity number should be displayed only once.

14)Which employees work for department "A04" and have exactly 20 remaining vacation days?



15)Which employees work in department "A01" or "A04"? Use OR

16)Which employees work in department "A01" or "A04"? Use IN

17)Which employees not working for department "A01" have exactly 10 remaining vacation days?

18)Which employee names include an "L"?

19)Which employees have a name beginning with "F" and in the third place an "a"?

Part 1: Exercise 01 - 1901) Create a list of employees. All columns are relevant.

SELECT * FROM Employee;

02) Which employees have fewer than 30 remaining vacation days?

SELECT * FROM Employee WHERE RemainderDays < 30;

03) Which employees have fewer than 30 remaining vacation days?Sort the output descending by RemainderDays and - for employees with the same numberof RemainderDays - ascending by DNumber.

SELECT * FROM Employee WHERE RemainderDays < 30ORDER BY RemainderDays DESC, DNumber ASC;

04) For which employees are the remaining vacation days unknown?

SELECT * FROM Employee WHERE RemainderDays IS NULL;

05) For which employees are the remaining vacation days known?

SELECT * FROM Employee WHERE RemainderDays IS NOT NULL;

06) Create a list of employees. Only columns DNumber and Name are relevant.

SELECT DNumber, Name FROM Employee;

07) Create a list of employees. Only columns DNumber and Name are relevant.The output column DNumber should be renamed to "PERSNUMBER".

SELECT DNumber AS PersNumber, Name FROM Employee;



08) Create a list of employees. Only columns DNumber and Name are relevant.The output column DNumber should be renamed to "Personal Number" (with small letters).

SELECT DNumber AS "Personal Number", Name FROM Employee;

09) How many remaining vacation days has “Ms D”?

SELECT RemainderDays FROM Employee WHERE Name = 'Ms D';

10) Which employees have exactly 10 remaining vacation days?

SELECT * FROM Employee WHERE RemainderDays = 10;

11) The value of a vacation day is estimated at EUR 300.- (all-in). The output of the employee data should be extended by the calculated value of the

remaining vacation days.

SELECT *, RemainderDays * 300 AS RemainderDaysValue FROM Employee;

12) The value of a vacation day is estimated at EUR 300.- (all-in).Which employees have remaining vacation days with a value of at least EUR 600.-?

SELECT *, RemainderDays * 300 AS RemainderDayValue FROM Employee WHERE RemainderDays * 300 >= 600;

13) Which numbers of remaining vacation days can be found in the company?Each quantity number should be displayed only once.

SELECT DISTINCT RemainderDays FROM Employee WHERE RemainderDays IS NOT NULL;



14) Which employees work for department "A04" and have exactly 20 remaining vacation days?

SELECT * FROM Employee WHERE DepID = 'A04' AND RemainderDays = 20;

15) Which employees work in department "A01" or "A04"? Use OR

SELECT * FROM Employee WHERE DepID = 'A01' OR DepID = 'A04';

16) Which employees work in department "A01" or "A04"? Use IN

SELECT * FROM Employee WHERE DepID IN ('A01', 'A04');

17) Which employees not working for department "A01" have exactly 10 remaining vacationdays?

SELECT * FROM Employee WHERE DepID <> 'A01' AND RemainderDays = 10;

18) Which employee names include an "L"?

SELECT * FROM Employee WHERE Name LIKE '%L%';

19) Which employees have a name beginning with "F" and in the third place an "a"?

SELECT * FROM Employee WHERE Name LIKE 'F_a%';



Part 2: Exercise 20 - 2920)What is the number of employees?

21)How many employees have exactly 20 remaining vacation days?

22)In how many different departments do the employees work?

23)What is the maximum number of remaining vacation days?

24)What is the average number of remaining vacation days?Employees whose remaining vacation days are unknown should not be taken into account.

25)How many remaining vacation days have the employees accumulated in total?

26)The minimum, average, maximum, and total number of remaining vacation days should bedisplayed with a single query.

27)What is the deviation of maximum remaining vacation days to the average of remaining vacationdays?

28)The total number of remaining vacation days should be displayed for each department.

