{"id":10300,"date":"2018-02-16T18:18:08","date_gmt":"2018-02-16T12:48:08","guid":{"rendered":"http:\/\/mycbseguide.com\/blog\/?p=10300"},"modified":"2018-03-16T10:46:31","modified_gmt":"2018-03-16T05:16:31","slug":"databases-management-class-12-notes-computer-science","status":"publish","type":"post","link":"https:\/\/mycbseguide.com\/blog\/databases-management-class-12-notes-computer-science\/","title":{"rendered":"Databases Management class 12 Notes Computer Science"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_76 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\" style=\"cursor:inherit\">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\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><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><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 eztoc-toggle-hide-by-default' ><ul class='ez-toc-list-level-2' ><li class='ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/mycbseguide.com\/blog\/databases-management-class-12-notes-computer-science\/#CBSE_Guide_Databases_Management_class_12_Notes_Computer_Science\" >CBSE Guide Databases Management class 12 Notes Computer Science<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/mycbseguide.com\/blog\/databases-management-class-12-notes-computer-science\/#12_Computer_Science_notes_Chapter_3_Databases_Management\" >12 Computer Science notes Chapter 3 Databases Management<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/mycbseguide.com\/blog\/databases-management-class-12-notes-computer-science\/#Download_Revision_Notes_as_PDF\" >Download Revision Notes as PDF<\/a><ul class='ez-toc-list-level-2' ><li class='ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/mycbseguide.com\/blog\/databases-management-class-12-notes-computer-science\/#Databases_Management_class_12_Notes_Computer_Science\" >Databases Management class 12 Notes Computer Science<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/mycbseguide.com\/blog\/databases-management-class-12-notes-computer-science\/#CBSE_Class-12_Revision_Notes_and_Key_Points\" >CBSE Class-12 Revision Notes and Key Points<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<p>CBSE class 12 Computer Science Databases Management class 12 Notes Computer Science in PDF are available for free download in myCBSEguide mobile app. The best app for CBSE students now provides Databases Management class 12 Notes Computer Science latest chapter wise notes for quick preparation of CBSE board exams and school based annual examinations. Class 12 Computer Science notes on chapter 3 Databases Management Computer Science are also available for download in CBSE Guide website.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"CBSE_Guide_Databases_Management_class_12_Notes_Computer_Science\"><\/span><strong>CBSE Guide Databases Management class 12 Notes Computer Science<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>CBSE guide notes are the comprehensive notes which covers the latest syllabus of CBSE and NCERT. It includes all the topics given in NCERT class 12 Computer Science text book. Users can download CBSE guide quick revision notes from myCBSEguide mobile app and my CBSE guide website.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"12_Computer_Science_notes_Chapter_3_Databases_Management\"><\/span><strong>12 Computer Science notes Chapter 3 Databases Management<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Download CBSE class 12th revision notes for chapter 3 Databases Management in PDF format for free. Download revision notes for Databases Management class 12 Notes Computer Science and score high in exams. These are the Databases Management class 12 Notes prepared by team of expert teachers. The revision notes help you revise the whole chapter 3 in minutes. Revision notes in exam days is one of the best tips recommended by teachers during exam days.<\/p>\n<h1 style=\"text-align: center\"><span class=\"ez-toc-section\" id=\"Download_Revision_Notes_as_PDF\"><\/span><a href=\"https:\/\/mycbseguide.com\/downloads\/cbse-class-12-computer-science\/1851\/cbse-revision-notes\/7\/\">Download Revision Notes as PDF<\/a><span class=\"ez-toc-section-end\"><\/span><\/h1>\n<p style=\"text-align: center\"><strong>CBSE Class 12 Computer Science 3<\/strong><br \/>\n<strong>Databases Management class 12 Notes Computer Science<br \/>\nRevision Notes (Database\u00a0Concepts and SQL)<\/strong><\/p>\n<p><strong>Relations:<\/strong> In relational data model, the data is organised into tables(in the form of rows and columns) called relations.