{"id":32,"date":"2023-04-28T23:18:23","date_gmt":"2023-04-28T23:18:23","guid":{"rendered":"http:\/\/77interactive.com\/?p=32"},"modified":"2023-05-10T22:06:43","modified_gmt":"2023-05-10T22:06:43","slug":"aggregation","status":"publish","type":"post","link":"http:\/\/77interactive.com\/?p=32","title":{"rendered":"Aggregation"},"content":{"rendered":"\n<pre class=\"wp-block-code\"><code>db.users.aggregate(&#91;\n  { $group: { _id: \"$name\", age: { $push: \"$age\" } } },\n  { $project: { _id: 0, name: \"$_id\", age: 1, matching: { $cond: &#91; { $eq: &#91;{ $size: \"$age\" }, 1] }, 0, { $cond: &#91; { $eq: &#91; { $min: \"$age\" }, { $max: \"$age\" } ] }, 1, 0 ] } ] } } }\n])\n<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">Aggregation 2<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>db.collection1.aggregate(&#91;\n  {\n    $lookup: {\n      from: \"collection2\",\n      localField: \"database_name\",\n      foreignField: \"database_name\",\n      as: \"matches\"\n    }\n  },\n  {\n    $unwind: \"$matches\"\n  },\n  {\n    $match: {\n      $expr: {\n        $and: &#91;\n          { $eq: &#91; \"$collection_name\", \"$matches.collection_name\" ] },\n          { $eq: &#91; \"$database_name\", \"$matches.database_name\" ] }\n        ]\n      }\n    }\n  },\n  {\n    $project: {\n      _id: 0,\n      database_name: 1,\n      replica_set_name: 1,\n      count_count: 1\n    }\n  }\n])\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>Aggregation 2<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11],"tags":[5,4],"class_list":["post-32","post","type-post","status-publish","format-standard","hentry","category-mongodb","tag-mongodb","tag-pymongo"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.9 - 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