29)The total number of remaining vacation days should be displayed for each department.Only departments with more than 30 days should be taken into account.The display of the total number of days should be sorted descending.



Part 2: Exercise 20 - 2920) What is the number of employees?

SELECT COUNT(*) FROM Employee;

21) How many employees have exactly 20 remaining vacation days?

SELECT COUNT(*) FROM Employee WHERE RemainderDays = 20;

22) In how many different departments do the employees work?

SELECT COUNT(DISTINCT DepID) FROM Employee;

23) What is the maximum number of remaining vacation days?

SELECT MAX(RemainderDays) FROM Employee;

24) What is the average number of remaining vacation days?Employees whose remaining vacation days are unknown should not be taken into account.

SELECT AVG(RemainderDays) FROM Employee;

25) How many remaining vacation days have the employees accumulated in total?

SELECT SUM(RemainderDays) FROM Employee;

26) The minimum, average, maximum, and total number of remaining vacation days should bedisplayed with a single query.

SELECT MIN(RemainderDays) AS "min", AVG(RemainderDays) AS "avg", MAX(RemainderDays) AS "max", SUM(RemainderDays) AS "sum" FROM Employee;



27) What is the deviation of maximum remaining vacation days to the average of remainingvacation days?

SELECT MAX(RemainderDays) - AVG(RemainderDays) FROM Employee;

28) The total number of remaining vacation days should be displayed for each department.

SELECT DepID, SUM(RemainderDays) FROM EmployeeGROUP BY DepID;

29) The total number of remaining vacation days should be displayed for each department.Only departments with more than 30 days should be taken into account.The display of the total number of days should be sorted descending.

SELECT DepID, SUM(RemainderDays) FROM EmployeeGROUP BY DepID HAVING SUM(RemainderDays) > 30ORDER BY 2 DESC;



Part 3: Exercise 30 - 4030)Which employees work for department "A01" or A04"? Use UNION.

31)Which employees work for which department? Use an implicit JOIN without tuple variables.Employees without department and departments without employees should not be taken intoaccount.

32)Which employees work for which department? Use an implicit JOIN with tuple variables.Employees without department and departments without employees should not be taken intoaccount.

33)Which employees work for which department? Use an explicit JOIN without tuple variables.Employees without department and departments without employees should not be taken intoaccount.

34)Which employees work for which department? Use an explicit JOIN with tuple variables.Employees without department and departments without employees should not be taken intoaccount.

35)Which employees work for which department?Employees without department should be included, whereas departments without employeesshould be ignored.Use a LEFT OUTER JOIN with tuple variables.

36)Which employees work for which department?Employees without department should be ignored, whereas departments without employeesshould be included.Use a RIGHT OUTER JOIN with tuple variables.

37)Which employees work for which department?Employees without department and departments without employees should be included.Use a FULL OUTER JOIN with tuple variables.

38)Which employees work for the Sales department? Use an implicit Join with tuple variables.

39)Which employees work for the Sales department? Use an explicit Join with tuple variables.



40)Which department has accumulated how many remaining vacation days?Only colleagues born after 03.02.1972 should be taken into account.The output of the number of days should be sorted descending.Only departments that accumulated more than 30 remaining vacation days should be included.



Part 3: Exercise 30 - 4030) Which employees work for department "A01" or A04"? Use UNION.

SELECT * FROM Employee WHERE DepID = 'A01'UNION SELECT * FROM Employee WHERE DepID = 'A04';

31) Which employees work for which department?Use an implicit JOIN without tuple variables.Employees without department and departments without employees should not be taken intoaccount.

SELECT Employee.Name, Department.Name FROM Employee, Department WHERE Employee.DepID = Department.DepID;

32) Which employees work for which department? Use an implicit JOIN with tuple variables. Employees without department and departments without employees should not be taken into

account.

SELECT e.Name, d.Name FROM Employee e, Department d WHERE e.DepID = d.DepID;

33) Which employees work for which department? Use an explicit JOIN without tuple variables. Employees without department and departments without employees should not be taken into

account.