<\/p>\n<p><strong>Domain:<\/strong> A domain is the sets of values from\u00a0which the actual values appearing in a given column are drawn.<\/p>\n<p><strong>Tuple:<\/strong> A row in a relation.<\/p>\n<p><strong>Attribute:<\/strong> A column in a relation.<\/p>\n<p><strong>Primary Key:<\/strong> A column or set of columns that uniquely identifies a row within a table is called primary key.<\/p>\n<p><strong>Candidate Key:<\/strong> Candidate keys are set of fields (columns with unique values) in the relation that are eligible to act as a primary key.<\/p>\n<p><strong>Alternate Key:<\/strong> A candidate key that is not the primary key is called alternate key.<\/p>\n<p><strong>DDL:<\/strong> Data Definition Language (DDL) or Data Description Language (DDL).<\/p>\n<p><strong>DML:<\/strong> Data Manipulation Language (DML).<\/p>\n<p><strong>String datatypes:<\/strong> CHAR, VARCHAR, VARCHAR2<\/p>\n<p><strong>Numeric datatype:<\/strong> NUMBER, NUMERIC, INT, FLOAT, DECIMAL<\/p>\n<p><strong>Date:<\/strong> DATE<\/p>\n<p><strong>Selection:<\/strong> Selection in relational algebra returns those tuples (records) in a relation that fulfil a condition (Produce table containing subset of rows).<\/p>\n<p><strong>Projection:<\/strong> Projection in relational algebra returns those columns in a relation that given in the attribute list (Produce table containing subset of columns).<\/p>\n<p><strong>Union:<\/strong> The union operator is used to combine two or more tables. In the union operation, duplicate records will be automatically removed from the resultant table.<\/p>\n<p><strong>Cartesian product:<\/strong> SQL joins are used to relate information in different tables. Cartesian product returns a number of rows equal to number of rows in the first table multiply by number of rows in the second table. At the same time, number of columns equal to number of columns in the first table added by number of columns in the second table.<\/p>\n<p><strong>SQL (Structured Query Language)<\/strong><\/p>\n<p><strong>CREATE TABLE:<\/strong> Used to create the structure of a table.<br \/>\nCREATE\u00a0TABLE\u00a0<em>table_name\u00a0<\/em>(<em>column1 datatype<\/em>,<em>\u00a0column2 datatype<\/em>,<em>\u00a0column3 \u00a0datatype<\/em>,&#8230;.);<\/p>\n<p><strong>ALTER TABLE:<\/strong> Used to implement structure modification.<\/p>\n<p><strong>To add a new column after creating table<\/strong>:<br \/>\nALTER\u00a0TABLE\u00a0<em>table_name<\/em>\u00a0ADD\u00a0<em>column_name datatype<\/em>;<\/p>\n<p><strong>To modify an existing column.<\/strong><br \/>\nALTER\u00a0TABLE\u00a0<em>table_name\u00a0<\/em>MODIFY\u00a0COLUMN\u00a0<em>column_name datatype<\/em>;<\/p>\n<p><strong>DROP TABLE:<\/strong> To remove a\u00a0table\u00a0\u00a0and remove all of its data<br \/>\nDROP TABLE\u00a0<em>table_name<\/em>\u00a0;<\/p>\n<p><strong>INSERT INTO:<\/strong> is used to insert new records in a table.<\/p>\n<p>INSERT\u00a0INTO\u00a0<em>table_name<\/em>\u00a0(<em>column1<\/em>,<em>column2<\/em>,<em>column3<\/em>, ..) VALUES(<em>value1<\/em>,<em>\u00a0value2<\/em>,<em>\u00a0value3<\/em>, ..);<\/p>\n<p><strong>SELECT:<\/strong> The SELECT statement is used to select and display data from a database.<br \/>\nSELECT\u00a0<em>column1<\/em>,<em>\u00a0column2, &#8230;\u00a0<\/em>FROM\u00a0<em>table_name<\/em>;<br \/>\nSELECT\u00a0*\u00a0FROM\u00a0<em>table_name<\/em>;<br \/>\nSELECT\u00a0<em>column1<\/em>,<em>\u00a0column2, &#8230;\u00a0<\/em>FROM\u00a0<em>table_name\u00a0<\/em>WHERE\u00a0<em>condition<\/em>;<\/p>\n<p><strong>DISTINCT:<\/strong> Distinct keyword eliminates duplicate rows from the result of a select statement.<br \/>\nSELECT\u00a0DISTINCT\u00a0<em>column1<\/em>,<em>\u00a0column2, &#8230;\u00a0<\/em>FROM\u00a0<em>table_name<\/em>;<\/p>\n<p><strong>ORDER BY :\u00a0<\/strong>Used to sort the result-set in ascending or descending order.