{"id":1568,"date":"2021-05-23T12:30:00","date_gmt":"2021-05-23T07:00:00","guid":{"rendered":"https:\/\/www.codingbroz.com\/?p=1568"},"modified":"2021-06-20T21:38:36","modified_gmt":"2021-06-20T16:08:36","slug":"ollivanders-inventory-sql-solution","status":"publish","type":"post","link":"https:\/\/www.codingbroz.com\/ollivanders-inventory-sql-solution\/","title":{"rendered":"Ollivander&#8217;s Inventory in SQL | HackerRank Solution"},"content":{"rendered":"\n<p>Hello coders, today we are going to solve <strong>Ollivander&#8217;s Inventory HackerRank Solution in SQL<\/strong>.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1200\" height=\"676\" src=\"https:\/\/www.codingbroz.com\/wp-content\/uploads\/2021\/05\/ollivander-inventory-sql-solution-codingbroz.png\" alt=\"Ollivander's Inventory\" class=\"wp-image-1570\" srcset=\"https:\/\/www.codingbroz.com\/wp-content\/uploads\/2021\/05\/ollivander-inventory-sql-solution-codingbroz.png 1200w, https:\/\/www.codingbroz.com\/wp-content\/uploads\/2021\/05\/ollivander-inventory-sql-solution-codingbroz-768x433.png 768w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_65 ez-toc-wrap-left counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<label for=\"ez-toc-cssicon-toggle-item-66366287a5ddc\" class=\"ez-toc-cssicon-toggle-label\"><label class=\"ez-toc-title\">Table of Contents<\/label>\n<span class=\"ez-toc-cssicon\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #0090ff;color:#0090ff\" 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: #0090ff;color:#0090ff\" 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><\/label><input type=\"checkbox\"  id=\"ez-toc-cssicon-toggle-item-66366287a5ddc\" checked \/><nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.codingbroz.com\/ollivanders-inventory-sql-solution\/#Problem\" title=\"Problem\">Problem<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.codingbroz.com\/ollivanders-inventory-sql-solution\/#Input_Format\" title=\"Input Format\">Input Format<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.codingbroz.com\/ollivanders-inventory-sql-solution\/#Explanation\" title=\"Explanation\">Explanation<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.codingbroz.com\/ollivanders-inventory-sql-solution\/#Solution_%E2%80%93_Ollivanders_Inventory_in_SQL\" title=\"Solution &#8211; Ollivander&#8217;s Inventory in SQL\">Solution &#8211; Ollivander&#8217;s Inventory in SQL<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.codingbroz.com\/ollivanders-inventory-sql-solution\/#MySQL\" title=\"MySQL\">MySQL<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Problem\"><\/span><strong>Problem<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Harry Potter and his friends are at Ollivander&#8217;s with Ron, finally replacing Charlie&#8217;s old broken wand.<\/p>\n\n\n\n<p>Hermione decides the best way to choose is by determining the minimum number of gold galleons needed to buy each&nbsp;<em>non-evil<\/em>&nbsp;wand of high power and age. Write a query to print the&nbsp;<em>id<\/em>,&nbsp;<em>age<\/em>,&nbsp;<em>coins_needed<\/em>, and&nbsp;<em>power<\/em>&nbsp;of the wands that Ron&#8217;s interested in, sorted in order of descending&nbsp;<em>power<\/em>. If more than one wand has same power, sort the result in order of descending&nbsp;<em>age<\/em>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Input_Format\"><\/span><strong>Input Format<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>The following tables contain data on the wands in Ollivander&#8217;s inventory:<\/p>\n\n\n\n<ul><li><em>Wands:<\/em>&nbsp;The&nbsp;<em>id<\/em>&nbsp;is the id of the wand,&nbsp;<em>code<\/em>&nbsp;is the code of the wand,&nbsp;<em>coins_needed<\/em>&nbsp;is the total number of gold galleons needed to buy the wand, and&nbsp;<em>power<\/em>&nbsp;denotes the quality of the wand (the higher the power, the better the wand is).