{"id":847,"date":"2015-12-28T10:27:35","date_gmt":"2015-12-28T10:27:35","guid":{"rendered":"http:\/\/haisins.epac.to\/wordpress\/?p=847"},"modified":"2015-12-28T10:27:35","modified_gmt":"2015-12-28T10:27:35","slug":"%e3%84%b4%ec%a0%9c4%ec%a0%88-%ea%b4%80%ea%b3%84relationship","status":"publish","type":"post","link":"http:\/\/haisins.synology.me\/wordpress\/?p=847","title":{"rendered":"\u3134\uc81c4\uc808 \uad00\uacc4(Relationship)"},"content":{"rendered":"<ul style=\"margin-left: 48pt\">\n<li>\n<div><span style=\"font-family:\ub9d1\uc740 \uace0\ub515; font-size:10pt\">\uad00\uacc4\uc758 \uac1c\ub150<br \/>\n<\/span><\/div>\n<p><span style=\"font-family:\ub9d1\uc740 \uace0\ub515; font-size:10pt\">\uac00. \uad00\uacc4\uc758 \uc815\uc758<br \/>\n<\/span><\/p>\n<ul>\n<li><span style=\"font-family:\ub9d1\uc740 \uace0\ub515; font-size:10pt\">\uc5d4\ud2f0\ud2f0\uc758 \uc778\uc2a4\ud134\uc2a4 \uc0ac\uc774\uc758 \ub17c\ub9ac\uc801\uc778 \uc5f0\uad00\uc131\uc73c\ub85c\uc11c \uc874\uc7ac\uc758 \ud615\ud0dc\ub85c\uc11c\ub098 \ud589\uc704\ub85c\uc11c \uc11c\ub85c\uc5d0\uac8c \uc5f0\uad00\uc131\uc774 \ubd80\uc5ec\ub41c \uc0c1\ud0dc<\/span>\n\t\t\t\t<\/li>\n<\/ul>\n<p><span style=\"font-family:\ub9d1\uc740 \uace0\ub515; font-size:10pt\">\ub098. \uad00\uacc4\uc758 \ud398\uc5b4\ub9c1<br \/>\n<\/span><\/p>\n<ul>\n<li>\n<div><span style=\"font-family:\ub9d1\uc740 \uace0\ub515; font-size:10pt\">\uad00\uacc4 \ud398\uc5b4\ub9c1 : \uc5d4\ud2f0\ud2f0\ub0b4\uc5d0 \uc778\uc2a4\ud134\uc2a4\uc640 \uc778\uc2a4\ud134\uc2a4 \uc0ac\uc774\uc5d0 \uad00\uacc4\uac00 \uc124\uc815\ub418\uc5b4 \uc788\ub294 \uc5b4\ucee4\ub7f0\uc2a4\ub97c \ub9d0\ud568.<\/span>\n\t\t\t\t\t<\/div>\n<p><img src=\"https:\/\/i0.wp.com\/oracledba.zapto.org\/wordpress\/wp-content\/uploads\/1\/cfile6.uf.2670B54056810E8D112DA5.png?w=640\" alt=\"\" data-recalc-dims=\"1\"\/>\n\t\t\t\t\t<\/p>\n<p>\u00a0<br \/>\n\u00a0<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<li>\n<div><span style=\"font-family:\ub9d1\uc740 \uace0\ub515; font-size:10pt\">\uad00\uacc4\uc758 \ubd84\ub958<br \/>\n<\/span><\/div>\n<p><img src=\"https:\/\/i0.wp.com\/oracledba.zapto.org\/wordpress\/wp-content\/uploads\/1\/cfile24.uf.2147AD4D56810E8E0E8090.png?w=640\" alt=\"\" data-recalc-dims=\"1\"\/>\n\t\t\t<\/p>\n<\/li>\n<li><span