{"id":2932,"date":"2026-05-07T10:13:50","date_gmt":"2026-05-07T02:13:50","guid":{"rendered":"https:\/\/tekno.bali-island.com\/?p=2932"},"modified":"2026-05-07T10:13:54","modified_gmt":"2026-05-07T02:13:54","slug":"sql-%eb%8d%b0%ec%9d%b4%ed%84%b0%eb%b2%a0%ec%9d%b4%ec%8a%a4%ec%97%90%ec%84%9c-join-%ea%b0%9c%eb%85%90-%ec%9d%b4%ed%95%b4%ed%95%98%ea%b8%b0","status":"publish","type":"post","link":"https:\/\/tekno.bali-island.com\/ko\/articles\/sql-%eb%8d%b0%ec%9d%b4%ed%84%b0%eb%b2%a0%ec%9d%b4%ec%8a%a4%ec%97%90%ec%84%9c-join-%ea%b0%9c%eb%85%90-%ec%9d%b4%ed%95%b4%ed%95%98%ea%b8%b0\/","title":{"rendered":"SQL \ub370\uc774\ud130\ubca0\uc774\uc2a4\uc5d0\uc11c JOIN \uac1c\ub150 \uc774\ud574\ud558\uae30"},"content":{"rendered":"\n<p><strong>JOIN<\/strong>\uc740 SQL\uc5d0\uc11c \uad00\ub828\ub41c \uac12\uc744 \uac00\uc9c4 \uc5f4\uc744 \uae30\uc900\uc73c\ub85c \ub450 \uac1c \uc774\uc0c1\uc758 \ud14c\uc774\ube14\uc5d0\uc11c \ud589\uc744 \uacb0\ud569\ud558\ub294 \ub370 \uc0ac\uc6a9\ub418\ub294 \uad6c\ubb38\uc785\ub2c8\ub2e4. \uc8fc\uc694 \ubaa9\uc801\uc740 \uc644\uc804\ud558\uace0 \ud3ec\uad04\uc801\uc778 \uc815\ubcf4\ub97c \uac00\uc9c4 \ub2e8\uc77c \ub370\uc774\ud130 \uc138\ud2b8\ub97c \uc5bb\ub294 \uac83\uc785\ub2c8\ub2e4. \uc5ec\uae30\uc11c &#8220;\uc644\uc804\ud558\ub2e4&#8221;\ub294 \uac83\uc740 \ud14c\uc774\ube14 \uac04\uc758 \uad00\uacc4\uc5d0\uc11c \ub098\uc628 \uc5f4\ub4e4\uc758 \uacb0\ud569\uc744 \ud1b5\ud574 \uc5bb\uc740 \ub370\uc774\ud130 \uad6c\uc870\ub97c \uc758\ubbf8\ud569\ub2c8\ub2e4.<\/p>\n\n\n\n<p>\ub2e4\uc591\ud55c \ub370\uc774\ud130 \uac80\uc0c9 \uc694\uad6c\ub97c \ucda9\uc871\ud558\uae30 \uc704\ud574 JOIN \uba85\ub839\uc740 <strong>OUTER JOIN<\/strong>, <strong>INNER JOIN<\/strong>, <strong>RIGHT JOIN<\/strong>, <strong>LEFT JOIN<\/strong>\uacfc \uac19\uc740 \uc5ec\ub7ec \uc720\ud615\uc73c\ub85c \ub098\ub269\ub2c8\ub2e4.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>SQL JOIN \uc720\ud615 \uac04\uc758 \ucc28\uc774\uc810<\/strong><\/h2>\n\n\n\n<p>\ub2e4\uc74c\uc740 \ub2e4\uc591\ud55c JOIN \uad6c\ubb38\uc5d0 \ub300\ud55c \uc124\uba85\uacfc \uc608\uc2dc \uad6c\ubb38\uc73c\ub85c, \ucc28\uc774\uc810\uc744 \uc774\ud574\ud558\ub294 \ub370 \ub3c4\uc6c0\uc744 \ub4dc\ub9bd\ub2c8\ub2e4.