ES II Set 1 Date: 20 th July 2018 Class XII Sec. Time: 1 1/2 Hrs. Informatics Practices answer key M.M.: 35

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1 ES II Set 1 Date: 20 th July 2018 Class XII Sec. Time: 1 1/2 Hrs. Informatics Practices answer key M.M.: 35 Name Roll No. Instruction: a) Attempt all questions neatly. b) All Parts of the same question to be attempted together. 1. (a) A table book has 10 rows and 16 columns. Another table author has 10 rows and 20 columns.what will be the degree and cardinality of the cartesian product of the 2 tables. 1 cardinality 100 degree - 36 (b) Is NULL and 0(zero) same?jusify your answer. 1 No, it s not the same as null means a value that is unavailable, unassigned or unknown and zero is a defined value. (c) Explain COMMIT, SAVEPOINT with example 2 COMMITthis statement is used to end a transaction and make all changes permanent. Until a transaction is committed, other users cannot see the changes made to the database. SAVEPOINT- It is point in a transaction, up till which all changes have been saved permanently. d) What is Foreign Key? Create a foreign key and explain 2 Foreign Key: It is a column of a table which is the primary key of another table in the same database. It is used to enforce referential integrity of the data. Create table dept ( Deptnumb int(2) PRIMARY KEY, Deptname varchar(10) ); Create table emp ( Empno int(5) PRIMARY KEY, Empname varchar(30), Deptno int(2), Sal decimal(7,2), foreign key deptno references dept(deptnumb) ); XII / IP Page 1 of 5

2 2 a) Give the output of the following program 1 i) System.out.println( XII A ); System.out.print( XIIB ); System.out.println( XIIC ); XIIA XIIBXIIC_ b) Identify the error. 1 int a; switch(code) case 10.5: a=10.5; case 20.5: a=20.5; int a; switch(code) case 10.5: a=10.5; case 20.5: a=20.5; cannot accept float values. c) Differentiate between list and combo box swing control 2 List:A list is used to get one or more options out of several given options which may or may not be mutually exclusive. This may seem to be the case wherecheckboxes are to be used, but the difference is in the number of options available. If the number of options is small, then CheckBoxes can be used. In case of large number of options, using CheckBoxes may take up a lot of spaceon the form and it may also be inconvenient for t he user to select the desiredoptions. In such cases Lists are preferred over checkboxes. Examples of such cases are: To select cities out of a given list of cities, to select magazines out of a given list of magazines, etc. ComboBox: A ComboBox is used to get an option out of several given options which are mutually exclusive. This may seem to be the case where RadioButtons are to beused, but the difference is in the number of options available. If the number ofoptions is small, then RadioButtons can be used. In case of large number ofoptions, using RadioButton s may take up a lot of space on the form and it may also be inconvenient for the user to select the desired option. In such casescomboboxes are preferred over radio buttons. Examples of such cases are: To select a city out of a given list of cities, to select a train out of a given list of trains, etc. d) Convert into switch case 2 XII / IP Page 2 of 5

3 if code== A grade= A ; else if code == B grade = B else grade= C ; char grade; switch(grade) case A: grade= A ; break; case B : grade= B ; break; default: grade= C ; e) Give the command to 2 a. Exit an application System.exit(0); b. To clear the textfield t1 t1.settext( ); 3. Consider the tables SURGEON and PATIENT given below: SURGEON sur_id Name Department OPD_Days 101 Smita ENT TTS 102 Chelsea Pediatric MWF 201 Sakshi Ortho MWF PATIENTS PATIENT Pat_No Pat_Name Department sur_id 1 Neeraj ENT Mohit Ortho Rahul ENT Vivek Ortho 201 With reference of these tables, write commands in SQL for (i) and (ii) and ANSWER THE (iii): (i) Display the Patno, PatName and corresponding surgeon Name for each patient. 2 Select patno,patname, name from sur_id,patients where surgeon.sur_id=patient. sur_id; (ii) Display the name of all patients whose OPD days are TTS. 2 Select patname from surgeon,patient where surgeon.sur_id=patient. sur_id and opd_days = TTS ; XII / IP Page 3 of 5

