{"id":2841,"date":"2017-02-27T07:19:19","date_gmt":"2017-02-27T15:19:19","guid":{"rendered":"https:\/\/www.couchbase.com\/blog\/?p=2841"},"modified":"2020-02-16T18:00:29","modified_gmt":"2020-02-17T02:00:29","slug":"joining-nosql-documents-mongodb-query-language-vs-couchbase-n1ql","status":"publish","type":"post","link":"https:\/\/www.couchbase.com\/blog\/ko\/joining-nosql-documents-mongodb-query-language-vs-couchbase-n1ql\/","title":{"rendered":"NoSQL \ub370\uc774\ud130 \uc870\uc778: MongoDB \ucffc\ub9ac \uc5b8\uc5b4 \ub300 Couchbase N1QL"},"content":{"rendered":"

NoSQL\uacfc \uad00\ub828\ud558\uc5ec \uac00\uc7a5 \uc790\uc8fc \ubc1b\ub294 \uc9c8\ubb38 \uc911 \ud558\ub098\ub294 \uc5ec\ub7ec \ubb38\uc11c\uc758 \ub370\uc774\ud130\ub97c \ub2e8\uc77c \ucffc\ub9ac \uacb0\uacfc\ub85c \uc870\uc778\ud558\ub294 \ubb38\uc81c\uc785\ub2c8\ub2e4. \uc774 \uc9c8\ubb38\uc740 RDBMS \uac1c\ubc1c\uc790\ub4e4\ub85c\ubd80\ud130 \ub354 \uc790\uc8fc \uc81c\uae30\ub418\uc9c0\ub9cc, \uc800\ub294 NoSQL \uac1c\ubc1c\uc790\ub4e4\ub85c\ubd80\ud130\ub3c4 \uc774 \uc9c8\ubb38\uc744 \ubc1b\uc2b5\ub2c8\ub2e4.<\/p>\n

\ub370\uc774\ud130 \uc870\uc778\uc740 \ub370\uc774\ud130\ubca0\uc774\uc2a4\ub9c8\ub2e4 \ub2e4\ub974\uac8c \uc218\ud589\ub418\uba70, \uadf8 \uc911 \uc77c\ubd80\ub294 \ub370\uc774\ud130\ubca0\uc774\uc2a4 \uacc4\uce35\uc774 \uc544\ub2cc \uc560\ud50c\ub9ac\ucf00\uc774\uc158 \uacc4\uce35\uc744 \ud1b5\ud574 \uc218\ud589\ud574\uc57c \ud569\ub2c8\ub2e4. \ub370\uc774\ud130\ubca0\uc774\uc2a4 \uae30\uc220 \uac04\uc758 \uba87 \uac00\uc9c0 \ub370\uc774\ud130 \uc870\uc778 \uc635\uc158\uc744 \uc0b4\ud3b4\ubcf4\uaca0\uc2b5\ub2c8\ub2e4.<\/p>\n

<\/p>\n

\uc774 \ube14\ub85c\uadf8\uc5d0\uc11c\ub294 MongoDB $lookup \uc5f0\uc0b0\uc790\ub97c \uc0ac\uc6a9\ud558\uc5ec NoSQL \ubb38\uc11c\ub97c \uc870\uc778\ud558\ub294 \ud504\ub85c\uc138\uc2a4\ub97c \ub2e4\uc74c\uacfc \ube44\uad50\ud574\ubcf4\uaca0\uc2b5\ub2c8\ub2e4. \uce74\uc6b0\uce58\ubca0\uc774\uc2a4<\/a>\uc758 \ubcf4\ub2e4 \uc9c1\uad00\uc801\uc778 N1QL \ucffc\ub9ac \uc5b8\uc5b4\uc785\ub2c8\ub2e4.<\/p>\n

\uc0d8\ud50c \ub370\uc774\ud130<\/h2>\n

\uc774 \uc608\uc81c\uc5d0\uc11c\ub294 \ub450 \uac1c\uc758 \uc0d8\ud50c \ubb38\uc11c\ub97c \uae30\ubc18\uc73c\ub85c MongoDB\uc640 Couchbase\ub97c \ubaa8\ub450 \uc0ac\uc6a9\ud558\uaca0\uc2b5\ub2c8\ub2e4. \uc77c\ubc18\uc801\uc778 \uc8fc\ubb38 \ubc0f \uc7ac\uace0 \uc608\uc81c\ub85c \uc791\uc5c5\ud55c\ub2e4\uace0 \uac00\uc815\ud574 \ubcf4\uaca0\uc2b5\ub2c8\ub2e4. \uc778\ubca4\ud1a0\ub9ac\uc758 \uacbd\uc6b0 \ubb38\uc11c\ub294 \ub2e4\uc74c\uacfc \uac19\uc774 \ubcf4\uc77c \uc218 \uc788\uc2b5\ub2c8\ub2e4:<\/p>\n