<br \/>\nSELECT\u00a0<em>column1<\/em>,<em>\u00a0column2, &#8230;\u00a0<\/em>FROM\u00a0<em>table_name\u00a0<\/em>ORDER\u00a0BY\u00a0<em>\u00a0column1\u00a0&#8230;\u00a0<\/em>ASC|DESC;<\/p>\n<p><strong>GROUP BY : <\/strong>Used with aggregate functions (COUNT, MAX, MIN, SUM, AVG) to group the result-set by one or more columns<br \/>\nSELECT\u00a0<em>column_name(s)\u00a0<\/em>FROM\u00a0<em>table_name\u00a0<\/em>WHERE\u00a0<em>condition <\/em>GROUP\u00a0BY\u00a0<em>column_name(s)<\/em><\/p>\n<p><strong>HAVING : <\/strong>Places condition on groups.<\/p>\n<p>SELECT\u00a0<em>column_name(s)\u00a0<\/em>FROM\u00a0<em>table_name\u00a0<\/em>WHERE\u00a0<em>condition\u00a0<\/em>GROUP\u00a0BY\u00a0<em>column_name(s)\u00a0<\/em>HAVING\u00a0<em>condition<\/em><\/p>\n<p><strong>MAX ():<\/strong> To select the\u00a0maximum value of a particular column.<\/p>\n<p>SELECT\u00a0MAX(<em>column_name<\/em>) FROM\u00a0<em>table_name\u00a0<\/em>WHERE\u00a0<em>condition<\/em>;<\/p>\n<p><strong>MIN ():<\/strong> To select the minimum value of a particular column.<\/p>\n<p>SELECT\u00a0MIN(<em>column_name<\/em>) FROM\u00a0<em>table_name\u00a0<\/em>WHERE\u00a0<em>condition<\/em>;<\/p>\n<p><strong>SUM ():<\/strong> To find the total value of a particular column.<\/p>\n<p>SELECT SUM(<em>column_name<\/em>) FROM\u00a0<em>table_name\u00a0<\/em>WHERE\u00a0<em>condition<\/em>;<\/p>\n<p><strong>AVG ():<\/strong> To find the average value of a particular column.<\/p>\n<p>SELECT AVG(<em>column_name<\/em>) FROM\u00a0<em>table_name\u00a0<\/em>WHERE\u00a0<em>condition<\/em>;<\/p>\n<p><strong>COUNT ():<\/strong>\u00a0Returns the number of records in the table.<\/p>\n<p>SELECT\u00a0COUNT(<em>column_name<\/em>) FROM\u00a0<em>table_name\u00a0<\/em>WHERE\u00a0<em>condition<\/em>;<\/p>\n<p><strong>UPDATE : <\/strong>Used to modify the existing records in a table.<\/p>\n<p>UPDATE\u00a0<em>table_name\u00a0<\/em>SET\u00a0<em>column1\u00a0<\/em>=<em>\u00a0value1<\/em>,<em>\u00a0column2\u00a0<\/em>=<em>\u00a0value2<\/em>, &#8230;WHERE\u00a0<em>condition<\/em>;<\/p>\n<p><strong>DELETE :<\/strong> Used to delete existing records in a table.<\/p>\n<p>DELETE\u00a0FROM\u00a0<em>table_name\u00a0<\/em>WHERE\u00a0<em>condition<\/em>;<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Databases_Management_class_12_Notes_Computer_Science\"><\/span>Databases Management class 12 Notes Computer Science<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li>CBSE Revision notes (PDF Download) Free<\/li>\n<li>CBSE Revision notes for Class 12 Computer Science PDF<\/li>\n<li>CBSE Revision notes Class 12 Computer Science \u2013 CBSE<\/li>\n<li>CBSE Revisions notes and Key Points Class 12 Computer Science<\/li>\n<li>Summary of the NCERT books all chapters in Computer Science class 12<\/li>\n<li>Short notes for CBSE class 12th Computer Science<\/li>\n<li>Key notes and chapter summary of Computer Science class 12<\/li>\n<li>Quick revision notes for CBSE board exams<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"CBSE_Class-12_Revision_Notes_and_Key_Points\"><\/span><strong>CBSE Class-12 Revision Notes and Key Points<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Databases Management class 12 Notes Computer Science. CBSE quick revision note for class-12 Computer Science, Chemistry, Math\u2019s, Biology and other subject are very helpful to revise the whole syllabus during exam days. The revision notes covers all important formulas and concepts given in the chapter. Even if you wish to have an overview of a chapter, quick revision notes are here to do if for you. These notes will certainly save your time during stressful exam days.<\/p>\n<ul>\n<li><a href=\"http:\/\/mycbseguide.com\/downloads\/cbse-class-12-physics\/1251\/cbse-revision-notes\/7\/\">Revision Notes for class-12 Physics<\/a><\/li>\n<li><a href=\"http:\/\/mycbseguide.com\/downloads\/cbse-class-12-chemistry\/1267\/cbse-revision-notes\/7\/\">Revision Notes for class-12 Chemistry<\/a><\/li>\n<li><a href=\"http:\/\/mycbseguide.com\/downloads\/cbse-class-12-mathematics\/1284\/cbse-revision-notes\/7\/\">Revision Notes for class-12 Mathematics<\/a><\/li>\n<li><a href=\"http:\/\/mycbseguide.com\/downloads\/cbse-class-12-biology\/1298\/cbse-revision-notes\/7\/\">Revision Notes for class-12 