{"id":3955,"date":"2017-08-22T10:00:34","date_gmt":"2017-08-22T17:00:34","guid":{"rendered":"https:\/\/www.couchbase.com\/blog\/?p=3955"},"modified":"2025-06-13T17:32:59","modified_gmt":"2025-06-14T00:32:59","slug":"aggregate-grouping-n1ql-mapreduce","status":"publish","type":"post","link":"https:\/\/www.couchbase.com\/blog\/ko\/aggregate-grouping-n1ql-mapreduce\/","title":{"rendered":"N1QL\/MapReduce\ub97c \uc0ac\uc6a9\ud55c \uc9d1\uacc4 \uadf8\ub8f9\ud654"},"content":{"rendered":"
\n

\uc774 \ube14\ub85c\uadf8 \uac8c\uc2dc\ubb3c\uc758 \uc81c\ubaa9\uc744 \uc9d1\uacc4 \uadf8\ub8f9\ud654\ub85c \uc815\ud588\uc9c0\ub9cc \uc774\uac83\uc774 \uac00\uc7a5 \uc801\ud569\ud55c \uc774\ub984\uc778\uc9c0\ub294 \ubaa8\ub974\uaca0\uc2b5\ub2c8\ub2e4. MySQL\uc758 GROUP_CONCAT \ud568\uc218<\/a> \ub610\ub294 FOR XML PATH('')<\/code> SQL Server\uc758 \ud574\uacb0 \ubc29\ubc95<\/a>? \uc774\uac83\uc774 \ubc14\ub85c \uc81c\uac00 \uc624\ub298 \uc774 \uae00\uc744 \uc4f0\ub294 \uc774\uc720\uc785\ub2c8\ub2e4. Couchbase Server\ub97c \uc0ac\uc6a9\ud558\uba74 \uac00\uc7a5 \uc27d\uac8c \ud560 \uc218 \uc788\ub294 \ubc29\ubc95\uc740 N1QL\uc758 ARRAY_AGG<\/code> \ud568\uc218\ub97c \uc0ac\uc6a9\ud560 \uc218\ub3c4 \uc788\uc9c0\ub9cc, \uad6c\uc2dd MapReduce \ubcf4\uae30\ub97c \uc0ac\uc6a9\ud558\uc5ec \uc218\ud589\ud560 \uc218\ub3c4 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n<\/div>\n

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\uc774 \uae00\uc744 \uc4f0\ub294 \uc774\uc720\ub294 \uc800\ud76c \uc194\ub8e8\uc158 \uc5d4\uc9c0\ub2c8\uc5b4 \uc911 \ud55c \uba85\uc774 \ud55c \uace0\uac1d(\uc774\ub984\uc744 \ubc1d\ud788\uc9c0 \uc54a\uaca0\uc2b5\ub2c8\ub2e4)\uc744 \uc704\ud574 \uc774 \ubb38\uc81c\ub97c \ud574\uacb0\ud558\uace0 \uc788\uc5c8\uae30 \ub54c\ubb38\uc785\ub2c8\ub2e4. \uc6b0\ub9ac \ub458 \ub2e4 \ud574\ub2f5\uc774 \ub2f4\uae34 \ube14\ub85c\uadf8 \uac8c\uc2dc\ubb3c\uc744 \ucc3e\uc744 \uc218 \uc5c6\uc5c8\uae30 \ub54c\ubb38\uc5d0 \ud568\uaed8 \ud574\uacb0\ucc45\uc744 \uc0dd\uac01\ud574\ub0b8 \ud6c4 \ubbf8\ub798\uc758 \uc800\ub97c \uc704\ud574 \ube14\ub85c\uadf8\uc5d0 \uc62c\ub9ac\uae30\ub85c \uacb0\uc815\ud588\uc2b5\ub2c8\ub2e4(\uc0ac\uc2e4 \uc81c\uac00 \ube14\ub85c\uadf8\uc5d0 \uae00\uc744 \uc4f0\ub294 \uc8fc\ub41c \uc774\uc720\uc774\uae30\ub3c4 \ud569\ub2c8\ub2e4). \ub610 \ub2e4\ub978 \uc774\uc720\ub294 \ub2e4\ub978 \uc0ac\ub78c\uc774 \ub354 \uc88b\uc740 \ubc29\ubc95\uc744 \uc54c\uace0 \uc788\ub294\uc9c0 \uc54c\uc544\ubcf4\uae30 \uc704\ud574\uc11c\uc785\ub2c8\ub2e4.)<\/p>\n<\/div>\n