{\r\n    \"id\": \"product-1\",\r\n    \"type\": \"product\",\r\n    \"name\": \"Pokemon Red\",\r\n    \"price\": 29.99\r\n}<\/pre>\n
\uc704 \ubb38\uc11c\ub294 \ud3c9\uba74\uc801\uc774\uc9c0\ub9cc \ud2b9\uc815 \uc81c\ud488\uc744 \uc81c\ub300\ub85c \uc124\uba85\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uc5ec\uae30\uc5d0\ub294 \uc870\uc778 \ud504\ub85c\uc138\uc2a4 \uc911\uc5d0 \uad00\ub828\ub418\ub294 \uace0\uc720 ID\uac00 \uc788\uc2b5\ub2c8\ub2e4. \uc8fc\ubb38\uc758 \uacbd\uc6b0 \ub2e4\uc74c\uacfc \uac19\uc740 \ubb38\uc11c\uac00 \uc788\uc744 \uc218 \uc788\uc2b5\ub2c8\ub2e4:<\/p>\n
{\r\n    \"id\": \"order-1\",\r\n    \"type\": \"order\",\r\n    \"products\": [\r\n        {\r\n            \"product_id\": \"product-1\",\r\n            \"quantity\": 2\r\n        }\r\n    ]\r\n}<\/pre>\n
\uc5ec\uae30\uc11c\ub294 MongoDB\uc640 Couchbase\ub97c \ubaa8\ub450 \uc0ac\uc6a9\ud558\uc5ec \uc774 \ub450 \ubb38\uc11c\ub97c \ub2e8\uc77c \ucffc\ub9ac\ub85c \uc870\uc778\ud558\ub294 \uac83\uc774 \ubaa9\ud45c\uc785\ub2c8\ub2e4. \uadf8\ub7ec\ub098 \ucffc\ub9ac \uc5b8\uc5b4\uc640\ub294 \ubcc4\uac1c\ub85c, \uc774\ub7ec\ud55c \ubb38\uc11c\ub294 \uc560\ud50c\ub9ac\ucf00\uc774\uc158 \uacc4\uce35\uc744 \ud1b5\ud574 \uc5b8\uc81c\ub4e0\uc9c0 \uc5ec\ub7ec \ucffc\ub9ac\ub97c \ud1b5\ud574 \uc870\uc778\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \ud558\uc9c0\ub9cc \uc774\uac83\uc774 \uc6b0\ub9ac\uac00 \uc6d0\ud558\ub294 \uacb0\uacfc\ub294 \uc544\ub2d9\ub2c8\ub2e4.<\/p>\n
MongoDB\uc640 $lookup \uc5f0\uc0b0\uc790\ub85c \ubb38\uc11c \uc870\uc778\ud558\uae30<\/h3>\n
\ucd5c\uc2e0 \ubc84\uc804\uc758 MongoDB\uc5d0\uc11c \uc870\uc778 \ucffc\ub9ac\uc5d0\ub294 $\uc870\ud68c<\/code> \uc5f0\uc0b0\uc790\ub97c \uc0ac\uc6a9\ud558\uc5ec \uc9d1\uacc4 \ucffc\ub9ac\uc758 \uc77c\ubd80\ub85c \uc0ac\uc6a9\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \ubabd\uace0DB \ubb38\uc11c<\/a>\ub85c \uc124\uc815\ud558\uba74 \uc774 \uc5f0\uc0b0\uc790\ub294 \ub2e4\uc74c\uacfc \uac19\uc774 \uc218\ud589\ub429\ub2c8\ub2e4:<\/p>\n
