{"id":25561,"date":"2022-01-25T12:05:38","date_gmt":"2022-01-25T06:35:38","guid":{"rendered":"https:\/\/infinitylearn.com\/surge\/?p=25561"},"modified":"2024-02-21T18:50:26","modified_gmt":"2024-02-21T13:20:26","slug":"important-questions-for-class-12-computer-science-c-database-concepts","status":"publish","type":"post","link":"https:\/\/infinitylearn.com\/surge\/important-questions\/class-12\/computer-science\/important-questions-for-class-12-computer-science-c-database-concepts\/","title":{"rendered":"Important Questions for Class 12 Computer Science (C++) \u2013 Database Concepts"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_37 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" style=\"display: none;\"><label for=\"item\" aria-label=\"Table of Content\"><span style=\"display: flex;align-items: center;width: 35px;height: 30px;justify-content: center;\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/label><input type=\"checkbox\" id=\"item\"><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' style='display:block'><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/infinitylearn.com\/surge\/important-questions\/class-12\/computer-science\/important-questions-for-class-12-computer-science-c-database-concepts\/#Important_Questions_for_Class_12_Computer_Science_C_-_Database_Concepts\" title=\"Important Questions for Class 12 Computer Science (C++) \u2013 Database Concepts\">Important Questions for Class 12 Computer Science (C++) \u2013 Database Concepts<\/a><ul class='ez-toc-list-level-3'><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/infinitylearn.com\/surge\/important-questions\/class-12\/computer-science\/important-questions-for-class-12-computer-science-c-database-concepts\/#Previous_Years_Examination_Questions_2_Marks_Questions\" title=\"Previous Years Examination Questions \n 2 Marks Questions\">Previous Years Examination Questions \n 2 Marks Questions<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Important_Questions_for_Class_12_Computer_Science_C_-_Database_Concepts\"><\/span><strong><span style=\"color: #00ccff;\">Important Questions for Class 12 Computer Science (C++) \u2013 Database Concepts<\/span><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3 style=\"text-align: center;\"><span class=\"ez-toc-section\" id=\"Previous_Years_Examination_Questions_2_Marks_Questions\"><\/span><span style=\"color: #0000ff;\">Previous Years Examination Questions<\/span><br \/>\n<span style=\"color: #0000ff;\"> 2 Marks Questions<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"color: #eb4924;\"><strong>Question 1:<\/strong><\/span><br \/>\nObserve the following table MEMBER carefully and write the name of the RDBMS operation out of (i) SELECTION (ii) PROJECTION (iii) UNION (iv) CARTESIAN PRODUCT, which has been used to produce the output as shown in RESULT. Also, find the Degree and Cardinality of the RESULT:<span style=\"text-decoration: underline;\"><strong> All India 2017<\/strong><\/span><br \/>\n<span style=\"color: #008000;\"><strong>Answer:<\/strong><\/span><br \/>\nRDBMS Operation \u2192 SELECTION<br \/>\nDegree of table RESULT = 3<br \/>\nCardinality of table RESULT = 1<\/p>\n<p><strong><span style=\"color: #eb4924;\">Question 2:<\/span><\/strong><br \/>\nObserve the following PARTICIPANTS and EVENTS tables carefully and write the name of the RDBMS operation which will be used to produce the output as shown in RESULT? Also, find the Degree and Cardinality of the RESULT. <span style=\"text-decoration: underline;\"><strong>All India 2016<\/strong><\/span><br \/>\n<span style=\"color: #008000;\"><strong>Answer:<\/strong><\/span><br \/>\nRDBMS Operation \u2192 Cartesian Product<br \/>\nDegree \u2192 4, Cardinality \u2192 6<\/p>\n<p><strong><span style=\"color: #eb4924;\">Question 3:<\/span><\/strong><br \/>\nObserve the following STUDENTS and EVENTS tables carefully and write the name of the RDBMS operation which will be used to produce the output as shown in LIST. Also, find the Degree and Cardinality of the LIST. <span style=\"text-decoration: underline;\"><strong>Delhi 2016<\/strong><\/span><br \/>\n<span style=\"color: #008000;\"><strong>Answer:<\/strong><\/span><br \/>\nRDBMS Operation \u2192 Cartesian Product<br \/>\nDegree \u2192 4, Cardinalitv \u2192 6<\/p>\n<p><strong><span style=\"color: #eb4924;\">Question 4:<\/span><\/strong><br \/>\nObserve the following table carefully and write the names of the most appropriate columns, which can be considered as<br \/>\n(i) Candidate keys and (ii) Primary key. <span style=\"text-decoration: underline;\"><strong>Delhi 2015<\/strong><\/span><\/p>\n<p><span style=\"color: #008000;\"><strong>Answer:<\/strong><\/span><br \/>\n(i) Candidate Keys \u2192 Id, Product<br \/>\n(ii) Primary Key \u2192 Id<\/p>\n<p><strong><span style=\"color: #eb4924;\">Question 5:<\/span><\/strong><br \/>\nObserve the following table carefully and write the names of the most appropriate columns, which can be considered as (i) Candidate keys and (ii) Primary key:<span style=\"text-decoration: underline;\"><strong> All India 2015<\/strong><\/span><\/p>\n<p><span style=\"color: #008000;\"><strong>Answer:<\/strong><\/span><br \/>\n(i) Candidate Keys \u2192 Code, Item<br \/>\n(ii) Primary Key \u2192 Code<\/p>\n<p><strong><span style=\"color: #eb4924;\">Question 6:<\/span><\/strong><br \/>\nObserve the following table carefully and find the degree and cardinality of the table : <span style=\"text-decoration: underline;\"><strong>All India 2018 (C)<\/strong><\/span><\/p>\n<p><span style=\"color: #008000;\"><strong>Answer:<\/strong><\/span><br \/>\nDegree \u2192 3, Cardinality \u2192 5<\/p>\n<p><strong><span style=\"color: #eb4924;\">Question 7:<\/span><\/strong><br \/>\nObserve the following table and answer the parts (i) and (ii): <span style=\"text-decoration: underline;\"><strong>All India 2014 (C)<\/strong><\/span><\/p>\n<p>(i) In the above table, can we have Qty as primary key? [Answer as yes\/no]. Justify your answer.<br \/>\n(ii) What is the cardinality and degree of the above table?<br \/>\n<span style=\"color: #008000;\"><strong>Answer:<br \/>\n<\/strong><\/span>(i) No, Qty cannot have as primary key because it is not uniquely identify in a table.<br \/>\n(ii) Cardinality \u2192 5, Degree \u2192 4<\/p>\n<p><strong><span style=\"color: #eb4924;\">Question 8:<\/span><\/strong><br \/>\nExplain the concept of Cartesian Product between two tables, with the help of appropriate example. <span style=\"text-decoration: underline;\"><strong>All India 2014<\/strong><\/span><\/p>\n<p style=\"text-align: center;\"><em>Or <\/em><\/p>\n<p>Illustrate cartesian product operation between the two tables\/relations using a suitable example. <span style=\"text-decoration: underline;\"><strong>Delhi 2012 (C)<br \/>\n<\/strong><\/span><strong><span style=\"color: #008000;\">Answer:<\/span><br \/>\n<\/strong>Cartesian Product The cartesian product means the cross join of two relations and the resultant relation will contain all the possible combinations of the tuples from the two tables, i.e. the cardinality of the resulting relation will be equal to the product of cardinalities of the two relations. It is denoted by \u2018x\u2019 symbol.<br \/>\nThe two tables GABS1 and GABS2 are as follows:<\/p>\n<p>The cartesian product of above two tables is as follows:<\/p>\n<p><span style=\"color: #eb4924;\"><strong>Question 9:<\/strong><\/span><br \/>\nExplain the concept of candidate keys with the help of an appropriate example. <span style=\"text-decoration: underline;\"><strong>All India 2013<\/strong><\/span><\/p>\n<p style=\"text-align: center;\"><em>Or<\/em><\/p>\n<p>What do you understand by candidate key in a table? Give a suitable example of candidate key from a table containing some meaningful data. <span style=\"text-decoration: underline;\"><strong>Delhi 2010.2009<br \/>\n<\/strong><\/span><span style=\"color: #008000;\"><strong>Answer:<br \/>\n<\/strong><\/span>A candidate key is a set of one or more attributes that uniquely identify in a table. There can be multiple candidate keys in one table. Each candidate key can work as a primary key.<\/p>\n<p><strong><span style=\"color: #eb4924;\">Question 10:<\/span><\/strong><br \/>\nWhat is the difference between degree and cardinality of a table? What is the degree and cardinality of the following table?<br \/>\n<span style=\"text-decoration: underline;\"><strong>Delhi 2013<\/strong><\/span><\/p>\n<p><span style=\"color: #008000;\"><strong>Answer:<br \/>\n<\/strong><\/span><strong>Degree<\/strong> The number of attributes or columns in a table is called the degree of the table. The degree of the given table is : 3.<br \/>\n<strong>Cardinality<\/strong> The number of rows or records in a table is called ,the cardinality of the table. The cardinality of the given table is : 2.<\/p>\n<p><strong><span style=\"color: #eb4924;\">Question 11:<\/span><\/strong><br \/>\nDifferentiate between the primary key and alternate key of a table with the help of an example. <span style=\"text-decoration: underline;\"><strong>Delhi 2013C<\/strong> <\/span><\/p>\n<p style=\"text-align: center;\"><em>Or<\/em><\/p>\n<p>Give a suitable example of a table with sample data and illustrate primary and alternate keys in it. <span style=\"text-decoration: underline;\"><strong>All India 2012.2011;<\/strong> <strong>Delhi 2011 (c)<br \/>\n<\/strong><\/span><span style=\"color: #008000;\"><strong>Answer:<br \/>\n<\/strong><\/span><strong>Primary Key<\/strong> It\u2019s a column or set of columns that helps to identify records uniquely. One table can have only one primary key.