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\uc2dc\uc791\ud558\uae30 \uc804\uc5d0 \uba87 \uac00\uc9c0 \uc790\ub8cc\ub97c \uc900\ube44\ud574 \ub450\uc5c8\uc73c\ub2c8 \ucc38\uace0\ud558\uc2dc\uae30 \ubc14\ub78d\ub2c8\ub2e4. \uc774 \uac8c\uc2dc\ubb3c\uc5d0 \uc0ac\uc6a9\ub41c '\ud658\uc790' \ub370\uc774\ud130\ub97c \uc0dd\uc131\ud558\ub294 \ub370 \uc0ac\uc6a9\ud55c \uc18c\uc2a4 \ucf54\ub4dc \ub294 \uae43\ud5c8\ube0c\uc5d0\uc11c \uc0ac\uc6a9\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/a>. NET\uc5d0 \uc775\uc219\ud558\uc9c0 \uc54a\ub2e4\uba74, \uadf8\ub0e5 cbimport<\/a> on \uc0d8\ud50c \ub370\uc774\ud130<\/a> \ub97c \ub9cc\ub4e4 \uc218 \uc788\uc2b5\ub2c8\ub2e4. (\ub610\ub294 N1QL \uc0cc\ub4dc\ubc15\uc2a4<\/a>\uc5d0 \ub300\ud55c \uc790\uc138\ud55c \ub0b4\uc6a9\uc740 \ub098\uc911\uc5d0 \uc124\uba85\ud569\ub2c8\ub2e4.) \uc774 \ube14\ub85c\uadf8 \uac8c\uc2dc\ubb3c\uc758 \ub098\uba38\uc9c0 \ubd80\ubd84\uc5d0\uc11c\ub294 \ud574\ub2f9 \uc0d8\ud50c \ub370\uc774\ud130\uac00 \ub4e4\uc5b4 \uc788\ub294 '\ud658\uc790' \ubc84\ud0b7\uc774 \uc788\ub2e4\uace0 \uac00\uc815\ud569\ub2c8\ub2e4.<\/p>\n<\/div>\n

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\uc694\uad6c \uc0ac\ud56d<\/h2>\n
\n
\n

\ud658\uc790 \ubb38\uc11c\uac00 \uac00\ub4dd \uc313\uc5ec \uc788\uc2b5\ub2c8\ub2e4. \uac01 \ud658\uc790\uc5d0\ub294 \ud55c \uba85\uc758 \uc758\uc0ac\uac00 \uc788\uc2b5\ub2c8\ub2e4. \ud658\uc790 \ubb38\uc11c\ub294 \ub2e4\uc74c\uacfc \uac19\uc740 \ud544\ub4dc\ub85c \uc758\uc0ac\ub97c \uac00\ub9ac\ud0b5\ub2c8\ub2e4. doctorId<\/code>. \ud658\uc790 \ubb38\uc11c\uc5d0\ub294 \ub2e4\ub978 \ub370\uc774\ud130\ub3c4 \uc788\uc744 \uc218 \uc788\uc9c0\ub9cc, \uc8fc\ub85c \ud658\uc790 \ubb38\uc11c\uc758 \ud0a4\uc640 doctorId<\/code> \uac12\uc73c\ub85c \uc124\uc815\ud569\ub2c8\ub2e4. \uba87 \uac00\uc9c0 \uc608\uc785\ub2c8\ub2e4:<\/p>\n<\/div>\n

\n
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key 01257721\r\n{\r\n    \"doctorId\": 58,\r\n    \"patientName\": \"Robyn Kirby\",\r\n    \"patientDob\": \"1986-05-16T19:01:52.4075881-04:00\"\r\n}\r\n\r\nkey 116wmq8i\r\n{\r\n    \"doctorId\": 8,\r\n    \"patientName\": \"Helen Clark\",\r\n    \"patientDob\": \"2016-02-01T04:54:30.3505879-05:00\"\r\n}<\/code><\/pre>\n<\/div>\n<\/div>\n
\n
\ub2e4\uc74c\uc73c\ub85c, \uac01 \uc758\uc0ac\uac00 \uc5ec\ub7ec \uba85\uc758 \ud658\uc790\ub97c \uac00\uc9c8 \uc218 \uc788\ub2e4\uace0 \uac00\uc815\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uc758\uc0ac \ubb38\uc11c\uac00 \uc874\uc7ac\ud55c\ub2e4\uace0 \uac00\uc815\ud560 \uc218\ub3c4 \uc788\uc9c0\ub9cc \uc774 \ud29c\ud1a0\ub9ac\uc5bc\uc5d0\uc11c\ub294 \uc2e4\uc81c\ub85c \ud544\uc694\ud558\uc9c0 \uc54a\uc73c\ubbc0\ub85c \uc9c0\uae08\uc740 \ud658\uc790\uc5d0\ub9cc \uc9d1\uc911\ud574 \ubcf4\uaca0\uc2b5\ub2c8\ub2e4.<\/p>\n<\/div>\n
\n