\ub3d9\uc77c\ud55c \ub370\uc774\ud130\ubca0\uc774\uc2a4\uc5d0\uc11c \uc0e4\ub529\ub418\uc9c0 \uc54a\uc740 \uceec\ub809\uc158\uc5d0 \uc67c\ucabd \uc678\ubd80 \uc870\uc778\uc744 \uc218\ud589\ud558\uc5ec \"\uc870\uc778\ub41c\" \uceec\ub809\uc158\uc758 \ubb38\uc11c\ub97c \ud544\ud130\ub9c1\ud558\uc5ec \ucc98\ub9ac\ud569\ub2c8\ub2e4. $lookup \ub2e8\uacc4\uc5d0\uc11c\ub294 \uc785\ub825 \ubb38\uc11c\uc758 \ud544\ub4dc\uc640 \"\uc870\uc778\ub41c\" \uceec\ub809\uc158\uc758 \ubb38\uc11c \ud544\ub4dc \uac04\uc5d0 \ub3d9\uc77c\uc131 \uc77c\uce58\ub97c \uc218\ud589\ud569\ub2c8\ub2e4.<\/p><\/blockquote>\n
\uc0ac\uc6a9\ud558\ub824\uba74 $\uc870\ud68c<\/code> \uc5f0\uc0b0\uc790\ub97c \uc0ac\uc6a9\ud558\uba74 \ub2e4\uc74c\uacfc \uac19\uc740 \uacb0\uacfc\uac00 \ub098\ud0c0\ub0a9\ub2c8\ub2e4:<\/p>\n
db.collection.aggregate([\r\n    {\r\n       $lookup:\r\n         {\r\n           from: <collection to join>,\r\n           localField: <field from the input documents>,\r\n           foreignField: <field from the documents of the \"from\" collection>,\r\n           as: <output array field>\r\n         }\r\n    }\r\n])<\/pre>\n
\uc774\uc81c \uc774\uac83\uc740 \ud6cc\ub96d\ud558\uc9c0\ub9cc \ubc30\uc5f4\uc5d0\uc11c \ubc1c\uacac\ub418\ub294 \uad00\uacc4\uc5d0\uc11c\ub294 \uc791\ub3d9\ud558\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4. \uc989, \ubc30\uc5f4\uc758 $\uc870\ud68c<\/code> \uc791\uc5c5\uc5d0 \ucc38\uc5ec\ud560 \uc218 \uc5c6\uc2b5\ub2c8\ub2e4. product_id<\/code> \uc5d0\uc11c \ucc3e\uc744 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uc81c\ud488<\/code> \ubc30\uc5f4\uc744 \ub2e4\ub978 \ubb38\uc11c\uc5d0 \ucd94\uac00\ud560 \uc218 \uc5c6\uc2b5\ub2c8\ub2e4. \ub300\uc2e0 \ubc30\uc5f4\uc744 \uba3c\uc800 '\uc5b8\uc640\uc778\ub4dc' \ub610\ub294 '\uc5b8\ub124\uc2a4\ud2b8'\ud574\uc57c \ud558\ubbc0\ub85c \ucffc\ub9ac\uac00 \ub354\uc6b1 \ubcf5\uc7a1\ud574\uc9d1\ub2c8\ub2e4:<\/p>\n
db.orders.aggregate([\r\n    { $unwind: \"$products\" },\r\n    {\r\n        $lookup: {\r\n            from: \"products\",\r\n            localField: \"products.product_id\",\r\n            foreignField: \"_id\",\r\n            as: \"productObjects\"\r\n        }\r\n    }\r\n])<\/pre>\n
\uadf8\ub9ac\uace0 $unwind<\/code> \uc5f0\uc0b0\uc790\ub294 \ubc30\uc5f4\uc744 \ud3c9\ud3c9\ud558\uac8c \ud55c \ub2e4\uc74c \uc0dd\uc131\ub41c \uc774\uc81c \ud3c9\ud3c9\ud574\uc9c4 \uac1c\uccb4\uc5d0 \ub300\ud574 \uc870\uc778\uc744 \uc218\ud589\ud569\ub2c8\ub2e4. \uc774\ub7ec\ud55c \ucffc\ub9ac\uc758 \uacb0\uacfc\ub294 \ub2e4\uc74c\uacfc \uac19\uc2b5\ub2c8\ub2e4:<\/p>\n