4 (iii) NAME THE primary key of surgeon and patient table. name the foreign key too. Can the user enter 104 as sur_id in patient table. If not why? 2 Primary key =sur_id and Pat_no foreign key = sur_id in patient table. no because it is violating the referential integrity rule. 4. a) Write SQL query to create a table Job with the following structure: 2 Table : Job fieldname datatype size Constraint J_Code Integer 6 Primary key J_Description varchar 25 Not null J_Chg_Hr integer 30 Default 20 J_Lastdt date Create table Job (J_Code Integer(6) Primary key, J_Description Varchar(25) Not Null, J_Chg_Hr Integer (30) default 20, J_Lastdate Date); b) Name the SQL single row function to do the following 2 (i) returns a number (ii) returns uppercase letters round(),truncate() or any other Upper() or Ucase() c) Consider the table Employee given below. Write the commands in SQL for 1 to 4 and output for 5 and 6. 6 EMPLOYEE ID Name Department age DOJ Gender Salary 1 Anushmi Marketing F Priyanshu Sales M Akash IT M Twinkle HR F shikha IT F To display all information about Employees of sales department who were hired on a Monday. Select * from Employee where category = TGT and dayname(hiredate)= Monday ; 2. To display the count of the Employee Department wise with age above 20. SELECT department, count(*) FROM Employee GROUP BY department having age > 20; 3. To display names, departments of all the Employees in lower case and in descending order of salary. Select lower(name), lower(department) from Employee order by salary desc; 4. To display the count of the unique departments. SELECT count(distinct(department)) FROM Employee; 5. SELECT DISTINCT(Department) FROM Employee; DISTINCT(department) Marketing XII / IP Page 4 of 5

5 Sales IT HR 6. SELECT sum(salary) FROM Employee WHERE NAME LIKE a%a ; sum(salary) a) Write the name of two commonly used e_commerce portal b) Mention the main advantages and disadvantages of e-governance sites 2 1. Positive impact a. It improves the efficiency of administration and service delivery. b. Reduced waiting time for the work completion. c. Reduced the cost of availing the service. d. Successful in keeping a tab on corruption to some extent. e. Increased public participation. 2. Negative Impact a. People living in rural or remote area could not benefited due to lack of computerization. b. Manual methods cannot be avoided. c. Lack of awareness amongst people. c) Mention the swing control to make a form which will perform the following tasks 2 Sl no Control used to Swing control 1 Take the time from the user Text Field 2 Give a picture Label 3 To select your train number Combo Box 4 To select the newspaper/ newspapers you like List XII / IP Page 5 of 5

6 ES II Set 1I Date: 20 th July 2018 Class XII Sec. Time: 1 1/2 Hrs. Informatics Practices Answer key M.M.: 35 Name Roll No. Instruction: a) Attempt all questions neatly. b) All Parts of the same question to be attempted together. 1. a) A table doctor has 20 rows and 10 columns. Another table patient has 10 rows and 20 columns.what will be the degree and cardinality of the cartesian product of the 2 tables. 1 cardinality 200 degree - 30 b) Give the command to add a new column Gender of char type width 1, in an already existing table CUSTOMERS. 1 ALTER TABLE CUSTOMERS ADD GENDER CHAR; c) Explain why the following queries give different outputs on execution although they are operating on the same table? 2 (i) SELECT COUNT(ENAME) FROM EMP; Output: 5 (ii) SELECT Count(*) FROM EMP; Output: 8 Ans -Aggregate functions ignore NULL values. The first query counts the Not Null values in the column ENAME hence the output is 5. But the second query counts all the records present in the table EMP which gives the output as 8. Hence this implies that there are 8 rows in the table and the Ename column contains the name of only 5 employees. 8-5 = 3, i.e. 3 names have been left blank. This means that there are 3 null values in the column ENAME. d) What is Foreign Key? Create a foreign key and explain 2 Foreign Key: It is a column of a table which is the primary key of another table in the same database. It is used to enforce referential integrity of the data. Create table dept ( Deptnumb int(2) PRIMARY KEY, Deptname varchar(10) ); XII / IP Page 1 of 6

7 Create table emp ( Empno int(5) PRIMARY KEY, Empname varchar(30), Deptno int(2), Sal decimal(7,2), foreign key deptno references dept(deptnumb) ); 2 a) Give the output of the following program 1 i) System.out.print( The ); System.out.println( Air ); System.out.print( Force ); System.out.println( School ); The Air Force School _ b) Identify the error. 1 int a; switch(code) case 10.5: a=10.5; case 20.5: a=20.5; int a; switch(code) case 10.5: a=10.5; case 20.5: a=20.5; cannot accept float values. c) Which property of the Radio Button should be selected so that only one radio button out of four should be selected at a time? 1 buttongroup d) Java is a case sensitive language Explain with an example. 1 Java is a case sensitive language as java distinguish between uppercase and lowercase very strictly. For example: int num1, Num1; Although both variable have same name in the above statement but java will treat them two different variables due to first character in different case. XII / IP Page 2 of 6