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>1. FULL OUTER JOIN<\/strong><\/h3>\n\n\n\n<p>Outer join(\ub610\ub294 Full Outer Join)\uc740 \uacb0\ud569\ub418\ub294 \ub450 \ud14c\uc774\ube14 \ubaa8\ub450\uc5d0\uc11c \uc77c\uce58\ud558\ub294 \uac12\uc774 \uc788\ub4e0 \uc5c6\ub4e0 \ubaa8\ub4e0 \ub808\ucf54\ub4dc(\ud589)\ub97c \ubc18\ud658\ud569\ub2c8\ub2e4. \ub450 \ud14c\uc774\ube14 \uc0ac\uc774\uc5d0 \uc77c\uce58\ud558\ub294 \ub370\uc774\ud130\uac00 \uc5c6\uc73c\uba74 \uacb0\ud569 \uacb0\uacfc\uc5d0\uc11c \ub204\ub77d\ub41c \ucabd\uc740 \uc790\ub3d9\uc73c\ub85c NULL \uac12\uc73c\ub85c \ucc44\uc6cc\uc9d1\ub2c8\ub2e4.<\/p>\n\n\n\n<p><strong>\uad6c\ubb38:<\/strong><\/p>\n\n\n\n<p>SQL<\/p>\n\n\n\n<p>SELECT column_name(s)<\/p>\n\n\n\n<p>FROM table1<\/p>\n\n\n\n<p>FULL OUTER JOIN table2<\/p>\n\n\n\n<p>ON table1.column_name = table2.column_name<\/p>\n\n\n\n<p>WHERE condition;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>2. LEFT JOIN<\/strong><\/h3>\n\n\n\n<p>Left Join\uc740 \uacb0\ud569\ub418\ub294 \ub450 \ud14c\uc774\ube14 \uc911 \uc67c\ucabd \ud14c\uc774\ube14(\uccab \ubc88\uc9f8 \ud14c\uc774\ube14)\uc758 \ubaa8\ub4e0 \ub808\ucf54\ub4dc\ub97c \ubc18\ud658\ud558\ub294 \uc5f0\uc0b0\uc785\ub2c8\ub2e4. \uc67c\ucabd \ud14c\uc774\ube14\uc758 \uac12\uc774 \uc624\ub978\ucabd \ud14c\uc774\ube14(\ub450 \ubc88\uc9f8 \ud14c\uc774\ube14)\uc758 \ub370\uc774\ud130\uc640 \uc77c\uce58\ud558\uc9c0 \uc54a\ub354\ub77c\ub3c4 \uc67c\ucabd \ud14c\uc774\ube14\uc758 \ubaa8\ub4e0 \ub370\uc774\ud130\ub294 \uc720\uc9c0\ub418\uc5b4 \ud45c\uc2dc\ub429\ub2c8\ub2e4. \uc77c\uce58\ud558\ub294 \ud56d\ubaa9\uc774 \uc5c6\ub294 \uc624\ub978\ucabd \ud14c\uc774\ube14\uc758 \ub370\uc774\ud130\ub294 NULL\ub85c \ub300\uccb4\ub429\ub2c8\ub2e4.<\/p>\n\n\n\n<p><strong>\uad6c\ubb38:<\/strong><\/p>\n\n\n\n<p>SQL<\/p>\n\n\n\n<p>SELECT column_name(s)<\/p>\n\n\n\n<p>FROM table1<\/p>\n\n\n\n<p>LEFT JOIN table2<\/p>\n\n\n\n<p>ON table1.column_name = table2.column_name;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>3. RIGHT JOIN (\ubcf4\ucda9)<\/strong><\/h3>\n\n\n\n<p>Left Join\uc758 \ubc18\ub300 \uac1c\ub150\uc73c\ub85c, Right Join \uad6c\ubb38\uc740 \uc624\ub978\ucabd \ud14c\uc774\ube14(\ub450 \ubc88\uc9f8 \ud14c\uc774\ube14)\uc758 \ubaa8\ub4e0 \ub808\ucf54\ub4dc\uc640 \ud568\uaed8 \uc67c\ucabd \ud14c\uc774\ube14\uc5d0\uc11c \uc77c\uce58\ud558\ub294 \ub370\uc774\ud130\ub97c \ubc18\ud658\ud569\ub2c8\ub2e4. \uc67c\ucabd \ud14c\uc774\ube14\uc5d0 \uc77c\uce58\ud558\ub294 \ub370\uc774\ud130\uac00 \uc5c6\uc73c\uba74 \uc67c\ucabd \uce21\uc758 \uacb0\uacfc\ub294 NULL\uc774 \ub429\ub2c8\ub2e4.