{\r\n    \"_id\" : ObjectId(\"58a3869acbf64c4ace55e713\"),\r\n    \"products\" : {\r\n        \"product_id\" : ObjectId(\"58a3851b2f14a900caa7a731\"),\r\n        \"quantity\" : 2\r\n    },\r\n    \"productObjects\" : [\r\n        {\r\n            \"_id\" : ObjectId(\"58a3851b2f14a900caa7a731\"),\r\n            \"name\" : \"Pokemon Red\",\r\n            \"price\" : 29.99\r\n        }\r\n    ]\r\n}<\/pre>\n
\ubc30\uc5f4\uc5d0 \ucc38\uc870\uac00 \ub450 \uac1c \uc774\uc0c1 \uc788\uc5c8\ub2e4\uba74 \ub354 \ub9ce\uc740 \uacb0\uacfc\uac00 \ubc18\ud658\ub418\uc5c8\uc744 \uac83\uc785\ub2c8\ub2e4. \uadf8\ub7ec\ub098 \ubc18\ud658\ub418\ub294 \uacb0\uacfc\ub294 \uadf8\ub2e4\uc9c0 \ub9e4\ub825\uc801\uc774\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4. \uc5ec\uc804\ud788 \uc774\uc804 \uc81c\ud488<\/code> \uac1d\uccb4\uc5d0\uc11c \uc774\uc81c \uc81c\ud488 \uac1c\uccb4<\/code> \ubc30\uc5f4\uc744 \ucd94\uac00\ud569\ub2c8\ub2e4. \ub370\uc774\ud130 \uc2a4\ud2b8\ub9bc\uc5d0 \ub300\ud55c \ucd94\uac00 \uc870\uc791\uc774 \ud544\uc694\ud569\ub2c8\ub2e4.<\/p>\n
\uadf8\ub9ac\uace0 \uc81c\ud488 \uac1c\uccb4<\/code> \ubc30\uc5f4\uc744 \"\uc5b8\uc640\uc778\ub4dc\"\ud55c \ub2e4\uc74c \uc6d0\ud558\ub294 \ubc29\uc2dd\uc73c\ub85c \uc7ac\uad6c\uc131\ud574\uc57c \ud569\ub2c8\ub2e4. \uc774\ub97c \uc704\ud574\uc11c\ub294 \ub2e4\uc74c\uc744 \uc218\ud589\ud558\uba74 \ub429\ub2c8\ub2e4:<\/p>\n
db.orders.aggregate([\r\n    { $unwind: \"$products\" },\r\n    {\r\n        $lookup: {\r\n            from: \"products\",\r\n            localField: \"products.product_id\",\r\n            foreignField: \"_id\",\r\n            as: \"productObjects\"\r\n        }\r\n    },\r\n    { $unwind: \"$productObjects\"},\r\n    {\r\n        $project: {\r\n            products: {\r\n                \"quantity\": \"$products.quantity\",\r\n                \"name\": \"$productObjects.name\",\r\n                \"price\": \"$productObjects.price\"\r\n            }\r\n        }\r\n    }\r\n])<\/pre>\n
\ucc38\uace0 \uc9d1\uacc4<\/code> \ucffc\ub9ac\ub294 \uc774\uc81c \ub354 \ubcf5\uc7a1\ud574\uc9c0\uace0 \uc788\uc2b5\ub2c8\ub2e4. \uc870\uc778\uc744 \uc218\ud589\ud55c \ud6c4 \uacb0\uacfc\ub97c \"\uc5b8\uc640\uc778\ub4dc\"\ud55c \ub2e4\uc74c \ub2e4\uc74c\uc744 \uc0ac\uc6a9\ud558\uc5ec \uacb0\uacfc\ub97c \uc7ac\uad6c\uc131\ud569\ub2c8\ub2e4. $\ud504\ub85c\uc81d\ud2b8<\/code> \uc5f0\uc0b0\uc790\uc785\ub2c8\ub2e4.<\/p>\n