SELECT Employee.Name, Department.Name FROM Employee JOIN Department ON Employee.DepID = Department.DepID;

34) Which employees work for which department? Use an explicit JOIN with tuple variables. Employees without department and departments without employees should not be taken into

account.SELECT e.Name, d.Name FROM Employee e JOIN Department d

ON e.DepID = d.DepID;



35) Which employees work for which department?Employees without department should be included, whereas departments without employeesshould be ignored.Use a LEFT OUTER JOIN with tuple variables.

SELECT e.Name, d.Name FROM Employee e LEFT OUTER JOIN Department d ON e.DepID = d.DepID;

36) Which employees work for which department?Employees without department should be ignored, whereas departments without employeesshould be included.Use a RIGHT OUTER JOIN with tuple variables.

SELECT e.Name, d.Name FROM Employee e RIGHT OUTER JOIN Department d ON e.DepID = d.DepID;

37) Which employees work for which department?Employees without department and departments without employees should be included.Use a FULL OUTER JOIN with tuple variables.

SELECT e.Name, d.Name FROM Employee e FULL OUTER JOIN Department d ON e.DepID = d.DepID;

38) Which employees work for the Sales department?Use an implicit Join with tuple variables.

SELECT e.* FROM Employee e, Department d WHERE e.DepID = d.DepID AND d.Name = 'Sales';

39) Which employees work for the Sales department?Use an explicit Join with tuple variables.

SELECT e.* FROM Employee e JOIN Department d ON e.DepID = d.DepID WHERE d.Name = 'Sales';



40) Which department has accumulated how many remaining vacation days?Only colleagues born after 03.02.1972 should be taken into account.The output of the number of days should be sorted descending.Only departments that accumulated more than 30 remaining vacation days should beincluded.

SELECT d.Name, SUM(e.RemainderDays) AS DepartmentsVacation FROM Employee e JOIN Department d ON e.DepID = d.DepID WHERE e.DateOfBirth > '1972-02-03'GROUP BY d.Name, d.DepID HAVING SUM(e.RemainderDays) > 30ORDER BY DepartmentsVacation DESC;



Part 4: Exercise 41 - 4541)Which employees work for the Sales department?Use an uncorrelated sub query.

42)Which employees work for the Sales department?Use a correlated sub query.

43)Which employees accumulated the most remaining vacation days?Use an uncorrelated sub query with "MAX".

44)Which employees accumulated the most remaining vacation days?Use an uncorrelated sub query without "MAX".

45)Which employees have above average remaining vacation days?



Part 4: Exercise 41 - 4541) Which employees work for the Sales department?

Use an uncorrelated sub query.

SELECT * FROM Employee WHERE DepID = ANY (SELECT DepID FROM Department WHERE Name = 'Sales');

42) Which employees work for the Sales department?Use a correlated sub query.

SELECT e.* FROM Employee e WHERE EXISTS (SELECT * FROM Department d WHERE d.DepID = e.DepID AND d.Name = 'Sales');

43) Which employees accumulated the most remaining vacation days?Use an uncorrelated sub query with "MAX".

SELECT * FROM Employee WHERE RemainderDays = (SELECT MAX(RemainderDays) FROM Employee);

44) Which employees accumulated the most remaining vacation days?Use an uncorrelated sub query without "MAX".

SELECT * FROM Employee WHERE RemainderDays >= ALL (SELECT RemainderDays FROM Employee WHERE RemainderDays IS NOT NULL);

45) Which employees have above average remaining vacation days?

SELECT * FROM Employee WHERE RemainderDays > (SELECT AVG(RemainderDays) FROM Employee);



Part 5: Exercise 46 - 5346)Copy the data from table "EMPLOYEE" into the (structural equal) table "STAFF".

47)Set the remaining vacation days of "Mr A" of table "STAFF" to 50 days.

48)Reduce the remaining vacation days to 18 for all employees (table "STAFF"), who have morethan 18 days.

49)Triple the remaining vacation days of employees (table "STAFF") working for department"Development" or "Test".Use an uncorrelated sub query with "IN".

50)Create a new entry in table "STAFF".

51)"Mr A" is leaving the company. Delete his data from table "STAFF".

52)Delete employees from table "STAFF", where the department information is unknown.