\ub9c8\uc9c0\ub9c9\uc73c\ub85c, \uc6b0\ub9ac\uac00 \uc560\ud50c\ub9ac\ucf00\uc774\uc158(\ub610\ub294 \ubcf4\uace0\uc11c \ub4f1)\uc5d0\uc11c \uc6d0\ud558\ub294 \uac83\uc740 \uc758\uc0ac\uc640 \ud568\uaed8 \ud658\uc790\ub97c \uc885\ud569\uc801\uc73c\ub85c \uadf8\ub8f9\ud654\ud558\ub294 \uac83\uc785\ub2c8\ub2e4. \uac01 \ub808\ucf54\ub4dc\ub294 \uc758\uc0ac\uc640 \ud658\uc790 \ubaa9\ub85d\/\ubc30\uc5f4\/\ubaa8\uc74c\uc744 \uc2dd\ubcc4\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uc608\ub97c \ub4e4\uc5b4<\/p>\n<\/div>\n\n\n\n<\/colgroup>\n\n\n\n\n\n\n
 
\uc758\uc0ac<\/th>\n\ud658\uc790<\/th>\n<\/tr>\n<\/thead>\n
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58<\/p>\n<\/td>\n
\n
01257721, 450MKKRI, 8G2MRZE2 ...<\/p>\n<\/td>\n<\/tr>\n
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8<\/p>\n<\/td>\n
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05WOKNFK, 116WMQ8I, 2T5YTTQI ...<\/p>\n<\/td>\n<\/tr>\n
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... \ub4f1 ...<\/p>\n<\/td>\n
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... \ub4f1 ...<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
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\uc608\ub97c \ub4e4\uc5b4 \uc758\uc0ac\uc5d0\uac8c \ubc30\uc815\ub41c \ubaa8\ub4e0 \ud658\uc790\ub97c \ubcf4\uc5ec\uc8fc\ub294 \ub300\uc2dc\ubcf4\ub4dc\uc5d0 \uc720\uc6a9\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uc774 \ud615\uc2dd\uc758 \ub370\uc774\ud130\ub97c N1QL \ub610\ub294 MapReduce\ub85c \uc5b4\ub5bb\uac8c \uac00\uc838\uc62c \uc218 \uc788\uc744\uae4c\uc694?<\/p>\n<\/div>\n<\/div>\n<\/div>\n
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N1QL \uc9d1\uacc4 \uadf8\ub8f9\ud654<\/h2>\n
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N1QL<\/a> \ub294 \uc6b0\ub9ac\uc5d0\uac8c ARRAY_AGG<\/code> \ud568\uc218<\/a> \ub97c \uc0ac\uc6a9\ud558\uc5ec \uc774\ub97c \uac00\ub2a5\ud558\uac8c \ud569\ub2c8\ub2e4.<\/p>\n<\/div>\n
\n
\uba3c\uc800 \uac01 \ud658\uc790 \ubb38\uc11c\uc5d0\uc11c \uc758\uc0ac ID\uc640 \ud658\uc790 \ubb38\uc11c\uc758 \ud0a4\ub97c \uc120\ud0dd\ud569\ub2c8\ub2e4. \uadf8\ub7f0 \ub2e4\uc74c ARRAY_AGG<\/code> \ub97c \ud658\uc790 \ubb38\uc11c ID\uc5d0 \ucd94\uac00\ud569\ub2c8\ub2e4. \ub9c8\uc9c0\ub9c9\uc73c\ub85c \uc758\uc0ac ID\ubcc4\ub85c \uacb0\uacfc\ub97c \uadf8\ub8f9\ud654\ud569\ub2c8\ub2e4.<\/p>\n<\/div>\n
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SELECT p.doctorId AS doctor, ARRAY_AGG(META(p).id) AS patients\r\nFROM patients p\r\nGROUP BY p.doctorId;<\/code><\/pre>\n<\/div>\n<\/div>\n
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\ucc38\uace0: \uc2e4\ud589\ud558\ub294 \uac83\uc744 \uc78a\uc9c0 \ub9c8\uc138\uc694. \ud658\uc790\uc5d0 \ub300\ud55c \uae30\ubcf8 \uc9c0\ud45c \ub9cc\ub4e4\uae30<\/code> \ub97c \uc0ac\uc6a9\ud558\uc5ec \uae30\ubcf8 \uc778\ub371\uc2a4 \uc2a4\uce94\uc744 \ud65c\uc131\ud654\ud569\ub2c8\ub2e4.<\/em><\/p>\n<\/div>\n