\uc774 \uc2dc\uc810\uc5d0\uc11c \uacb0\uacfc\ub97c \uadf8\ub8f9\ud654\ud558\ub294 \ub4f1 \uacb0\uacfc\uc5d0 \ub300\ud55c \ucd94\uac00 \uc870\uc791\uc744 \uc218\ud589\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uc81c\ud488<\/code> \uac1d\uccb4\uac00 \ub2e4\uc2dc \ub2e8\uc77c \ubc30\uc5f4\uc774 \ub429\ub2c8\ub2e4. \ub370\uc774\ud130 \uc9d1\ud569\uc744 \uc870\uc791\ud560 \ub54c\ub9c8\ub2e4 \ub354 \ub9ce\uc740 \uc9d1\uacc4 \ucf54\ub4dc\uac00 \ud544\uc694\ud558\ubbc0\ub85c \uc27d\uac8c \uc9c0\uc800\ubd84\ud558\uace0 \ubcf5\uc7a1\ud574\uc9c0\uba70 \uc77d\uae30 \uc5b4\ub824\uc6cc\uc9c8 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n
\uc774 \ubd80\ubd84\uc5d0\uc11c Couchbase N1QL\uc744 \uc0ac\uc6a9\ud558\uba74 \ud6e8\uc52c \ub354 \uc990\uac81\uac8c \uc791\uc5c5\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n
\uce74\uc6b0\uce58\ubca0\uc774\uc2a4\uc640 N1QL\uc744 \uc0ac\uc6a9\ud558\uc5ec NoSQL \ubb38\uc11c \uc870\uc778\ud558\uae30<\/h3>\n
MongoDB\uc5d0 \uc0ac\uc6a9\ud55c \uac83\uacfc \ub3d9\uc77c\ud55c \ubb38\uc11c \uc608\uc81c\ub97c \uc0ac\uc6a9\ud558\uaca0\uc2b5\ub2c8\ub2e4. \uc774\ubc88\uc5d0\ub294 \uc791\uc5c5\uc744 \uc644\ub8cc\ud558\uae30 \uc704\ud574 N1QL\ub85c SQL \ucffc\ub9ac\ub97c \uc791\uc131\ud574 \ubcf4\uaca0\uc2b5\ub2c8\ub2e4.<\/p>\n
\uac00\uc7a5 \uba3c\uc800 \ub5a0\uc624\ub974\ub294 \uac83\uc740 \uc544\ub9c8\ub3c4 JOIN<\/code> \ub97c \uc785\ub825\ud569\ub2c8\ub2e4. \ucffc\ub9ac\ub294 \ub2e4\uc74c\uacfc \uac19\uc774 \ubcf4\uc77c \uc218 \uc788\uc2b5\ub2c8\ub2e4:<\/p>\n
SELECT orders.*, product\r\nFROM example AS orders\r\nJOIN example AS product ON KEYS orders.products[*].product_id\r\nWHERE orders.type = 'order'<\/pre>\n
\uc704\uc758 \uc608\uc5d0\uc11c\ub294 \ub450 \ubb38\uc11c\uac00 \ubaa8\ub450 \ub3d9\uc77c\ud55c Couchbase \ubc84\ud0b7\uc5d0 \uc874\uc7ac\ud569\ub2c8\ub2e4. A JOIN<\/code> \ubb38\uc11c ID\uc5d0 \ub300\ud55c product_id<\/code> \uac12\uc5d0 \uc788\ub294 \uc81c\ud488<\/code> \ubc30\uc5f4\uc744 \uc0ac\uc6a9\ud569\ub2c8\ub2e4. \uc704\uc758 \ucffc\ub9ac\ub294 \ub2e4\uc74c\uacfc \uac19\uc740 \uacb0\uacfc\ub97c \ubc18\ud658\ud569\ub2c8\ub2e4:<\/p>\n
[\r\n  {\r\n    \"id\": \"order-1\",\r\n    \"product\": {\r\n      \"id\": \"product-1\",\r\n      \"name\": \"Pokemon Red\",\r\n      \"price\": 29.99,\r\n      \"type\": \"product\"\r\n    },\r\n    \"products\": [\r\n      {\r\n        \"product_id\": \"product-1\",\r\n        \"quantity\": 2\r\n      }\r\n    ],\r\n    \"type\": \"order\"\r\n  }\r\n]<\/pre>\n