style=\"font-family:\ub9d1\uc740 \uace0\ub515; font-size:10pt\">\uc874\uc7ac\uc5d0 \uc758\ud55c \uad00\uacc4 : &#8216;\uc18c\uc18d\ub41c\ub2e4&#8217;\ub77c\ub294 \uc758\ubbf8\ub294 \ud589\uc704\uc5d0 \ub530\ub978 \uc774\ubca4\ud2b8\uc5d0 \uc758\ud574 \ubc1c\uc0dd\ub418\ub294 \uc758\ubbf8\uac00 \uc544\ub2c8\uace0 \uadf8\ub0e5 \ud669\uacbd\ube48 \uc0ac\uc6d0\uc774 DB\ud300\uc5d0 \uc18c\uc18d\ub418\uc5b4 \uc788\uae30 \ub54c\ubb38\uc5d0 \ub098\ud0c0\ub098\ub294 \uc989 \uc874\uc7ac\uc758 \ud615\ud0dc\uc5d0 \uc758\ud574 \uad00\uacc4\uac00 \ud615\uc131\ub418\uc5b4 \uc788\ub294 \uac83\uc774\ub2e4.<\/span>\n\t\t<\/li>\n<li><span style=\"font-family:\ub9d1\uc740 \uace0\ub515; font-size:10pt\">\ud589\uc704\uc5d0 \uc758\ud55c \uad00\uacc4 : CTA201\uc774\ub77c\ub294 \uc8fc\ubb38\ubc88\ud638\ub97c \uc0dd\uc131\ud558\uc600\ub2e4. \uc8fc\ubb38 \uc5d4\ud2f0\ud2f0\uc758 CTA201 \uc8fc\ubb38\ubc88\ud638\ub294 \uae40\uacbd\uc7ac \uace0\uac1d\uc774 &#8216;\uc8fc\ubb38\ud55c\ub2e4&#8217;\ub77c\ub294 \ud589\uc704\uc5d0 \uc758\ud574 \ubc1c\uc0dd\ub418\uc5c8\uae30 \ub54c\ubb38\uc5d0 \ub450 \uc5d4\ud2f0\ud2f0 \uc0ac\uc774\uc758 \uad00\uacc4\ub294 \ud589\uc704\uc5d0 \uc758\ud55c \uad00\uacc4\uac00 \ub418\ub294 \uac83\uc774\ub2e4.<\/span>\n\t\t<\/li>\n<li>\n<div><span style=\"font-family:\ub9d1\uc740 \uace0\ub515; font-size:10pt\">\uad00\uacc4\uc758 \ud45c\uae30\ubc95<br \/>\n<\/span><\/div>\n<p><span style=\"font-family:\ub9d1\uc740 \uace0\ub515; font-size:10pt\">\uac00. \uad00\uacc4\uba85(Membership)<br \/>\n<\/span><\/p>\n<p><img src=\"https:\/\/i0.wp.com\/oracledba.zapto.org\/wordpress\/wp-content\/uploads\/1\/cfile4.uf.25450A3856810E8F2F1A48.png?w=640\" alt=\"\" data-recalc-dims=\"1\"\/>\n\t\t\t<\/p>\n<ul>\n<li><span style=\"font-family:\ub9d1\uc740 \uace0\ub515; font-size:10pt\">\uc5d4\ud2f0\ud2f0\uc5d0\uc11c \uad00\uacc4\uac00 \uc2dc\uc791\ub418\ub294 \ud3b8\uc744 \uad00\uacc4\uc2dc\uc791\uc810(The Beginning)\uc774\ub77c\uace0 \ubd80\ub974\uace0 \ubc1b\ub294 \ud3b8\uc744 \uad00\uacc4\ub05d\uc810(The End)\uc774\ub77c\uace0 \ubd80\ub978\ub2e4. \uad00\uacc4 \uc2dc\uc791\uc810\uacfc \ub05d\uc810 \ubaa8\ub450 \uad00\uacc4\uc774\ub984\uc744 \uac00\uc838\uc57c \ud558\uba70 \ucc38\uc5ec\uc790\uc758 \uad00\uc810\uc5d0 \ub530\ub77c \uad00\uacc4\uc774\ub984\uc774 \ub2a5\ub3d9\uc801(Active)\uc774\uac70\ub098 \uc218\ub3d9\uc801(Passive)\uc73c\ub85c \uba85\uba85\ub41c\ub2e4. \uad00\uacc4\uba85\uc740 \ub2e4\uc74c\uacfc \uac19\uc740 \uba85\uba85\uaddc\uce59\uc5d0 \ub530\ub77c \uc791\uc131\ud574\uc57c \ud55c\ub2e4.