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\uc774 \ucffc\ub9ac\uc5d0 ARRAY_AGG<\/code>. \uac01 \ud658\uc790\uc5d0 \ub300\ud574 \ud558\ub098\uc758 \ub808\ucf54\ub4dc\ub97c \ubc18\ud658\ud569\ub2c8\ub2e4. \uc5ec\uae30\uc5d0 ARRAY_AGG<\/code> \ubc0f \uadf8\ub8f9 \uae30\uc900<\/code>\uc774\uc81c \uac01 \uc758\uc0ac\uc5d0 \ub300\ud574 \ud558\ub098\uc758 \uae30\ub85d\uc744 \ubc18\ud658\ud569\ub2c8\ub2e4.<\/p>\n<\/div>\n
\n
\ub2e4\uc74c\uc740 \uc81c\uac00 \ub9cc\ub4e0 \uc0d8\ud50c \ub370\uc774\ud130 \uc138\ud2b8\uc5d0 \ub300\ud55c \uacb0\uacfc\uc758 \uc77c\ubd80\uc785\ub2c8\ub2e4:<\/p>\n<\/div>\n
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\"Aggregate<\/span><\/p>\n<\/div>\n
\n
\ubc84\ud0b7\uc744 \uc0dd\uc131\ud558\uace0 \uc0d8\ud50c \ub370\uc774\ud130\ub97c \uac00\uc838\uc624\ub294 \ubc88\uac70\ub85c\uc6c0\uc744 \uacaa\uace0 \uc2f6\uc9c0 \uc54a\ub2e4\uba74 N1QL \ud29c\ud1a0\ub9ac\uc5bc \uc0cc\ub4dc\ubc15\uc2a4<\/a>. \uc5ec\uae30\uc5d0\ub294 \ud658\uc790 \ubb38\uc11c\uac00 \uc5c6\uc73c\ubbc0\ub85c \ucffc\ub9ac\uac00 \uc57d\uac04 \ub2ec\ub77c\uc9d1\ub2c8\ub2e4.<\/p>\n<\/div>\n
\n
\uc774\uba54\uc77c\uc744 \uc5f0\ub839\ubcc4\ub85c \uadf8\ub8f9\ud654\ud574 \ubcf4\uaca0\uc2b5\ub2c8\ub2e4. \uba3c\uc800 \uac01 \ubb38\uc11c\uc5d0\uc11c \uc5f0\ub839\uc744 \uc120\ud0dd\ud558\uace0 \uac01 \ubb38\uc11c\uc5d0\uc11c \uc774\uba54\uc77c\uc744 \uc120\ud0dd\ud569\ub2c8\ub2e4. \uadf8\ub7f0 \ub2e4\uc74c ARRAY_AGG<\/code> \uc744 \uc774\uba54\uc77c\uc5d0 \ucd94\uac00\ud569\ub2c8\ub2e4. \ub9c8\uc9c0\ub9c9\uc73c\ub85c \uacb0\uacfc\ub97c \uc5f0\ub839\ubcc4\ub85c \uadf8\ub8f9\ud654\ud569\ub2c8\ub2e4.<\/p>\n<\/div>\n
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SELECT t.age AS age, ARRAY_AGG(t.email) AS emails\r\nFROM tutorial t\r\ngroup by t.age;<\/code><\/pre>\n<\/div>\n<\/div>\n
\n
\ub2e4\uc74c\uc740 \uc0cc\ub4dc\ubc15\uc2a4 \uacb0\uacfc\uc758 \uc77c\ubd80 \uc2a4\ud06c\ub9b0\uc0f7\uc785\ub2c8\ub2e4:<\/p>\n<\/div>\n
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\"N1QL<\/span><\/p>\n<\/div>\n<\/div>\n<\/div>\n
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MapReduce\ub97c \uc0ac\uc6a9\ud55c \uadf8\ub8f9 \uc9d1\uacc4<\/h2>\n
\n
\n
\ub9f5\ub9ac\ub4c0\uc2a4 \ubdf0\ub97c \uc0ac\uc6a9\ud558\uc5ec \uc720\uc0ac\ud55c \uc9d1\uacc4 \uadf8\ub8f9\ud654\ub97c \uc218\ud589\ud560 \uc218\ub3c4 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n<\/div>\n
\n