\ubabd\uace0DB\uc640 \ub9c8\ucc2c\uac00\uc9c0\ub85c, \ubaa8\ub4e0 \ud56d\ubaa9\uc5d0 \ub300\ud55c \uacb0\uacfc\uac00 \uc788\uc2b5\ub2c8\ub2e4. \uc81c\ud488<\/code> \ubc30\uc5f4\uc744 \ucc3e\uc544\uc57c \ud569\ub2c8\ub2e4. \uacf5\uc815\ud558\uac8c \ub9d0\ud558\uc790\uba74, N1QL \ubc84\uc804\uc774 \uc791\uc131\ud558\uae30\ub294 \ub354 \uc26c\uc6e0\uc9c0\ub9cc, \uc774 \uc2dc\uc810\uc5d0\uc11c \ubabd\uace0DB \ucffc\ub9ac \uc5b8\uc5b4\ubcf4\ub2e4 \ubc18\ub4dc\uc2dc \ub354 \uc5b4\ub824\uc6b4 \uac83\uc740 \uc544\ub2c8\uc5c8\uc2b5\ub2c8\ub2e4. \ub370\uc774\ud130\ub97c \ub354 \ub9ce\uc774 \uc870\uc791\ud560\uc218\ub85d Couchbase\ub294 \uadf8\uc5d0 \ube44\ud574 \ud6e8\uc52c \ub354 \uc26c\uc6cc\uc9d1\ub2c8\ub2e4.<\/p>\n
\uc608\ub97c \ub4e4\uc5b4 \uacb0\uacfc\ub97c \uc815\ub9ac\ud558\uace0 \uc2f6\ub2e4\uace0 \uac00\uc815\ud574 \ubcf4\uaca0\uc2b5\ub2c8\ub2e4:<\/p>\n
SELECT orders.id, orders.type, OBJECT_PUT(product, \"quantity\", products.quantity) AS product\r\nFROM example AS orders\r\nUNNEST orders.products AS products\r\nJOIN example AS product ON KEYS products.product_id\r\nWHERE orders.type = 'order'<\/pre>\n
\uc704\uc5d0\uc11c \uc218\ud589\ud558\ub294 \uc791\uc5c5\uc5d0\ub294 \uba87 \uac00\uc9c0 \ud070 \ucc28\uc774\uc810\uc774 \uc788\uc9c0\ub9cc, \uc218\ud589 \ubc29\ubc95\uc5d0\ub294 \uc57d\uac04\uc758 \ucc28\uc774\uac00 \uc788\uc2b5\ub2c8\ub2e4. \ubc30\uc5f4\uc5d0 \uc9c1\uc811 \uc870\uc778\ud558\ub294 \ub300\uc2e0, \uba3c\uc800 MongoDB\uc5d0\uc11c \ubcf8 \uac83\uacfc \uac19\uc774 \ubc30\uc5f4\uc744 \ud3c9\ud3c9\ud558\uac8c \ud558\uac70\ub098 \"\uc911\ucca9 \ud574\uc81c\"\ud569\ub2c8\ub2e4. $unwind<\/code> \uc5f0\uc0b0\uc790\ub97c \uc0ac\uc6a9\ud569\ub2c8\ub2e4. \uc774\uc81c \uac01\uac01\uc758 \ud3c9\ud3c9\ud55c \uacb0\uacfc\uc5d0\uc11c \uc870\uc778\uc774 \uc218\ud589\ub429\ub2c8\ub2e4. \ub9c8\uc9c0\ub9c9\uc73c\ub85c \uc218\ub7c9<\/code> \ub97c \uc0c8 \uac1c\uccb4\uc5d0 \ucd94\uac00\ud569\ub2c8\ub2e4.<\/p>\n
\uc704 \ucffc\ub9ac\uc5d0 \ub300\ud55c \uacb0\uacfc\ub294 \ub2e4\uc74c\uacfc \uac19\uc2b5\ub2c8\ub2e4:<\/p>\n
[\r\n  {\r\n    \"id\": \"order-1\",\r\n    \"product\": {\r\n      \"id\": \"product-1\",\r\n      \"name\": \"Pokemon Red\",\r\n      \"price\": 29.99,\r\n      \"quantity\": 2,\r\n      \"type\": \"product\"\r\n    },\r\n    \"type\": \"order\"\r\n  }\r\n]<\/pre>\n
\uc6d0\ubcf8 \uc81c\ud488<\/code> \ubc30\uc5f4\uc5d0 \ub458 \uc774\uc0c1\uc758 \uc81c\ud488 \ucc38\uc870\uac00 \ud3ec\ud568\ub418\uc5b4 \uc788\uc2b5\ub2c8\ub2e4. \ubc30\uc5f4\uc5d0 \ub530\ub77c \uc5ec\ub7ec \uac1c\uc758 \uac1d\uccb4\ub97c \ubc18\ud658\ud558\ub294 \ub300\uc2e0 JOIN<\/code> \uae30\uc900\uc5d0 \ub530\ub77c \uc6d0\ub798 \ubc30\uc5f4\uc744 \ub2e4\uc2dc \ud328\ud0b9\ud558\ub294 \uac83\uc774 \ud569\ub9ac\uc801\uc77c \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n