<\/p>\n\n\n\n<p><strong>\uad6c\ubb38:<\/strong><\/p>\n\n\n\n<p>SQL<\/p>\n\n\n\n<p>SELECT column_name(s)<\/p>\n\n\n\n<p>FROM table1<\/p>\n\n\n\n<p>RIGHT JOIN table2<\/p>\n\n\n\n<p>ON table1.column_name = table2.column_name;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>4. INNER JOIN (\ubcf4\ucda9)<\/strong><\/h3>\n\n\n\n<p>Inner Join\uc740 \uac00\uc7a5 \uc790\uc8fc \uc0ac\uc6a9\ub418\ub294 \uad6c\ubb38 \uc720\ud615\uc785\ub2c8\ub2e4. Outer Join\uacfc \ub2ec\ub9ac Inner Join\uc740 \ub354 \uc5c4\uaca9\ud558\uac8c \uc791\ub3d9\ud558\uc5ec \uacb0\ud569\ub418\ub294 \ub450 \ud14c\uc774\ube14 \ubaa8\ub450\uc5d0 \uc77c\uce58\ud558\ub294 \ub370\uc774\ud130(\uad50\uc9d1\ud569)\uac00 \uc788\ub294 \ud589\ub9cc \ubc18\ud658\ud569\ub2c8\ub2e4.<\/p>\n\n\n\n<p><strong>\uad6c\ubb38:<\/strong><\/p>\n\n\n\n<p>SQL<\/p>\n\n\n\n<p>SELECT column_name(s)<\/p>\n\n\n\n<p>FROM table1<\/p>\n\n\n\n<p>INNER JOIN table2<\/p>\n\n\n\n<p>ON table1.column_name = table2.column_name;<\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>JOIN\uc740 SQL\uc5d0\uc11c \uad00\ub828\ub41c \uac12\uc744 \uac00\uc9c4 \uc5f4\uc744 \uae30\uc900\uc73c\ub85c \ub450 \uac1c \uc774\uc0c1\uc758 \ud14c\uc774\ube14\uc5d0\uc11c \ud589\uc744 \uacb0\ud569\ud558\ub294 \ub370 \uc0ac\uc6a9\ub418\ub294 \uad6c\ubb38\uc785\ub2c8\ub2e4. \uc8fc\uc694 \ubaa9\uc801\uc740 \uc644\uc804\ud558\uace0 \ud3ec\uad04\uc801\uc778 \uc815\ubcf4\ub97c \uac00\uc9c4 \ub2e8\uc77c \ub370\uc774\ud130 \uc138\ud2b8\ub97c \uc5bb\ub294 \uac83\uc785\ub2c8\ub2e4. \uc5ec\uae30\uc11c &#8220;\uc644\uc804\ud558\ub2e4&#8221;\ub294 \uac83\uc740 \ud14c\uc774\ube14 \uac04\uc758 \uad00\uacc4\uc5d0\uc11c \ub098\uc628 \uc5f4\ub4e4\uc758 \uacb0\ud569\uc744 \ud1b5\ud574 \uc5bb\uc740 \ub370\uc774\ud130 \uad6c\uc870\ub97c \uc758\ubbf8\ud569\ub2c8\ub2e4. \ub2e4\uc591\ud55c \ub370\uc774\ud130 \uac80\uc0c9 \uc694\uad6c\ub97c \ucda9\uc871\ud558\uae30 \uc704\ud574 JOIN \uba85\ub839\uc740 OUTER JOIN, INNER JOIN, RIGHT JOIN, LEFT JOIN\uacfc \uac19\uc740 \uc5ec\ub7ec \uc720\ud615\uc73c\ub85c \ub098\ub269\ub2c8\ub2e4. SQL JOIN \uc720\ud615 \uac04\uc758 \ucc28\uc774\uc810 \ub2e4\uc74c\uc740 \ub2e4\uc591\ud55c JOIN \uad6c\ubb38\uc5d0 \ub300\ud55c \uc124\uba85\uacfc \uc608\uc2dc \uad6c\ubb38\uc73c\ub85c, \ucc28\uc774\uc810\uc744 \uc774\ud574\ud558\ub294 \ub370 \ub3c4\uc6c0\uc744 \ub4dc\ub9bd\ub2c8\ub2e4. 