53)The departments "Planning" and "Test" are closed.Delete all employees of those departments from table "STAFF".Use an uncorrelated sub query with "IN".



Part 5: Exercise 46 - 5346) Copy the data from table "EMPLOYEE" into the (structural equal) table "STAFF".

INSERT INTO Staff SELECT * FROM Employee;

47) Set the remaining vacation days of "Mr A" of table "STAFF" to 50 days.

UPDATE Staff SET RemainderDays = 50 WHERE Name = 'Mr A';

48) Reduce the remaining vacation days to 18 for all employees (table "STAFF"), who havemore than 18 days.

UPDATE Staff SET RemainderDays = 18 WHERE RemainderDays > 18;

49) Triple the remaining vacation days of employees (table "STAFF") working for department"Development" or "Test".Use an uncorrelated sub query with "IN".

UPDATE Staff SET RemainderDays = 3 * RemainderDays WHERE DepID IN (SELECT DepID FROM Department WHERE Name = 'Development'

OR Name = 'Test');

50) Create a new entry in table "STAFF".

INSERT INTO Staff VALUES ('D200000', 'Mr X', '1977-07-07', 10, 'A01');

51) "Mr A" is leaving the company. Delete his data from table "STAFF".

DELETE FROM Staff WHERE Name = 'Mr A';

52) Delete employees from table "STAFF", where the department information is unknown.

DELETE FROM Staff WHERE DepID IS NULL;



53) The departments "Planning" and "Test" are closed.Delete all employees of those departments from table "STAFF".Use an uncorrelated sub query with "IN".

DELETE FROM Staff WHERE DepID IN (SELECT DepID FROM Department WHERE Name = 'Planning' OR Name = 'Test');



Part 6: Exercise 54 - 60

54)Create a new column table "Locations" with columns

"Token" – type VARCHAR, length 3"Region" – type VARCHAR, length 20"Country" – type VARCHAR, length 20"City" – type VARCHAR, length 20

Each location is uniquely identified by "Token".When inserting data, "Country" and "Region" can be unknown, but not the "City".If no "Region" is specified during insert the default value "EMEA" should be used.

55)Extend the newly created table "Locations" with columns

"Population" – type INTEGER"Mayor" – type VARCHAR, length 30

56)Remove the columns "Country" and "Population" from table "Locations".

57)Change the table definition of "Locations" that column "City" can have NULL values.

58)Delete table "Locations".

59)Create view "ManagerView".The manager of department "A04" should only view data of his own employees.To avoid discrimination/favoritism the birthday should be excluded.Rename column "RemainderDays" to "VacationDays".

60)Delete view "ManagerView".



Part 6: Exercise 54 - 6054) Create a new column table "Locations" with columns "Token", "Region", "Country" and

"City".Each location is uniquely identified by "Token".When inserting data, "Country" and "Region" can be unknown, but not the "City".If no "Region" is specified during insert the default value "EMEA" should be used.

CREATE COLUMN TABLE Locations (Token VARCHAR(3) PRIMARY KEY, Region VARCHAR(20) DEFAULT 'EMEA', Country VARCHAR(20), City VARCHAR(20) NOT NULL);

55) Extend the newly created table "Locations" with columns "Population" and "Mayor".

ALTER TABLE Locations ADD (Population INTEGER, Mayor VARCHAR(30));

56) Remove the columns "Country" and "Population" from table "Locations".

ALTER TABLE Locations DROP (Country, Population);

57) Change the table definition of "Locations" that column "City" can have NULL values.

ALTER TABLE Locations ALTER (City VARCHAR(20) NULL);

58) Delete table "Locations".

DROP TABLE Locations;

59) Create view "ManagerView".The manager of department "A04" should only view data of his own employees.To avoid discrimination/favoritism the birthday should be excluded.Rename column "RemainderDays" to "VacationDays".

CREATE VIEW ManagerView AS SELECT DNumber, Name, RemainderDays AS VacationDays FROM Employee WHERE DepID = 'A04';

60) Delete view "ManagerView".

DROP VIEW ManagerView;

End



material number: 50117373 col: 98 - saphelp

Documents