SELECT orders.id, orders.type, ARRAY_AGG(OBJECT_PUT(product, \"quantity\", products.quantity)) AS products\r\nFROM example AS orders\r\nUNNEST orders.products AS products\r\nJOIN example AS product ON KEYS products.product_id\r\nWHERE orders.type = 'order'\r\nGROUP BY orders<\/pre>\n
\uc704\uc758 \ucffc\ub9ac\uc5d0\uc11c\ub294 \ub2e4\uc74c\uacfc \uac19\uc740 \ud56d\ubaa9\ub9cc \ucd94\uac00\ud588\uc2b5\ub2c8\ub2e4. ARRAY_AGG<\/code> \ubc0f \uadf8\ub8f9 \uae30\uc900<\/code>\ub85c \ud45c\uc2dc\ub418\uc9c0\ub9cc \uacb0\uacfc\uc801\uc73c\ub85c \uac01 \uc870\uc778\ub41c \ubb38\uc11c\ub294 \uc81c\ud488<\/code> \ubc30\uc5f4\uc744 \uc0ac\uc6a9\ud569\ub2c8\ub2e4.<\/p>\n
\uc2e4\uc81c JOIN<\/code> \uc5f0\uc0b0\uc790\ub97c \uc0ac\uc6a9\ud558\uc2dc\ub098\uc694? \ub300\uc2e0 SQL \ud558\uc704 \ucffc\ub9ac\ub97c \uc0ac\uc6a9\ud574 \ubcf4\uc138\uc694.<\/p>\n
\uacb0\ub860<\/h2>\n
NoSQL\uc5d0\uc11c \ub370\uc774\ud130 \uc870\uc778\uc740 \uc219\ub828\ub41c RDBMS \ubca0\ud14c\ub791 \uac1c\ubc1c\uc790\ub4e4\uc5d0\uac8c \ub9e4\uc6b0 \uc778\uae30 \uc788\ub294 \uad00\uc2ec\uc0ac\uc785\ub2c8\ub2e4. MongoDB\ub294 \ub9e4\uc6b0 \uc778\uae30 \uc788\ub294 NoSQL \uae30\uc220\uc774\uae30 \ub54c\ubb38\uc5d0 Couchbase\uac00 \ubb38\uc11c \uc870\uc778\uc744 \ucc98\ub9ac\ud558\ub294 \ubc29\uc2dd\uacfc \ube44\uad50\ud558\ub294 \ub370 \uc0ac\uc6a9\ud558\uba74 \uc88b\uaca0\ub2e4\uace0 \uc0dd\uac01\ud588\uc2b5\ub2c8\ub2e4. \uac00\ubcbc\uc6b4 \uc791\uc5c5\uc6a9, $\uc870\ud68c<\/code> \uc5f0\uc0b0\uc790\ub294 \uacac\ub51c \uc218 \uc788\uc9c0\ub9cc, MongoDB\uc758 \uc870\uc778 \ucffc\ub9ac\uac00 \ub354 \ubcf5\uc7a1\ud574\uc9c0\uba74 \ud55c \uac78\uc74c \ubb3c\ub7ec\uc11c\uc57c \ud560 \uc218\ub3c4 \uc788\uc2b5\ub2c8\ub2e4. N1QL\uc744 \uc0ac\uc6a9\ud558\uba74 \uc870\uc778 \uc5f0\uc0b0\uc774 \ud3ec\ud568\ub41c \ubcf5\uc7a1\ud55c \ucffc\ub9ac\ub97c \ub9e4\uc6b0 \uc27d\uac8c \uc791\uc131\ud560 \uc218 \uc788\uc73c\uba70 \ucffc\ub9ac\uac00 \uc5bc\ub9c8\ub098 \ubcf5\uc7a1\ud55c\uc9c0\uc5d0 \uad00\uacc4\uc5c6\uc774 \uc27d\uac8c \uc720\uc9c0\ub429\ub2c8\ub2e4.<\/p>\n
N1QL \ubc0f Couchbase\uc5d0 \ub300\ud55c \uc790\uc138\ud55c \ub0b4\uc6a9\uc740 \ub2e4\uc74c\uc744 \ucc38\uc870\ud558\uc138\uc694. \uce74\uc6b0\uce58\ubca0\uc774\uc2a4 \uac1c\ubc1c\uc790 \ud3ec\ud138<\/a>.<\/p>","protected":false},"excerpt":{"rendered":"