<\/span>\n\t\t\t\t<\/li>\n<li><span style=\"font-family:\ub9d1\uc740 \uace0\ub515; font-size:10pt\">\uc560\ub9e4\ud55c \ub3d9\uc0ac\ub97c \ud53c\ud55c\ub2e4. \uc608\ub97c \ub4e4\uba74 &#8216;\uad00\uacc4\ub41c\ub2e4&#8217;, &#8216;\uad00\ub828\uc774 \uc788\ub2e4&#8217;, &#8216;\uc774\ub2e4&#8217;, &#8216;\ud55c\ub2e4&#8217; \ub4f1\uc740 \uad6c\uccb4\uc801\uc774\uc9c0 \uc54a\uc544 \uc5b4\ub5a4 \ud589\uc704\uac00 \uc788\ub294\uc9c0 \ub610\ub294 \ub450 \ucc38\uc5ec\uc790\uac04 \uc5b4\ub5a4 \uc0c1\ud0dc\uac00 \uc874\uc7ac\ud558\ub294\uc9c0 \ud30c\uc545\ud560 \uc218 \uc5c6\ub2e4.<\/span>\n\t\t\t\t<\/li>\n<li><span style=\"font-family:\ub9d1\uc740 \uace0\ub515; font-size:10pt\">\ud604\uc7ac\ud615\uc73c\ub85c \ud45c\ud604\ud55c\ub2e4. \uc608\ub97c \ub4e4\uba74 &#8216;\uc218\uac15\uc744 \uc2e0\uccad\ud588\ub2e4&#8217;, &#8216;\uac15\uc758\ub97c \ud560 \uac83\uc774\ub2e4&#8217;\ub77c\ub294 \uc2dd\uc73c\ub85c \ud45c\ud604\ud574\uc11c\ub294 \uc548\ub41c\ub2e4. &#8216;\uc218\uac15 \uc2e0\uccad\ud55c\ub2e4&#8217;, &#8216;\uac15\uc758\ub97c \ud55c\ub2e4&#8217;\ub85c \ud45c\ud604\ud574\uc57c \ud55c\ub2e4.<\/span>\n\t\t\t\t<\/li>\n<\/ul>\n<p><span style=\"font-family:\ub9d1\uc740 \uace0\ub515; font-size:10pt\">\ub098. \uad00\uacc4\ucc28\uc218(Degree\/Cardinallity)<br \/>\n<\/span><\/p>\n<ul>\n<li><span style=\"font-family:\ub9d1\uc740 \uace0\ub515; font-size:10pt\">\uad00\uacc4\ucc28\uc218 : \ub450 \uac1c\uc758 \uc5d4\ud2f0\ud2f0\uac04 \uad00\uacc4\uc5d0\uc11c \ucc38\uc5ec\uc790\uc758 \uc218\ub97c \ud45c\ud604\ud558\ub294 \uac83<\/span>\n\t\t\t\t<\/li>\n<li><span style=\"font-family:\ub9d1\uc740 \uace0\ub515; font-size:10pt\">\uac00\uc7a5 \uc77c\ubc18\uc801\uc778 \uad00\uacc4\ucc28\uc218 \ud45c\ud604\ubc29\ubc95\uc740 1:M, 1:1, M:N<\/span>\n\t\t\t\t<\/li>\n<li><span style=\"font-family:\ub9d1\uc740 \uace0\ub515; font-size:10pt\">\ud55c \uac1c\uc758 \uad00\uacc4\uac00 \uc874\uc7ac\ud558\ub290\ub0d0 \uc544\ub2c8\uba74 \ub450 \uac1c \uc774\uc0c1\uc758 \uba64\ubc84\uc27d\uc774 \uc874\uc7ac\ud558\ub294\uc9c0\ub97c \ud30c\uc545\ud558\ub294 \uac83\uc774 \uc911\uc694<\/span>\n\t\t\t\t<\/li>\n<li><span style=\"font-family:\ub9d1\uc740 \uace0\ub515; font-size:10pt\">Crow`s Foot \ubaa8\ub378\uc5d0\uc11c\ub294 \ud55c \uac1c\uac00 \ucc38\uc5ec\ud558\ub294 \uacbd\uc6b0\ub294 \uc2e4\uc120\uc744, \ub2e4\uc218\uac00 \ucc38\uc5ec\ud55c \uacbd\uc6b0\ub294 \uae4c\ub9c8\uadc0\ubc1c\uacfc \uac19\uc740 \ubaa8\uc591\uc73c\ub85c \uadf8\ub824\uc90c<\/span>\n\t\t\t\t<\/li>\n<li>\n<div><span style=\"font-family:\ub9d1\uc740 \uace0\ub515; font-size:10pt\">1:1 \uad00\uacc4\ub97c \ud45c\uc2dc\ud558\ub294 \ubc29\ubc95<br \/>\n<\/span><\/div>\n<p><img src=\"https:\/\/i0.wp.com\/oracledba.zapto.org\/wordpress\/wp-content\/uploads\/1\/cfile29.uf.23464B3856810E903665AC.png?w=640\" alt=\"\" data-recalc-dims=\"1\"\/>\n\t\t\t\t\t<\/p>\n<\/li>\n<li>\n<div><span style=\"font-family:\ub9d1\uc740 \uace0\ub515; font-size:10pt\">1:M \uad00\uacc4\ub97c \ud45c\uc2dc\ud558\ub294 \ubc29\ubc95<br \/>\n<\/span><\/div>\n<p><img src=\"https:\/\/i0.wp.com\/oracledba.zapto.org\/wordpress\/wp-content\/uploads\/1\/cfile4.uf.240BC53C56810E93255931.png?w=640\" alt=\"\" data-recalc-dims=\"1\"\/>\n\t\t\t\t\t<\/p>\n<\/li>\n<li>\n<div><span style=\"font-family:\ub9d1\uc740 \uace0\ub515; font-size:10pt\">M:M \uad00\uacc4\ub97c \ud45c\uc2dc\ud558\ub294 \ubc29\ubc95<br \/>\n<\/span><\/div>\n<p><img src=\"https:\/\/i0.wp.com\/oracledba.zapto.org\/wordpress\/wp-content\/uploads\/1\/cfile7.uf.22610E4056810E951DE76F.png?w=640\" alt=\"\" data-recalc-dims=\"1\"\/>\n\t\t\t\t\t<\/p>\n<\/li>\n<li><span style=\"font-family:\ub9d1\uc740 \uace0\ub515; font-size:10pt\">M:N \uad00\uacc4\ub85c \ud45c\ud604\ub41c \ub370\uc774\ud130 \ubaa8\ub378\uc740 \uc774\ud6c4\uc5d0 \ub450 \uac1c\uc758 \uc8fc\uc2dd\ubcc4\uc790\ub97c \uc0c1\uc18d\ubc1b\uc740 \uad00\uacc4\uc5d4\ud2f0\ud2f0\ub97c \uc774\uc6a9\ud558\uc5ec 3\uac1c\uc758 \uc5d4\ud2f0\ud2f0\ub85c \uad6c\ubd84\ud558\uc5ec \ud45c\ud604\ud55c\ub2e4.<\/span>\n\t\t\t\t<\/li>\n<\/ul>\n<p><span style=\"font-family:\ub9d1\uc740 \uace0\ub515; font-size:10pt\">\ub2e4. \uad00\uacc4\uc120\ud0dd\uc0ac\uc591(Optionality)<br \/>\n<\/span><\/p>\n<p><img src=\"https:\/\/i0.wp.com\/oracledba.zapto.org\/wordpress\/wp-content\/uploads\/1\/cfile8.uf.245FCD4F56810E9523C403.png?w=640\" alt=\"\" data-recalc-dims=\"1\"\/>\n\t\t\t<\/p>\n<ul>\n<li><span