ES I INFORMATICS PRACTICES Set I Class XII Sec- A,B,C Date: April 2017 Time: 1 hr 10 min M.M.: 30

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1 ES I INFORMATICS PRACTICES Set I Class XII Sec- A,B,C Date: April 2017 Time: 1 hr 10 min M.M.: 30 Name Roll No. Instruction: a) Attempt all questions 1. a) Table Stud has 20 rows and 15 columns. Table dept has 17 rows and 8 columns? What will be the cardinality and degree of the Cartesian product of the 2 tables? 2 D-23 C- 340 b) Differentiate between 2 Select avg(*) from stud; And Select avg(fee) from stud; with suitable example. 2 Select avg(*) from stud; error Select avg(fee) from stud will give the average of the column fee ignoring the null values c) Create the table stud with the given constraints COLUMN NAME DATA TYPE(SIZE) CONSTRAINT ADMNO INTEGER(3) PRIMARY KEY NAME CHAR(25) STIPEND DECIMAL(8,2) CHECK > 1000 STREAM CHAR(15) DEFAULT SCIENCE MARKS DECIMAL(6,2) DATEOFADM DATE NOT NULL Create table stud (admno integer(3) primary key,name char(25), stipend decimal(8,2) check(stipend between to ), stream char(15) DEFAULT SCIENCE, marks decimal(6,2), dateofadm date not null); d) Give the command 2 (i) To view the active database. Select database(); (ii) To view all the tables present in a database STUDENT. XII / IP Page 1 of 9

2 2. Use student Show tables; e) Explain Commit with example. 2 COMMIT permanently saves the transaction AUTOCOMMIT- by default SQL has autocommit on which means if we do not start a transaction explicitly through BEGIN o START TRANSACTION command then every statement is considered to be one transaction and is committed there and then Set autocommit=1 means autommit is enabled Set autocommit= 0 means autommit is disabled a) Differentiate between Primary and Unique key. Are all candidate keys same as Primary key. If not how are they different? 2 Primary Key: It is a field or collection of fields through which a record can be uniquely identified in a table. Primary keys may consist of a single attribute or multiple attributes in combination. Unique - This constraint is same as primary key but can accept NULL values Candidate Key: All attribute combinations in a table that can serve as primary key are called candidate key. They behave the candidate for the primary key. Each table may have one or more candidate keys. No all candidate keys are not primary key. b) What do you mean by Foreign Key? Create a foreign key and explain. 2 Foreign key : The attribute of a table( child table) which is a primary key for another table ( parent table). It establish a relationship or reference between the two tables. 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) ); c) Give the command to add name of char type with width 20 and remove address from the table stud. 2 Alter table stud Add name char(20), drop address; XII / IP Page 2 of 9

3 d) For the following table Employee write commands in MySql for (i) to (vii) and output for (viii) and (ix) 9 Code FName Department Salary GENDER 101 HARKIRAT Sales M 102 SIDDHARTH Personnel M 103 LAKSHITTA Accounts F 104 KANISHK Accounts M 105 DIVYANSHU Sales M i. Display the names of all employees whose Ecode is either101 or 103 or 108 OR 109. Select fname from employee where code in(101,103,108,109); ii. Display the unique Department names. Select distinct department from employee; iii. Delete the row with department as Sales and where salary is blank. Delete from employee where salary is NULL and department = Sales ; iv. Decrease the salary by of employees whose First name begins with "A" and has second last character A. Update employee set salary =salary where name like A%A_ ; v. Display employee details in descending order of salary. Select * from employee order by salary desc; vi. Add a new row in employee table with code as 106 and first name as Rishabh. Insert into employee Values(106, Rishabh,null,null,null); vii. viii. ix. Display the fname and department name in upper case. Select upper(fname),upper(department) from employee; SELECT COUNT ( DISTINCT department) FROM employee; COUNT ( DISTINCT department) 4 SELECT avg(salary) FROM employee; avg(salary) a) What is ICT and how has it impacted the society. 1 Information and Communications Technology (ICT) Impact of ICT on society Social networking sites help people to remain in touch with their near and dears Social networking sites help people to work together for social cause E-Governance sites help them to save their time,energy and cost. E-learning sites help student to get quality study material and research on any topic. XII / IP Page 3 of 9

4 Helps in conservation of fuel and environment. b) Explain front end with example. 1 FRONT END INTERFACE: The front end application controls communication between end users. For software applications, front end is the same as user interface. The front-end of an IT application is usually a group of one or more forms through which the user enters the input values and is shown the corresponding output. In client/server applications, the client part of the program is often called the front end and the server part is called the back end. A good user interface needs to have following features. Clear,Concise,Familiar,Responsive,Consistent,Attractive,Efficient c) Give the main impact of e-governance 1 e-governance The application of electronic means in governance with an aim of providing information and services to the citizens of the nation and fulfilling the requirements of common man at affordable costs and in fastest possible time and creating a comfortable, transparent, and economic interaction between government and its citizens. Societal Impacts: 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. d) Mr. Anurag who has been working as Manager in Inkrakeys Enterprises wants to create a form in NetBeans to take various inputs from user. Give the appropriate swing control. 2 S.No. Function 1. Display picture Label 2. Enter id Text field 3. Select Department from available List of Radio button Departments 4. Choose Hobbies of an Employee List/check box (Singing/Dancing/Skating/Swimming) XII / IP Page 4 of 9

