{"id":17960,"date":"2022-10-28T04:39:41","date_gmt":"2022-10-27T23:09:41","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-mongodb-query-condition-including-sum\/"},"modified":"2022-10-28T04:39:41","modified_gmt":"2022-10-27T23:09:41","slug":"solved-mongodb-query-condition-including-sum","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-mongodb-query-condition-including-sum\/","title":{"rendered":"[Solved] MongoDB query condition including SUM"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-33481196\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"33481196\" data-parentid=\"33480976\" data-score=\"1\" data-position-on-page=\"1\" data-highest-scored=\"1\" data-question-has-accepted-highest-score=\"1\" itemprop=\"acceptedAnswer\" itemscope itemtype=\"https:\/\/schema.org\/Answer\">\n<div class=\"post-layout\">\n<div class=\"votecell post-layout--left\"><\/div>\n<div class=\"answercell post-layout--right\">\n<div class=\"s-prose js-post-body\" itemprop=\"text\">\n<p>The <a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/docs.mongodb.org\/manual\/reference\/operator\/aggregation\/redact\/\"><strong><code>$redact<\/code><\/strong><\/a> operator of the <a rel=\"nofollow noopener\" target=\"_blank\" href=\"http:\/\/docs.mongodb.org\/manual\/reference\/method\/db.collection.aggregate\/\">aggregation framework<\/a> is your best option:<\/p>\n<pre class=\"lang-js prettyprint-override\"><code>db.collection.aggregate([\n    { \"$redact\": {\n        \"$cond\": {\n            \"if\": { \"$lt\": [ { \"$add\": [ \"$b\", \"$c\" ] }, 5 ] },\n            \"then\": \"$$KEEP\",\n            \"else\": \"$$PRUNE\"\n        }\n    }},\n    { \"$project\": { \"_id\": 0, \"a\": 1 } }\n])\n<\/code><\/pre>\n<p>The logical condition is made via <a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/docs.mongodb.org\/manual\/reference\/operator\/aggregation\/lt\/\"><code>$lt<\/code><\/a> on the math expression of <a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/docs.mongodb.org\/manual\/reference\/operator\/aggregation\/add\/\"><code>$add<\/code><\/a> in order to determine which items to keep.<\/p>\n<p>The <a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/docs.mongodb.org\/manual\/reference\/operator\/aggregation\/project\/\"><code>$project<\/code><\/a> selects the fields.<\/p>\n<p>The alternate is <a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/docs.mongodb.org\/manual\/reference\/operator\/query\/where\/\"><code>$where<\/code><\/a> which uses JavaScript evalution. Not as effective due to the JavaScript translation required ( the following is a shell shortcut for <code>$where<\/code> ):<\/p>\n<pre class=\"lang-js prettyprint-override\"><code>db.collection.find(\n  function() {\n    return ( this.b + this.c ) &lt; 5;\n  },\n  { \"_id\": 0, \"a\": 1 }\n);\n<\/code><\/pre>\n<p>Or:<\/p>\n<pre class=\"lang-js prettyprint-override\"><code>db.collection.find(\n    { \"$where\": \"return ( this.b + this.c ) &lt; 5;\" },\n    { \"_id\": 0, \"a\": 1 }\n);\n<\/code><\/pre>\n<p>Which is basically the same thing.<\/p>\n<p>Native operators are more performant than JavaScript evalutation.<\/p>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\"><\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved MongoDB query condition including SUM <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] The $redact operator of the aggregation framework is your best option: db.collection.aggregate([ { &#8220;$redact&#8221;: { &#8220;$cond&#8221;: { &#8220;if&#8221;: { &#8220;$lt&#8221;: [ { &#8220;$add&#8221;: [ &#8220;$b&#8221;, &#8220;$c&#8221; ] }, 5 ] }, &#8220;then&#8221;: &#8220;$$KEEP&#8221;, &#8220;else&#8221;: &#8220;$$PRUNE&#8221; } }}, { &#8220;$project&#8221;: { &#8220;_id&#8221;: 0, &#8220;a&#8221;: 1 } } ]) The logical condition is made via $lt &#8230; <a title=\"[Solved] MongoDB query condition including SUM\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-mongodb-query-condition-including-sum\/\" aria-label=\"More on [Solved] MongoDB query condition including SUM\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[2979,1128,2978],"class_list":["post-17960","post","type-post","status-publish","format-standard","hentry","category-solved","tag-aggregation-framework","tag-mongodb","tag-mongodb-query"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] MongoDB query condition including SUM - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-mongodb-query-condition-including-sum\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] MongoDB query condition including SUM - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] The $redact operator of the aggregation framework is your best option: db.collection.aggregate([ { &quot;$redact&quot;: { &quot;$cond&quot;: { &quot;if&quot;: { &quot;$lt&quot;: [ { &quot;$add&quot;: [ &quot;$b&quot;, &quot;$c&quot; ] }, 5 ] }, &quot;then&quot;: &quot;$$KEEP&quot;, &quot;else&quot;: &quot;$$PRUNE&quot; } }}, { &quot;$project&quot;: { &quot;_id&quot;: 0, &quot;a&quot;: 1 } } ]) The logical condition is made via $lt ... 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