1. FULL OUTER JOIN Outer join(\ub610\ub294 Full Outer Join)\uc740 \uacb0\ud569\ub418\ub294 \ub450 \ud14c\uc774\ube14 \ubaa8\ub450\uc5d0\uc11c \uc77c\uce58\ud558\ub294 \uac12\uc774 \uc788\ub4e0 \uc5c6\ub4e0 \ubaa8\ub4e0 \ub808\ucf54\ub4dc(\ud589)\ub97c \ubc18\ud658\ud569\ub2c8\ub2e4. \ub450 \ud14c\uc774\ube14 \uc0ac\uc774\uc5d0 \uc77c\uce58\ud558\ub294 \ub370\uc774\ud130\uac00 \uc5c6\uc73c\uba74 \uacb0\ud569 \uacb0\uacfc\uc5d0\uc11c \ub204\ub77d\ub41c \ucabd\uc740 \uc790\ub3d9\uc73c\ub85c NULL \uac12\uc73c\ub85c \ucc44\uc6cc\uc9d1\ub2c8\ub2e4. \uad6c\ubb38: SQL SELECT column_name(s) FROM table1 FULL OUTER JOIN table2 ON table1.column_name = table2.column_name WHERE condition; 2. LEFT JOIN Left Join\uc740 \uacb0\ud569\ub418\ub294 \ub450 \ud14c\uc774\ube14 \uc911 \uc67c\ucabd \ud14c\uc774\ube14(\uccab \ubc88\uc9f8 \ud14c\uc774\ube14)\uc758 \ubaa8\ub4e0 \ub808\ucf54\ub4dc\ub97c \ubc18\ud658\ud558\ub294 \uc5f0\uc0b0\uc785\ub2c8\ub2e4. \uc67c\ucabd \ud14c\uc774\ube14\uc758 \uac12\uc774 \uc624\ub978\ucabd \ud14c\uc774\ube14(\ub450 \ubc88\uc9f8 \ud14c\uc774\ube14)\uc758 \ub370\uc774\ud130\uc640 \uc77c\uce58\ud558\uc9c0 \uc54a\ub354\ub77c\ub3c4 \uc67c\ucabd \ud14c\uc774\ube14\uc758 \ubaa8\ub4e0 \ub370\uc774\ud130\ub294 \uc720\uc9c0\ub418\uc5b4 \ud45c\uc2dc\ub429\ub2c8\ub2e4. \uc77c\uce58\ud558\ub294 \ud56d\ubaa9\uc774 \uc5c6\ub294 \uc624\ub978\ucabd \ud14c\uc774\ube14\uc758 \ub370\uc774\ud130\ub294 NULL\ub85c \ub300\uccb4\ub429\ub2c8\ub2e4. \uad6c\ubb38: SQL SELECT column_name(s) FROM table1 LEFT JOIN table2 ON table1.column_name = table2.column_name; 3. RIGHT JOIN (\ubcf4\ucda9) Left Join\uc758 \ubc18\ub300 \uac1c\ub150\uc73c\ub85c, Right Join \uad6c\ubb38\uc740 \uc624\ub978\ucabd \ud14c\uc774\ube14(\ub450 \ubc88\uc9f8 \ud14c\uc774\ube14)\uc758 \ubaa8\ub4e0 \ub808\ucf54\ub4dc\uc640 &hellip;<\/p>\n","protected":false},"author":1,"featured_media":2911,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[101],"tags":[],"class_list":["post-2932","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-101"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>SQL \ub370\uc774\ud130\ubca0\uc774\uc2a4\uc5d0\uc11c JOIN \uac1c\ub150 \uc774\ud574\ud558\uae30<\/title>\n<meta name=\"description\" content=\"\ub370\uc774\ud130 \uad00\ub9ac\ub97c \uc704\ud55c INNER JOIN, LEFT JOIN, RIGHT JOIN, FULL OUTER JOIN\uc758 JOIN 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