5 ES I INFORMATICS PRACTICES Set II Class XII Sec- A,B,C Date: 2017 Time: 1 hr 10 min M.M.: 30 Name Roll No. Instruction: b) Attempt all questions 1. f) Table Emp has 10 rows and 6 columns. Table dept has 17 rows and 5 columns? What will be the cardinality and degree of the Cartesian product of the 2 tables? 2 C-170 D- 11 g) Differentiate between 2 Select count(*) from student; And Select count(stream) from student; Select count(*) from student; - Will count the total records in the table student Select count(stream) from student; Will only count those records where stream is not NULL from the table student h) Create the table employee with the given constraints 2 COLUMN NAME DATA TYPE(SIZE) CONSTRAINT EMPNO INTEGER(5) PRIMARY KEY NAME CHAR(20) NOT NULL STIPEND DECIMAL(10,2) CHECK >= and <= DEPARTMENT CHAR(15) DOJ DATE Default Create table employee (empno integer(5) primary key,name char(20) not null, stipend decimal(10,2) check stipend between and , department char(15), doj date default ); i) Explain Rollback with example? 2 ROLLBACK aborts transaction and does not save any of the changes made to the database during the transaction. XII / IP Page 5 of 9

6 Update emp Set salary=salary*1.15 Where salary >5000; Rollback; will not save the changes to the database. j) Give the commands (i) To add the constraint NOT NULL to name of type char and width 20 to an existing table SCHOOL. Alter table school Modify name char(20) not null; (ii) To remove the constraint primary key from the table UNIVERSITY. Alter table UNIVERSITY Drop primary key; 2. a) Differentiate between Primary and Candidate key. Is candidate key same as alternate key if not how are they different? 2 Primary Key: It is a field or collection of fields through which a record can be uniquely identified in a table. Primary keys may consist of a single attribute or multiple attributes in combination. Candidate Key: All attribute combinations in a table that can serve as primary key are called candidate key. They behave the candidate for the primary key. Each table may have one or more candidate keys. The UNIQUE and PRIMARY KEY constraints both guarantee for uniqueness of a column or set of columns. All alternate keys are candidate keys. c) What do you mean by Foreign Key? Create a foreign key and explain. 2 Foreign key : The attribute of a table( child table) which is a primary key for another table ( parent table). It establish a relationship or reference between the two tables. Create table dept ( Deptnumb int(2) PRIMARY KEY, Deptname varchar(10) ); Create table emp ( Empno Empname int(5) PRIMARY KEY, varchar(30), XII / IP Page 6 of 9

7 ); Deptno int(2), Sal decimal(7,2), foreign key (deptno) references dept(deptnumb) d) Give the command to remove name and add address of char type with width 20 in the table stud. 2 Alter table stud Add address char(20), drop name; b) Consider the following table Student Write commands in MySql for (i) to (vii) and output for (viii) and (ix) 9 RNo Name Subject Marks Gender 1 PRATEEK IP 68 M 2 APOORVA IP 69 F 3 SMITA Biology 67 F 4 RISHABH Accounts 55 M 5 KUSH IP M 6 TANISHA Accounts 45 F (i) To display the names of male students in descending order of NAME. Select name from student where gender = M order by name; (ii) To display a report listing NAME, SUBJECT where Marks is either 24 or 37 or45 or 36. Select name,subject from student where average in (24,37,45,36); (iii) Increase the Marks by 5 of all students where name begins with DAand ends with k. Update student Set marks=marks+5 where name like DA%k ; (iv) Display the count of unique subjects. SELECT COUNT (DISTINCT Subject) FROM student; (v) Delete the rows where marks are not given. Delete from student where marks is NULL; XII / IP Page 7 of 9

8 3. (vi) Display the last 3 characters of the name. Select right(name,3) from student; (vii) Display the name and the length of the name of all students in descending order of marks. Select name,length(name) from student order by marks desc; (viii) SELECT COUNT (Subject) FROM student; COUNT (Subject) 6 (ix) SELECT max (Marks) FROM student WHERE gender= F ; max (Marks) 69 a) What is the impact of e-governance sites. 1 Societal Impacts: e-governance 3. Positive impact f. It improves the efficiency of administration and service delivery. g. Reduced waiting time for the work completion. h. Reduced the cost of availing the service. i. Successful in keeping a tab on corruption to some extent. j. Increased public participation. 4. Negative Impact d. People living in rural or remote area could not benefited due to lack of computerization. e. Manual methods cannot be avoided. f. Lack of awareness amongst people. b) What is ICT and how has it impacted our economy. 1 Economy is impacted in the following ways The transactions are completed in lesser time. With less cost and energy. Economy is impacted as ICT leads to fast completion of data transfer and data processing jobs. ICT also brings transparency in the administration c) Explain back end with example. 1 BACK END DATABASE: It is a database that is accessed by users indirectly through an external application rather than application programming stored within the database. The back-end of an IT application is the database in which all the data is stored. This database resides in the server. All the data which is request by the front-end is supplied by back-end. A XII / IP Page 8 of 9

9 good back-end ensures sustainability, efficiency application. and easy modification of the d) Mr. Dev who has been working as Manager in Kuber Enterprises wants to create a form in NetBeans to take various inputs from user. Give the appropriate swing control 2 S.No. Function Control 1. To give Enter Message Label 2. Enter id Text Field 3. Select Department Combo Box/Radio Button 4. Display/Give feedback about examination Text area system XII / IP Page 9 of 9

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

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