style=\"font-family:\ub9d1\uc740 \uace0\ub515; font-size:10pt\">\ud544\uc218\uc5f0\uad00\uad00\uacc4 : \ucc38\uc5ec\ud558\ub294 \ubaa8\ub4e0 \ucc38\uc5ec\uc790\uac00 \ubc18\ub4dc\uc2dc \uad00\uacc4\ub97c \uac00\uc9c0\ub294, \ud0c0 \uc5d4\ud2f0\ud2f0\uc758 \ucc38\uc5ec\uc790\uc640 \uc5f0\uacb0\uc774 \ub418\uc5b4\uc57c \ud558\ub294 \uad00\uacc4. \uc608\ub97c \ub4e4\uba74 \uc8fc\ubb38\uc11c\ub294 \ubc18\ub4dc\uc2dc \uc8fc\ubb38\ubaa9\ub85d\uc744 \uac00\uc838\uc57c \ud558\uba70 \uc8fc\ubb38\ubaa9\ub85d\uc774 \uc5c6\ub294 \uc8fc\ubb38\uc11c\ub294 \uc758\ubbf8\uac00 \uc5c6\uc73c\ubbc0\ub85c \uc8fc\ubb38\uc11c\uc640 \uc8fc\ubb38\ubaa9\ub85d\uc740 \ud544\uc218\ucc38\uc5ec\uad00\uacc4\uac00 \ub418\ub294 \uac83\uc774\ub2e4.<\/span>\n\t\t\t\t<\/li>\n<li><span style=\"font-family:\ub9d1\uc740 \uace0\ub515; font-size:10pt\">\uc120\ud0dd\uc5f0\uad00\uad00\uacc4 : \uc704 \uc124\uba85\uc5d0\uc11c \ubaa9\ub85d\uc740 \uc8fc\ubb38\uc774 \ub420 \uc218\ub3c4 \uc788\uace0 \uc8fc\ubb38\uc774 \ub418\uc9c0 \uc54a\uc740 \ubaa9\ub85d\uc774 \uc788\uc744\uc218\ub3c4 \uc788\uc73c\ubbc0\ub85c \ubaa9\ub85d\uacfc \uc8fc\ubb38\ubaa9\ub85d\uacfc\uc758 \uad00\uacc4\ub294 \uc120\ud0dd\ucc38\uc5ec(Optional Membership)\uac00 \ub418\ub294 \uac83\uc774\ub2e4.<\/span>\n\t\t\t\t<\/li>\n<li><span style=\"font-family:\ub9d1\uc740 \uace0\ub515; font-size:10pt\">\uc120\ud0dd\ucc38\uc5ec\ub41c \ud56d\ubaa9\uc740 \ubb3c\ub9ac\uc18d\uc131\uc5d0\uc11c Foreign Key\ub85c \uc5f0\uacb0\ub420 \uacbd\uc6b0 Null\uc744 \ud5c8\uc6a9\ud560 \uc218 \uc788\ub294 \ud56d\ubaa9\uc774 \ub41c\ub2e4. \ub9cc\uc57d \uc120\ud0dd\ucc38\uc5ec\ub85c \uc9c0\uc815\ud574\uc57c\ud560 \uad00\uacc4\ub97c \ud544\uc218\ucc38\uc5ec\ub85c \uc798\ubabb \uc9c0\uc815\ud558\uba74 \uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc5d0\uc11c \ub370\uc774\ud130\uac00 \ubc1c\uc0dd\ud560 \ub54c \ubc18\ub4dc\uc2dc \ud55c \uac1c\uc758 \ud2b8\ub79c\uc7ad\uc158\uc73c\ub85c \uc81c\uc5b4\ud574\uc57c \ud558\ub294 \uc81c\uc57d\uc0ac\ud56d\uc774 \uc0dd\uae30\ubbc0\ub85c \uc720\uc758\ud574\uc57c \ud568.