\uba3c\uc800 \uc0c8 \ubcf4\uae30\ub97c \ub9cc\ub4ed\ub2c8\ub2e4. Couchbase \ucf58\uc194\uc5d0\uc11c \uc778\ub371\uc2a4\ub85c \uc774\ub3d9\ud55c \ub2e4\uc74c \ubdf0\ub85c \uc774\ub3d9\ud569\ub2c8\ub2e4. \"\ud658\uc790\" \ubc84\ud0b7\uc744 \uc120\ud0dd\ud569\ub2c8\ub2e4. \"\uac1c\ubc1c \ubdf0 \ub9cc\ub4e4\uae30\"\ub97c \ud074\ub9ad\ud569\ub2c8\ub2e4. \ub514\uc790\uc778 \ubb38\uc11c\uc758 \uc774\ub984\uc744 \uc9c0\uc815\ud569\ub2c8\ub2e4(\uc800\ub294 \"_design\/dev_patient\"\ub77c\uace0 \ud569\ub2c8\ub2e4. \ubdf0\ub97c \ub9cc\ub4ed\ub2c8\ub2e4(\uc800\ub294 \"doctorPatientGroup\"\uc774\ub77c\uace0 \ud569\ub2c8\ub2e4).<\/p>\n<\/div>\n
\n
\uc9c0\ub3c4\uc640 \uc0ac\uc6a9\uc790 \uc9c0\uc815 \ucd95\uc18c \ud568\uc218\uac00 \ubaa8\ub450 \ud544\uc694\ud569\ub2c8\ub2e4.<\/p>\n<\/div>\n
\n
\uba3c\uc800 \ub9f5\uc758 \uacbd\uc6b0, \uc758\uc0ac ID(\uadf8\ub8f9\ud654\ub97c \uc0ac\uc6a9\ud560 \uac83\uc774\ubbc0\ub85c \ubc30\uc5f4\ub85c)\uc640 \ud658\uc790\uc758 \ubb38\uc11c ID\ub9cc \uc788\uc73c\uba74 \ub429\ub2c8\ub2e4.<\/p>\n<\/div>\n
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function (doc, meta) {\r\n    emit([doc.doctorId], meta.id);\r\n}<\/code><\/pre>\n<\/div>\n<\/div>\n
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\ub2e4\uc74c\uc73c\ub85c, \ucd95\uc18c \ud568\uc218\uc758 \uacbd\uc6b0 \uac12\uc744 \uac00\uc838\uc640 \ubc30\uc5f4\ub85c \uc5f0\uacb0\ud569\ub2c8\ub2e4. \ub2e4\uc74c\uc740 \uc774\ub97c \uc218\ud589\ud560 \uc218 \uc788\ub294 \ud55c \uac00\uc9c0 \ubc29\ubc95\uc785\ub2c8\ub2e4. \uc800\ub294 \uc790\ubc14\uc2a4\ud06c\ub9bd\ud2b8 \uc804\ubb38\uac00\ub098 MapReduce \uc804\ubb38\uac00\uac00 \uc544\ub2c8\ubbc0\ub85c \ub354 \ud6a8\uc728\uc801\uc778 \ubc29\ubc95\uc774 \uc788\uc744 \uc218 \uc788\uc2b5\ub2c8\ub2e4:<\/p>\n<\/div>\n
\n
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function reduce(key, values, rereduce) {\r\n    var merged = [].concat.apply([], values);\r\n    return merged;\r\n}<\/code><\/pre>\n<\/div>\n<\/div>\n
\n
\ub9f5\uacfc \ucd95\uc18c \ud568\uc218\ub97c \ubaa8\ub450 \uc0dd\uc131\ud55c \ud6c4 \uc0c9\uc778\uc744 \uc800\uc7a5\ud569\ub2c8\ub2e4.<\/p>\n<\/div>\n
\n
\ub9c8\uc9c0\ub9c9\uc73c\ub85c \uc774 \uc778\ub371\uc2a4\ub97c \uc2e4\uc81c\ub85c \ud638\ucd9c\ud560 \ub54c \uadf8\ub8f9 \ub808\ubca8\uc744 1\ub85c \uc124\uc815\ud569\ub2c8\ub2e4. UI\uc5d0\uc11c \uc774 \uc791\uc5c5\uc744 \uc218\ud589\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4:<\/p>\n<\/div>\n
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\"Aggregate<\/span><\/p>\n<\/div>\n
\n
\ub610\ub294 \uc778\ub371\uc2a4 URL\uc5d0\uc11c \ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \ub2e4\uc74c\uc740 \uc81c \ub85c\uceec \ucef4\ud4e8\ud130\uc5d0\uc11c \uc2e4\ud589 \uc911\uc778 \ud074\ub7ec\uc2a4\ud130\uc758 \uc608\uc785\ub2c8\ub2e4:<\/p>\n<\/div>\n