<\/li><li><em>Wands_Property:<\/em>&nbsp;The&nbsp;<em>code<\/em>&nbsp;is the code of the wand,&nbsp;<em>age<\/em>&nbsp;is the age of the wand, and&nbsp;<em>is_evil<\/em>&nbsp;denotes whether the wand is good for the dark arts. If the value of&nbsp;<em>is_evil<\/em>&nbsp;is&nbsp;<em>0<\/em>, it means that the wand is not evil. The mapping between&nbsp;<em>code<\/em>&nbsp;and&nbsp;<em>age<\/em>&nbsp;is one-one, meaning that if there are two pairs,&nbsp;(<em><strong>code1, age1<\/strong><\/em>)&nbsp;and&nbsp;(<em><strong>code2, age2<\/strong><\/em>), then&nbsp;<strong><em>code1 != code2<\/em><\/strong>&nbsp;and<em><strong>&nbsp;age1 != age2<\/strong><\/em>.<\/li><\/ul>\n\n\n\n<p><strong>Sample Input<\/strong><\/p>\n\n\n\n<p>Wands Table<\/p>\n\n\n\n<p><em>Wands_Property<\/em>&nbsp;Table:<\/p>\n\n\n\n<p><strong>Sample Output<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>9 45 1647 10\n12 17 9897 10\n1 20 3688 8\n15 40 6018 7\n19 20 7651 6\n11 40 7587 5\n10 20 504 5\n18 40 3312 3\n20 17 5689 3\n5 45 6020 2\n14 40 5408 1<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Explanation\"><\/span><strong>Explanation<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>The data for wands of&nbsp;<em>age 45<\/em>&nbsp;(code 1):&nbsp;<\/p>\n\n\n\n<ul><li>The minimum number of galleons needed for&nbsp;<strong><em>wand<\/em>(<em>age<\/em> = 45, <em>power<\/em> = 2) = 6020 <\/strong><\/li><li>The minimum number of galleons needed for&nbsp;<strong><em>wand<\/em>(<em>age<\/em> = 45, <em>power<\/em> = 10) = 1647<\/strong><\/li><\/ul>\n\n\n\n<p>The data for wands of&nbsp;<em>age 40<\/em>&nbsp;(code 2):&nbsp;<\/p>\n\n\n\n<ul><li>The minimum number of galleons needed for&nbsp;<strong><em>wand<\/em>(<em>age<\/em> = 40, <em>power<\/em> = 1) = 5408<\/strong><\/li><li>The minimum number of galleons needed for&nbsp;<strong><em>wand<\/em>(<em>age<\/em> = 40, <em>power<\/em> = 3) = 3312<\/strong><\/li><li>The minimum number of galleons needed for&nbsp;<strong><em>wand<\/em>(<em>age<\/em> = 40, <em>power<\/em> = 5) = 7587<\/strong><\/li><li>The minimum number of galleons needed for&nbsp;<strong><em>wand<\/em>(<em>age<\/em> = 40, <em>power<\/em> = 7) = 6018<\/strong><\/li><\/ul>\n\n\n\n<p>The data for wands of&nbsp;<em>age 20<\/em>&nbsp;(code 4):&nbsp;<\/p>\n\n\n\n<ul><li>The minimum number of galleons needed for&nbsp;<strong><em>wand<\/em>(<em>age<\/em> = 20, <em>power<\/em> = 5) = 504<\/strong><\/li><li>The minimum number of galleons needed for&nbsp;<strong><em>wand<\/em>(<em>age<\/em> = 20, <em>power<\/em> = 6) = 7651<\/strong><\/li><li>The minimum number of galleons needed for&nbsp;<strong><em>wand<\/em>(<em>age<\/em> = 20, <em>power<\/em> = 8) = 3688<\/strong><\/li><\/ul>\n\n\n\n<p>The data for wands of&nbsp;<em>age 17<\/em>&nbsp;(code 5):&nbsp;<\/p>\n\n\n\n<ul><li>The minimum number of galleons needed for&nbsp;<strong><em>wand<\/em>(<em>age<\/em> = 17, <em>power<\/em> = 3) = 5689<\/strong><\/li><li>The minimum number of galleons needed for&nbsp;<strong><em>wand<\/em>(<em>age<\/em> = 17, <em>power<\/em> = 10) = 9897<\/strong><\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Solution_%E2%80%93_Ollivanders_Inventory_in_SQL\"><\/span><strong>Solution &#8211; Ollivander&#8217;s Inventory in SQL<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"MySQL\"><\/span><strong>MySQL<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"sql\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">SELECT a.id, \n   b.age, \n   a.coins_needed, \n   a.power \nFROM   wands a \n   JOIN wands_property b \n     ON a.code = b.code \nWHERE  b.is_evil = 0 \n    AND a.coins_needed = (SELECT Min(a1.coins_needed) \n    FROM   wands a1 \n        JOIN wands_property b1 \n          ON a1.code = b1.code \n    WHERE  b.age = b1.age \n        AND a.power = a1.power) \nORDER  BY a.power DESC, \n          b.age DESC;<\/pre>\n\n\n\n<script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js\"><\/script>\n<ins class=\"adsbygoogle\"\n     style=\"display:block; text-align:center;\"\n     data-ad-layout=\"in-article\"\n     data-ad-format=\"fluid\"\n     data-ad-client=\"ca-pub-5246141430412355\"\n     data-ad-slot=\"8798433565\"><\/ins>\n<script>\n     (adsbygoogle = window.adsbygoogle || []).push({});\n<\/script>\n\n\n\n<p><strong>Disclaimer:<\/strong> The above Problem <strong>(<a href=\"https:\/\/www.hackerrank.com\/challenges\/harry-potter-and-wands\/problem\" target=\"_blank\" rel=\"noreferrer noopener\" class=\"rank-math-link\">Ollivander&#8217;s Inventory<\/a>) <\/strong>is generated by <strong>Hacker Rank<\/strong> but the Solution is Provided by <strong>CodingBroz<\/strong>. This tutorial is only for <strong>Educational<\/strong> and <strong>Learning <\/strong>Purpose.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Hello coders, today we are going to solve Ollivander&#8217;s Inventory HackerRank Solution in SQL.<\/p>\n","protected":false},"author":1,"featured_media":1570,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"default","ast-site-content-layout":"","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":"","theme-transparent-header-meta":"default","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-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-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-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""}},"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[9,138],"tags":[80,18,139,156],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"https:\/\/www.codingbroz.com\/wp-content\/uploads\/2021\/05\/ollivander-inventory-sql-solution-codingbroz.png","jetpack-related-posts":[],"_links":{"self":[{"href":"https:\/\/www.codingbroz.com\/wp-json\/wp\/v2\/posts\/1568"}],"collection":[{"href":"https:\/\/www.codingbroz.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.codingbroz.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.codingbroz.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.codingbroz.com\/wp-json\/wp\/v2\/comments?post=1568"}],"version-history":[{"count":3,"href":"https:\/\/www.codingbroz.com\/wp-json\/wp\/v2\/posts\/1568\/revisions"}],"predecessor-version":[{"id":3502,"href":"https:\/\/www.codingbroz.com\/wp-json\/wp\/v2\/posts\/1568\/revisions\/3502"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.codingbroz.com\/wp-json\/wp\/v2\/media\/1570"}],"wp:attachment":[{"href":"https:\/\/www.codingbroz.com\/wp-json\/wp\/v2\/media?parent=1568"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.codingbroz.com\/wp-json\/wp\/v2\/categories?post=1568"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.codingbroz.com\/wp-json\/wp\/v2\/tags?post=1568"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}