8 e) Rewrite the following code using if else if statement instead of switch : 2 switch (success) case -1: x1 = " result not declared" ; break; case 0: x1 = "Not successful"; break; default: x1 = "result NOT known"; break; if (success == -1) x1= result not declared ; else if (success == 0) x1= Not successful ; else x1= result NOT known ; f) Give the command to 2 (i) Make the label lbl1 uneditable lb1.seteditable(false); (ii) Disable the button btn1 btn1.setenabled(false); 3. Consider the tables EVENT and CELEBRITY given below: Table: Event EventId Event NumPerformers CelebID 101 Birthday 10 C Promotion Party 20 C Engagement 12 C Wedding 15 C104 Table: Celebrity CelebID Name Phone FeeCharged C101 Faiz Khan C102 Sanjay Kumar C103 Neera Khan Kapoor C104 Reena Bhatia With reference of these tables, write commands in SQL for (i) and (ii) and give the answer for (iii): (i) Increase the fee charged by each celebrity by 20% whose name starts with V. 2 Update Celebrityset FeeCharged = FeeCharged *1.20 WHERE name like V% ; XII / IP Page 3 of 6

9 (ii) To display EventId, Event name, Celebrity Id and Names of celebrities for only those events that have more than 10 performers. 2 SELECT EventId, Event, Event.CelebId, NAME FROM Event, Celebrity WHERE Event.CelebId = Celebrity.CelebId AND NumPerformers>10; (iii) Name the Primary keys in both the tables and Foreign key in the table. Can CelebID in the table event have a value of C105? Give reason. 2 Primary key = CelebID and EventId foreign key = CelebID in event table. no because it is violating the referential integrity rule. 4. a) Write SQL query to create a table WORKSHOP with the following structure: 2 Table : WORKSHOP Fieldname datatype size Constraint WorkshopId Integer 6 Primary key Title varchar 25 Not null DateWorkshop date Numspeakers Integer 3 Default 20 CREATE TABLE WORKSHOP ( WorkshopId INTEGER(6) PRIMARY KEY, Title VARCHAR(25) not null, DateWorkshop DATE, Numspeakers INTEGER (3) default 20); b) Name the SQL single row function to do the following 2 (i) returns a number (ii) returns uppercase letters round(),truncate() or any other Upper() or Ucase() c) Consider the table PRODUCT given below. Write the commands in SQL for 1 to 4 and output for 5 and 6. 6 PRODUCT PCode PNAME PurDate UnitPrice Discount 101 Frock Cot Soft Toy Baby Socks Baby Suit NOTE : Discount column stores discount %. 1. To display all information about those products where product name has cot in it and has been purchased on a Wednesday. XII / IP Page 4 of 6

10 Select * from Product where pname like %cot% and dayname(purdate)= Monday ; 2. To display the count of the products name wise with discount above 40. SELECT pname, count(*) FROM Product GROUP BY pname having discount > 40; 3. To display names of all the Products in lower case and in descending order of discount. Select lower(name) from Product order by discount desc; 4. To display the product name and price of all products if 8 units have to be bought. Give it the heading Price of 8 units SELECT name, unitprice*8 Price of 8 units FROM Product; 5. SELECT count(distinct(discount)) FROM product; count(distinct(discount)) 4 6. SELECT sum(unitprice) FROM product WHERE PNAME LIKE %B% ; sum(unitprice) a) Write the name of two commonly used governance portal b) Give the Societal Impacts of e-learning sites 2 Societal Impacts: 1. Positive impact a. Availability of same course to millions. b. Self paced. c. Can learn at any age. d. Increased retention and stronger grasp of subject. e. Boon for working class. f. Reduced learning times g. fast updation. h. Not time bound. It is available 24 X 7. i. Increased retention and stronger grasp of subject as visual impact is always more than audio impact. j. Unbound by space i.e. study at home k. Easily manageable. l. Travel time and associated cost (parking, fuel, vehicle maintenance)are reduced or eliminated hence cost effective m. Enhances computer and Internet skills. 2. Negative Impact a. Issues related to Technology. b. Inappropriate content. c. Reduced social and cultural interactions. c) Mention the swing control to make a form which will perform the following tasks 2 XII / IP Page 5 of 6

11 Sl no Control used to Swing control 1 Take the date from the user Text Field 2 Give a heading Label 3 To select your nationality Combo Box 4 To select the author/ authors you like List XII / IP Page 6 of 6

ES II set 1 Date: July 2017 Class XII Sec. Time: 1 1/2 Hrs. Informatics Practices answer key M.M.: 35

ES II set 1 Date: July 2017 Class XII Sec. Time: 1 1/2 Hrs. Informatics Practices answer key M.M.: 35 Name Roll No. Instruction: a) Attempt all questions neatly. 1. (a) A table books has 12 rows and 16