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https:\/\/127.0.0.1:8092\/patients\/_design\/dev_patients\/_view\/doctorPatientGroup?connection_timeout=60000&full_set=true&group_level=1&inclusive_end=true&skip=0&stale=false<\/code><\/pre>\n<\/div>\n<\/div>\n
\n
\ud574\ub2f9 \ubdf0\uc758 \uacb0\uacfc\ub294 \ub2e4\uc74c\uacfc \uac19\uc544\uc57c \ud569\ub2c8\ub2e4(\ube14\ub85c\uadf8 \uac8c\uc2dc\ubb3c\uc5d0 \ubcf4\uae30 \uc88b\uac8c \uc798\ub77c\ub0b8 \ubaa8\uc2b5):<\/p>\n<\/div>\n
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{\"rows\":[\r\n{\"key\":[0],\"value\":[\"reo8th6f\",\"g53x9e8d\", ... ]},\r\n{\"key\":[1],\"value\":[\"k4xkhmki\",\"g1jtc0oj\", ... ]},\r\n{\"key\":[2],\"value\":[\"spp6gf3k\",\"3z93wyan\"]},\r\n{\"key\":[3],\"value\":[\"qnx93fh3\",\"gssusiun\", ...]},\r\n{\"key\":[4],\"value\":[\"qvqgb0ve\",\"jm0g69zz\", ...]},\r\n{\"key\":[5],\"value\":[\"ywjfvad6\",\"so4uznxx\", ...]}\r\n...\r\n]}<\/code><\/pre>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
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\uc694\uc57d<\/h2>\n
\n
\n
N1QL \ubc29\ubc95\uc774 \ub354 \uc27d\ub2e4\uace0 \uc0dd\uac01\ud558\uc9c0\ub9cc \uacbd\uc6b0\uc5d0 \ub530\ub77c\uc11c\ub294 MapReduce\ub97c \uc0ac\uc6a9\ud558\ub294 \uac83\uc774 \uc131\ub2a5\uc0c1 \uc774\uc810\uc774 \uc788\uc744 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \ub450 \uacbd\uc6b0 \ubaa8\ub450 \uad00\uacc4\ud615 \ub370\uc774\ud130\ubca0\uc774\uc2a4\uc5d0\uc11c\uc640 \ub9c8\ucc2c\uac00\uc9c0\ub85c \uc27d\uac8c(\ub354 \uc27d\uc9c0\ub294 \uc54a\ub354\ub77c\ub3c4) \uc9d1\uacc4 \uadf8\ub8f9\ud654\ub97c \uc218\ud589\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n<\/div>\n
\n
N1QL\uc5d0 \ub300\ud574 \ub354 \uc790\uc138\ud788 \uc54c\uace0 \uc2f6\uc73c\uc2e0\uac00\uc694? \ub2e4\uc74c\uc744 \ud655\uc778\ud574 \ubcf4\uc138\uc694. \uc804\uccb4 N1QL \ud29c\ud1a0\ub9ac\uc5bc\/\uc0cc\ub4dc\ubc15\uc2a4<\/a>. MapReduce \ubcf4\uae30\uc5d0 \uad00\uc2ec\uc774 \uc788\uc73c\uc2e0\uac00\uc694? \ub9f5\ub9ac\ub4c0\uc2a4\uc758 \ub9f5\ub9ac\ub4c0\uc2a4 \ubdf0 \ubb38\uc11c<\/a> \ub97c \ud074\ub9ad\ud558\uc5ec \uc2dc\uc791\ud558\uc138\uc694.<\/p>\n<\/div>\n
\n
\uc774 \uac8c\uc2dc\ubb3c\uc774 \uc720\uc6a9\ud588\ub098\uc694? \uac1c\uc120\ud560 \uc810\uc774 \uc788\uc73c\uc2e0\uac00\uc694? \uc544\ub798\uc5d0 \ub313\uae00\uc744 \ub0a8\uae30\uac70\ub098 \ub2e4\uc74c \uc5f0\ub77d\ucc98\ub85c \ubb38\uc758\ud574 \uc8fc\uc138\uc694. \ud2b8\uc704\ud130 @mgroves<\/a>.<\/p>\n<\/div>\n<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"