One of the most frequent questions I receive when it comes to NoSQL is on the subject of joining data from multiple documents into a single query result. While this question is brought up more frequently from RDBMS developers, I […]<\/p>","protected":false},"author":63,"featured_media":2787,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[1815,1816,1812],"tags":[1309,1861],"ppma_author":[9032],"class_list":["post-2841","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-best-practices-and-tutorials","category-couchbase-server","category-n1ql-query","tag-mongodb","tag-unnest"],"acf":[],"yoast_head":"\nJoining NoSQL Data: MongoDB Query Language vs Couchbase N1QL<\/title>\n<meta name=\"description\" content=\"Learn the secrets of joining NoSQL documents in this tutorial featuring the MongoDB Query Language and Couchbase's intuitive N1QL query language.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.couchbase.com\/blog\/ko\/joining-nosql-documents-mongodb-query-language-vs-couchbase-n1ql\/\" \/>\n<meta property=\"og:locale\" content=\"ko_KR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Joining NoSQL Data: MongoDB Query Language vs Couchbase N1QL\" \/>\n<meta property=\"og:description\" content=\"Learn the secrets of joining NoSQL documents in this tutorial featuring the MongoDB Query Language and Couchbase's intuitive N1QL query language.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.couchbase.com\/blog\/ko\/joining-nosql-documents-mongodb-query-language-vs-couchbase-n1ql\/\" \/>\n<meta property=\"og:site_name\" content=\"The Couchbase Blog\" \/>\n<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/thepolyglotdeveloper\" \/>\n<meta property=\"article:published_time\" content=\"2017-02-27T15:19:19+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2020-02-17T02:00:29+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.couchbase.com\/blog\/wp-content\/uploads\/2017\/02\/mongo-to-couchbase.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1100\" \/>\n\t<meta property=\"og:image:height\" content=\"389\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Nic Raboy, Developer Advocate, Couchbase\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@nraboy\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Nic Raboy, Developer Advocate, Couchbase\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"6\ubd84\" \/>\n<script type=\"application\/ld+json\" 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