<\/span>\n\t\t\t\t<\/li>\n<li>\n<div><span style=\"font-family:\ub9d1\uc740 \uace0\ub515; font-size:10pt\">\uc120\ud0dd\ucc38\uc5ec\uad00\uacc4\ub294 ERD\uc5d0\uc11c \uad00\uacc4\ub97c \ub098\ud0c0\ub0b4\ub294 \uc120\uc5d0\uc11c \uc120\ud0dd\ucc38\uc5ec\ud558\ub294 \uc5d4\ud2f0\ud2f0 \ucabd\uc744 \uc6d0\uc73c\ub85c \ud45c\uc2dc\ud55c\ub2e4. \ud544\uc218 \ucc38\uc5ec\ub294 \uc544\ubb34\ub7f0 \ud45c\uc2dc\ub97c \ud558\uc9c0 \uc54a\ub294\ub2e4.<\/span>\n\t\t\t\t\t<\/div>\n<p><img src=\"https:\/\/i0.wp.com\/oracledba.zapto.org\/wordpress\/wp-content\/uploads\/1\/cfile4.uf.2471793856810E960CDD15.png?w=640\" alt=\"\" data-recalc-dims=\"1\"\/>\n\t\t\t\t\t<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<li>\n<div><span style=\"font-family:\ub9d1\uc740 \uace0\ub515; font-size:10pt\">\uad00\uacc4\uc758 \uc815\uc758 \ubc0f \uc77d\ub294 \ubc29\ubc95<br \/>\n<\/span><\/div>\n<p><span style=\"font-family:\ub9d1\uc740 \uace0\ub515; font-size:10pt\">\uac00. \uad00\uacc4 \uccb4\ud06c\uc0ac\ud56d<br \/>\n<\/span><\/p>\n<ul>\n<li><span style=\"font-family:\ub9d1\uc740 \uace0\ub515; font-size:10pt\">\ub450 \uac1c\uc758 \uc5d4\ud2f0\ud2f0 \uc0ac\uc774\uc5d0 \uad00\uc2ec\uc788\ub294 \uc5f0\uad00\uaddc\uce59\uc774 \uc874\uc7ac\ud558\ub294\uac00?<\/span>\n\t\t\t\t<\/li>\n<li><span style=\"font-family:\ub9d1\uc740 \uace0\ub515; font-size:10pt\">\ub450 \uac1c\uc758 \uc5d4\ud2f0\ud2f0 \uc0ac\uc774\uc5d0 \uc815\ubcf4\uc758 \uc870\ud569\uc774 \ubc1c\uc0dd\ub418\ub294\uac00?<\/span>\n\t\t\t\t<\/li>\n<li><span style=\"font-family:\ub9d1\uc740 \uace0\ub515; font-size:10pt\">\uc5c5\ubb34\uae30\uc220\uc11c, \uc7a5\ud45c\uc5d0 \uad00\uacc4\uc5f0\uacb0\uc5d0 \ub300\ud55c \uaddc\uce59\uc774 \uc11c\uc220\ub418\uc5b4 \uc788\ub294\uac00?<\/span>\n\t\t\t\t<\/li>\n<li><span style=\"font-family:\ub9d1\uc740 \uace0\ub515; font-size:10pt\">\uc5c5\ubb34\uae30\uc220\uc11c, \uc7a5\ud45c\uc5d0 \uad00\uacc4\uc5f0\uacb0\uc744 \uac00\ub2a5\ud558\uac8c \ud558\ub294 \ub3d9\uc0ac(Verb)\uac00 \uc788\ub294\uac00?<\/span>\n\t\t\t\t<\/li>\n<\/ul>\n<p><span style=\"font-family:\ub9d1\uc740 \uace0\ub515; font-size:10pt\">\ub098. \uad00\uacc4 \uc77d\uae30<br \/>\n<\/span><\/p>\n<ul>\n<li><span style=\"font-family:\ub9d1\uc740 \uace0\ub515; font-size:10pt\">\uae30\uc900(Source) \uc5d4\ud2f0\ud2f0\ub97c \ud55c \uac1c(One) \ub610\ub294 \uac01(Each)\uc73c\ub85c \uc77d\ub294\ub2e4.<\/span>\n\t\t\t\t<\/li>\n<li><span style=\"font-family:\ub9d1\uc740 \uace0\ub515; 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