Aggregate grouping is what I\u2019m titling this blog post, but I don\u2019t know if it\u2019s the best name. Have you ever used MySQL\u2019s GROUP_CONCAT function or the FOR XML PATH(”) workaround in SQL Server? That\u2019s basically what I\u2019m writing about […]<\/p>","protected":false},"author":71,"featured_media":3956,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[1814,1816,1819,1812],"tags":[2041,2042],"ppma_author":[8937],"class_list":["post-3955","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-application-design","category-couchbase-server","category-data-modeling","category-n1ql-query","tag-aggregation","tag-grouping"],"acf":[],"yoast_head":"\nAggregate grouping with N1QL \/ MapReduce - The Couchbase Blog<\/title>\n<meta name=\"description\" content=\"Aggregate grouping (similar to GROUP_CONCAT) can be done in Couchbase Server with N1QL's ARRAY_AGG or with a MapReduce View.\" \/>\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\/aggregate-grouping-n1ql-mapreduce\/\" \/>\n<meta property=\"og:locale\" content=\"ko_KR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Aggregate grouping with N1QL \/ MapReduce\" \/>\n<meta property=\"og:description\" content=\"Aggregate grouping (similar to GROUP_CONCAT) can be done in Couchbase Server with N1QL's ARRAY_AGG or with a MapReduce View.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.couchbase.com\/blog\/ko\/aggregate-grouping-n1ql-mapreduce\/\" \/>\n<meta property=\"og:site_name\" content=\"The Couchbase Blog\" \/>\n<meta property=\"article:published_time\" content=\"2017-08-22T17:00:34+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-06-14T00:32:59+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.couchbase.com\/blog\/wp-content\/uploads\/sites\/1\/2017\/08\/075-hero-aggregate-grouping.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1280\" \/>\n\t<meta property=\"og:image:height\" content=\"731\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Matthew Groves\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@mgroves\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Matthew Groves\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"5\ubd84\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.couchbase.com\/blog\/aggregate-grouping-n1ql-mapreduce\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.couchbase.com\/blog\/aggregate-grouping-n1ql-mapreduce\/\"},\"author\":{\"name\":\"Matthew Groves\",\"@id\":\"https:\/\/www.couchbase.com\/blog\/#\/schema\/person\/3929663e372020321b0152dc4fa65a58\"},\"headline\":\"Aggregate grouping with N1QL \/ MapReduce\",\"datePublished\":\"2017-08-22T17:00:34+00:00\",\"dateModified\":\"2025-06-14T00:32:59+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.couchbase.com\/blog\/aggregate-grouping-n1ql-mapreduce\/\"},\"wordCount\":901,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/www.couchbase.com\/blog\/#organization\"},\"image\":{\"@id\":\"https:\/\/www.couchbase.com\/blog\/aggregate-grouping-n1ql-mapreduce\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.couchbase.com\/blog\/wp-content\/uploads\/sites\/1\/2017\/08\/075-hero-aggregate-grouping.jpg\",\"keywords\":[\"aggregation\",\"grouping\"],\"articleSection\":[\"Application Design\",\"Couchbase Server\",\"Data Modeling\",\"SQL++ \/ N1QL Query\"],\"inLanguage\":\"ko-KR\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.couchbase.com\/blog\/aggregate-grouping-n1ql-mapreduce\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.couchbase.com\/blog\/aggregate-grouping-n1ql-mapreduce\/\",\"url\":\"https:\/\/www.couchbase.com\/blog\/aggregate-grouping-n1ql-mapreduce\/\",\"name\":\"Aggregate grouping with N1QL \/ MapReduce - 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Groves\ub294 \ucf54\ub529\uc744 \uc88b\uc544\ud558\ub294 \uc0ac\ub78c\uc785\ub2c8\ub2e4. C#, jQuery, PHP \ub4f1 \ubb34\uc5c7\uc774\ub4e0 \ud480 \ub9ac\ud018\uc2a4\ud2b8\ub97c \uc81c\ucd9c\ud560 \uc815\ub3c4\ub85c \ucf54\ub529\uc744 \uc88b\uc544\ud569\ub2c8\ub2e4. 90\ub144\ub300\uc5d0 \ubd80\ubaa8\ub2d8\uc758 \ud53c\uc790 \uac00\uac8c\ub97c \uc704\ud574 QuickBASIC POS \uc571\uc744 \ub9cc\ub4e0 \uc774\ud6c4\ub85c \uc804\ubb38\uc801\uc73c\ub85c \ucf54\ub529\uc744 \ud574\uc654\uc2b5\ub2c8\ub2e4. \ud604\uc7ac Couchbase\uc758 \uc120\uc784 \uc81c\ud488 \ub9c8\ucf00\ud305 \uad00\ub9ac\uc790\ub85c \uc77c\ud558\uace0 \uc788\uc2b5\ub2c8\ub2e4. \uc5ec\uac00 \uc2dc\uac04\uc5d0\ub294 \uac00\uc871\uacfc \ud568\uaed8 \ucd95\uad6c \uacbd\uae30\ub97c \uad00\ub78c\ud558\uace0 \uac1c\ubc1c\uc790 \ucee4\ubba4\ub2c8\ud2f0\uc5d0 \ucc38\uc5ec\ud558\uba70 \uc2dc\uac04\uc744 \ubcf4\ub0c5\ub2c8\ub2e4. \uadf8\ub294 .NET\uc758 AOP, .NET\uc758 \ud504\ub85c \ub9c8\uc774\ud06c\ub85c\uc11c\ube44\uc2a4, Pluralsight \uc800\uc790, Microsoft MVP\uc758 \uc800\uc790\uc774\uae30\ub3c4 \ud569\ub2c8\ub2e4.","sameAs":["https:\/\/crosscuttingconcerns.com","https:\/\/x.com\/mgroves"],"url":"https:\/\/www.couchbase.com\/blog\/ko\/author\/matthew-groves\/"}]}},"authors":[{"term_id":8937,"user_id":71,"is_guest":0,"slug":"matthew-groves","display_name":"Matthew Groves","avatar_url":"https:\/\/secure.gravatar.com\/avatar\/70feb1b28a099ad0112b8d21fe1e81e1a4524beed3e20b7f107d5370e85a07ab?s=96&d=mm&r=g","author_category":"","last_name":"Groves","first_name":"Matthew","job_title":"","user_url":"https:\/\/crosscuttingconcerns.com","description":"Matthew D. Groves\ub294 \ucf54\ub529\uc744 \uc88b\uc544\ud558\ub294 \uc0ac\ub78c\uc785\ub2c8\ub2e4.  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