Biology<\/a><\/li>\n<li><a href=\"http:\/\/mycbseguide.com\/downloads\/cbse-class-12-accountancy\/1315\/cbse-revision-notes\/7\/\">Revision Notes for class-12 Accountancy<\/a><\/li>\n<li><a href=\"http:\/\/mycbseguide.com\/downloads\/cbse-class-12-economics\/1327\/cbse-revision-notes\/7\/\">Revision Notes for class-12 Economics<\/a><\/li>\n<li><a href=\"http:\/\/mycbseguide.com\/downloads\/cbse-class-12-business-studies\/1727\/cbse-revision-notes\/7\/\">Revision Notes for class-12 Business Studies<\/a><\/li>\n<li><a href=\"http:\/\/mycbseguide.com\/downloads\/cbse-class-12-computer-science\/1851\/cbse-revision-notes\/7\/\">Revision Notes for class-12 Computer Science<\/a><\/li>\n<li><a href=\"http:\/\/mycbseguide.com\/downloads\/cbse-class-12-informatics-practices\/1873\/cbse-revision-notes\/7\/\">Revision Notes for class-12 Informatics Practices<\/a><\/li>\n<li><a href=\"http:\/\/mycbseguide.com\/downloads\/cbse-class-12-english-core\/1855\/cbse-revision-notes\/7\/\">Revision Notes for class-12 English Core<\/a><\/li>\n<li><a href=\"http:\/\/mycbseguide.com\/downloads\/cbse-class-12-history\/1869\/cbse-revision-notes\/7\/\">Revision Notes for class-12 History<\/a><\/li>\n<li><a href=\"http:\/\/mycbseguide.com\/downloads\/cbse-class-12-physical-education\/1877\/cbse-revision-notes\/7\/\">Revision Notes for class-12 Physical Education<\/a><\/li>\n<\/ul>\n<p>To download Databases Management class 12 Notes Computer Science, sample paper for class 12 Physics, Chemistry, Biology, History, Computer Science, Economics, Computer Science, Computer Science, Home Science, Accountancy, Computer Science and Home Science; do check myCBSEguide app or website. myCBSEguide provides sample papers with solution, test papers for chapter-wise practice, NCERT solutions, NCERT Exemplar solutions, quick revision notes for ready reference, CBSE guess papers and CBSE important question papers. Sample Paper all are made available through\u00a0<a href=\"https:\/\/play.google.com\/store\/apps\/details?id=in.techchefs.MyCBSEGuide&amp;referrer=utm_source%3Dmycbse_bottom%26utm_medium%3Dtext%26utm_campaign%3Dmycbseads\"><strong>the best app for CBSE students<\/strong><\/a>\u00a0and myCBSEguide website.<\/p>\n<ul>\n<li class=\"entry-title\"><a href=\"https:\/\/mycbseguide.com\/blog\/pythan-advanced-programming-class-12-notes-computer-science\/\">Pythan Advanced Programming class 12 Notes Computer Science<\/a><\/li>\n<li class=\"entry-title\"><a href=\"https:\/\/mycbseguide.com\/blog\/databases-management-class-12-notes-computer-science\/\">Databases Management class 12 Notes Computer Science<\/a><\/li>\n<li class=\"entry-title\"><a href=\"https:\/\/mycbseguide.com\/blog\/introduction-boolean-algebra-class-12-notes-computer-science\/\">Introduction to Boolean Algebra class 12 Notes Computer Science<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>CBSE class 12 Computer Science Databases Management class 12 Notes Computer Science in PDF are available for free download in myCBSEguide mobile app. The best app for CBSE students now provides Databases Management class 12 Notes Computer Science latest chapter wise notes for quick preparation of CBSE board exams and school based annual examinations. Class &#8230; <a title=\"Databases Management class 12 Notes Computer Science\" class=\"read-more\" href=\"https:\/\/mycbseguide.com\/blog\/databases-management-class-12-notes-computer-science\/\" aria-label=\"More on Databases Management class 12 Notes Computer Science\">Read more<\/a><\/p>\n","protected":false},"author":2,"featured_media":10297,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[48,456],"tags":[457,150,905,908,426,240],"class_list":["post-10300","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cbse-class-12","category-revision-notes","tag-cbse-notes","tag-cbse-notes-and-key-points","tag-computer-science-notes","tag-databases-management","tag-quick-revision","tag-quick-revision-notes"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Databases Management class 12 Notes Computer Science | myCBSEguide<\/title>\n<meta name=\"description\" content=\"Databases Management class 12 Notes Computer Science chp-3 in PDF format for free download. 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