<br \/>\n<strong>Alternate Key\/Secondary Key<\/strong> It\u2019s a column or set of columns that can act as a primary key but not selected as a primary key.<\/p>\n<p>e.g. In table Student, RollNo and AdmNo of all students are different.<br \/>\nBoth of them can be selected as primary key. Suppose we have selected RollNo as a primary key then AdmNo is called as alternate key.<\/p>\n<p><strong><span style=\"color: #eb4924;\">Question 12:<\/span><\/strong><br \/>\nGive suitable example of a table with sample data and illustrate primary and candidate keys in it. <span style=\"text-decoration: underline;\"><strong>Delhi 2012<br \/>\n<\/strong><\/span><span style=\"color: #008000;\"><strong>Answer:<br \/>\n<\/strong><\/span>The table student is as follows:<\/p>\n<p>Here, AdmNo and RollNo both can identify records uniquely. So, both are candidate keys, and from them we can also make AdmNo as a primary key.<\/p>\n<p><strong><span style=\"color: #eb4924;\">Question 13:<\/span><\/strong><br \/>\nWhat do you mean by union and cartesian product operation in relational algebra? <span style=\"text-decoration: underline;\"><strong>Delhi 2011<br \/>\n<\/strong><\/span><span style=\"color: #008000;\"><strong>Answer:<br \/>\n<\/strong><\/span><strong>Union<\/strong> (binary operator) It operates on two relations and is indicated by \u2018\u222a\u2019.<br \/>\n<strong>Cartesian Product<\/strong> (binary operator) It operates on two relations and is denoted by \u2018\u00d7\u2019. e.g. cartesian product of two relations R1 and R2 is represented by R = R1 x R2. The degree of R is equal to sum of degrees of R1 and R2. The cardinality of R is product of cardinality of R1 and cardinality of R2.<br \/>\ne.g. R = R1 \u222a R2 represents union operation between two relations R1 and R2. The degree of R is equal to degree of R1. The cardinality of R is sum of cardinality of R1 and cardinality of R2.<\/p>\n<p><span style=\"color: #eb4924;\"><strong>Question 14:<\/strong><\/span><br \/>\nWhat do you understand by selection and projection operation in relational algebra? <span style=\"text-decoration: underline;\"><strong>All India 2011<br \/>\n<\/strong><\/span><span style=\"color: #008000;\"><strong>Answer:<\/strong><\/span><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"color: #eb4924;\"><strong>Question 15:<\/strong><\/span><br \/>\nWhat do you understand by primary key? Give a suitable example of primary key from a table containing some meaningful data. <span style=\"text-decoration: underline;\"><strong>All India 2010<br \/>\n<\/strong><\/span><span style=\"color: #008000;\"><strong>Answer:<\/strong><\/span><span style=\"text-decoration: underline;\"><strong><br \/>\n<\/strong><\/span>A primary key is a set of one or more attributes that can uniquely identify tuples within the relation.<br \/>\ne-g.<\/p>\n<p>The attribute ItemNo is a primary key as it contains unique value for each tuple in a relation.<\/p>\n<p><strong><span style=\"color: #eb4924;\">Question 16:<\/span><\/strong><br \/>\nWhat is the purpose of a key in a table? Give an example of a key in a table. <span style=\"text-decoration: underline;\"><strong>All India 2009<br \/>\n<\/strong><\/span><span style=\"color: #008000;\"><strong>Answer:<\/strong><\/span><br \/>\nA key is used to identify a tuple uniquely within the relation. The value of key is unique. No rows in the relation can have same value, e.g. in an Employee relation EmpCode is a key, using EmpCode one can obtain the information of a particular employee.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Important Questions for Class 12 Computer Science (C++) \u2013 Database Concepts Previous Years Examination Questions 2 Marks Questions Question 1: [&hellip;]<\/p>\n","protected":false},"author":31,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_focuskw":"","_yoast_wpseo_title":"","_yoast_wpseo_metadesc":"\"Get Important Questions for Class 12 Computer Science (C++) \u2013 Database Concepts on Infinity Learn.\"","custom_permalink":"important-questions\/class-12\/computer-science\/important-questions-for-class-12-computer-science-c-database-concepts\/"},"categories":[93],"tags":[],"table_tags":[],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v17.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Important Questions for Class 12 Computer Science (C++) \u2013 Database Concepts - 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