{"id":160336,"date":"2023-09-26T13:05:45","date_gmt":"2023-09-26T07:35:45","guid":{"rendered":"https:\/\/www.gkseries.com\/blog\/?p=160336"},"modified":"2023-09-26T13:05:45","modified_gmt":"2023-09-26T07:35:45","slug":"consider-the-following-four-relational-schemas-for-each-schema-all-non-trivial-functional-dependencies-are-listed","status":"publish","type":"post","link":"https:\/\/www.gkseries.com\/blog\/consider-the-following-four-relational-schemas-for-each-schema-all-non-trivial-functional-dependencies-are-listed\/","title":{"rendered":"Consider the following four relational schemas. For each schema, all non-trivial functional dependencies are listed"},"content":{"rendered":"\n

Q. <\/span>Consider the following four relational schemas. For each schema, all non-trivial functional<\/span> <\/span>dependencies<\/span> <\/span>are<\/span> <\/span>listed.<\/span> <\/span>The<\/span> <\/span>underlined<\/span> <\/span>attributes are<\/span> <\/span>the<\/span> <\/span>respective<\/span> <\/span>primary<\/span> <\/span>keys.<\/span> <\/span><\/div><\/p>\n\n\n\n

Schema I: Registration (rollno<\/u>, courses)<\/em><\/p>\n\n\n\n

Field \u2018courses<\/em>\u2019 is a set-valued attribute containing the set of courses a student has registered for.<\/p>\n\n\n\n

Non-trivial functional dependency:<\/p>\n\n\n\n

rollno <\/em>\u00ae courses<\/em><\/p>\n\n\n\n

Schema II: Registration (rollno, courseid<\/u>, email)<\/em><\/p>\n\n\n\n

Non-trivial functional dependencies:<\/p>\n\n\n\n

rollno, courseid <\/em>\u00ae email email <\/em>\u00ae rollno<\/em><\/p>\n\n\n\n

Schema III: Registration (rollno, courseid<\/u>, marks, grade)<\/em><\/p>\n\n\n\n

Non-trivial functional dependencies:<\/p>\n\n\n\n

rollno, courseid <\/em>\u00ae marks, grade marks <\/em>\u00ae grade<\/em><\/p>\n\n\n\n

Schema IV: Registration (rollno, courseid<\/u>, credit)<\/em><\/p>\n\n\n\n

Non-trivial functional dependencies:<\/p>\n\n\n\n

rollno, courseid <\/em>\u00ae credit courseid <\/em>\u00ae credit<\/em><\/p>\n\n\n\n

Which one of the relational schemas above is in 3NF but not in BCNF?<\/p>\n\n\n\n

(A) Schema I\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/p>\n\n\n\n

(B) Schema II\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/p>\n\n\n\n

(C) Schema III\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/p>\n\n\n\n

(D) Schema IV<\/p>\n\n\n\n

Ans: Schema II<\/p>\n","protected":false},"excerpt":{"rendered":"

Q. Consider the following four relational schemas. For each schema, all non-trivial functional dependencies are listed. The underlined attributes are the respective primary keys. Schema I: Registration (rollno, courses) Field \u2018courses\u2019 is a set-valued attribute containing the set of courses a student has registered for. Non-trivial functional dependency: rollno \u00ae courses Schema II: Registration (rollno, […]<\/p>\n","protected":false},"author":419,"featured_media":160337,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[5141],"tags":[5140],"class_list":["post-160336","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-gate","tag-gate-questions"],"_links":{"self":[{"href":"https:\/\/www.gkseries.com\/blog\/wp-json\/wp\/v2\/posts\/160336","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.gkseries.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.gkseries.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.gkseries.com\/blog\/wp-json\/wp\/v2\/users\/419"}],"replies":[{"embeddable":true,"href":"https:\/\/www.gkseries.com\/blog\/wp-json\/wp\/v2\/comments?post=160336"}],"version-history":[{"count":1,"href":"https:\/\/www.gkseries.com\/blog\/wp-json\/wp\/v2\/posts\/160336\/revisions"}],"predecessor-version":[{"id":160338,"href":"https:\/\/www.gkseries.com\/blog\/wp-json\/wp\/v2\/posts\/160336\/revisions\/160338"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.gkseries.com\/blog\/wp-json\/wp\/v2\/media\/160337"}],"wp:attachment":[{"href":"https:\/\/www.gkseries.com\/blog\/wp-json\/wp\/v2\/media?parent=160336"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.gkseries.com\/blog\/wp-json\/wp\/v2\/categories?post=160336"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.gkseries.com\/blog\/wp-json\/wp\/v2\/tags?post=160336"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}