. "Boyceho\u2013Coddova norm\u00E1ln\u00ED forma (BCNF) je jednou z norm\u00E1ln\u00EDch forem pou\u017E\u00EDvan\u00FDch p\u0159i normalizaci datab\u00E1ze. BCNF byla vytvo\u0159ena v roce 1974 a Edgarem Coddem, aby odstranila n\u011Bkter\u00E9 anom\u00E1lie, kter\u00E9 se vyskytuj\u00ED v relac\u00EDch, kter\u00E9 jsou ve 3NF. Chris Date upozornil, \u017Ee definice BCNF se prvn\u011B objevila v \u010Dl\u00E1nku od Ian-a Heath-a u\u017E v roce 1971."@cs . . "Boyceho\u2013Coddova norm\u00E1ln\u00ED forma (BCNF) je jednou z norm\u00E1ln\u00EDch forem pou\u017E\u00EDvan\u00FDch p\u0159i normalizaci datab\u00E1ze. BCNF byla vytvo\u0159ena v roce 1974 a Edgarem Coddem, aby odstranila n\u011Bkter\u00E9 anom\u00E1lie, kter\u00E9 se vyskytuj\u00ED v relac\u00EDch, kter\u00E9 jsou ve 3NF. Chris Date upozornil, \u017Ee definice BCNF se prvn\u011B objevila v \u010Dl\u00E1nku od Ian-a Heath-a u\u017E v roce 1971. Definice BCNF: Relace R je v BCNF tehdy a jen tehdy, kdy\u017E pro ka\u017Edou netrivi\u00E1ln\u00ED z\u00E1vislost X \u2192 Y, kde X a Y jsou mno\u017Einy atribut\u016F a z\u00E1rove\u0148 Y nen\u00ED podmno\u017Einou X, plat\u00ED, \u017Ee X je nadmno\u017Einou n\u011Bjak\u00E9ho kl\u00ED\u010De, nebo X je kl\u00ED\u010Dem relace R. Jinak \u0159e\u010Deno relace R je v BCNF tehdy a jen tehdy, kdy\u017E ka\u017Ed\u00FD determinant funk\u010Dn\u00ED z\u00E1vislosti v relaci R je z\u00E1rove\u0148 kandid\u00E1tn\u00EDm kl\u00ED\u010Dem relace R."@cs . . . "\uBCF4\uC774\uC2A4-\uCF54\uB4DC \uC815\uADDC\uD654 \uB610\uB294 BCNF \uC815\uADDC\uD654\uB780 Boyce-Codd Normal Form\uC758 \uC57D\uC790\uB85C\uC11C, 1974\uB144 Raymond Boyce\uC640 Edgar Codd\uAC00 \uB9CC\uB4E0 \uB370\uC774\uD130\uBCA0\uC774\uC2A4 \uC815\uADDC\uD654 \uD615\uC2DD\uC744 \uB9D0\uD55C\uB2E4. \uAD00\uACC4\uD615 \uB370\uC774\uD130\uBCA0\uC774\uC2A4\uC758 \uB9B4\uB808\uC774\uC158 R\uC5D0\uC11C \uD568\uC218 \uC885\uC18D\uC131 X\u2192Y\uAC00 \uC131\uB9BD\uD560 \uB54C, \uBAA8\uB4E0 \uACB0\uC815\uC790 X\uAC00 \uD6C4\uBCF4\uD0A4\uC774\uBA74 BCNF \uC815\uADDC\uD615\uC774 \uB41C\uB2E4. \uC989, \uC2DD\uBCC4\uC790\uB85C \uC4F0\uC774\uB294 \uC18D\uC131\uC774 \uC77C\uBC18\uC18D\uC131\uC5D0 \uC885\uC18D\uB418\uC9C0 \uC54A\uC544\uC57C \uD55C\uB2E4. \uC81C3\uC815\uADDC\uD654\uB97C \uD1B5\uD574\uC11C\uB3C4 \uC81C\uAC70\uB418\uC9C0 \uC54A\uC740 \uB370\uC774\uD130\uC758 \uC911\uBCF5 \uBB38\uC81C\uB97C \uD574\uACB0\uD574 \uC8FC\uAE30 \uB54C\uBB38\uC5D0 \uC77C\uBA85 \u2018\uC81C3.5\uC815\uADDC\uD654\u2019\uB77C\uACE0\uB3C4 \uBD80\uB978\uB2E4."@ko . . "Boyce\u2013Codd normal form (or BCNF or 3.5NF) is a normal form used in database normalization. It is a slightly stronger version of the third normal form (3NF). BCNF was developed in 1974 by Raymond F. Boyce and Edgar F. Codd to address certain types of anomalies not dealt with by 3NF as originally defined. \n* X \u2192 Y is a trivial functional dependency (Y \u2286 X), \n* X is a superkey for schema R."@en . . . . . . . "La Forma Normal de Boyce-Codd (o FNBC) es una forma normal utilizada en la normalizaci\u00F3n de bases de datos. Es una versi\u00F3n ligeramente m\u00E1s fuerte de la Tercera forma normal (3FN).\u200B La forma normal de -Codd requiere que no existan dependencias funcionales no triviales de los atributos que no sean un conjunto de la clave candidata. En una tabla en 3FN, todos los atributos dependen de una clave, de la clave completa y de ninguna otra cosa excepto de la clave (excluyendo dependencias triviales, como ).Se dice que una tabla est\u00E1 en FNBC si y solo si est\u00E1 en 3FN y cada dependencia funcional no trivial tiene una clave candidata como determinante. En t\u00E9rminos menos formales, una tabla est\u00E1 en FNBC si est\u00E1 en 3FN y los \u00FAnicos determinantes son claves candidatas."@es . "Boyce-Codd\u8303\u5F0F\uFF08\u82F1\u8A9E\uFF1ABoyce-Codd normal form\uFF0C\u7F29\u5199BCNF\uFF09\uFF0C\u662F\u6570\u636E\u5E93\u89C4\u8303\u5316\u7684\u4E00\u79CD\u6B63\u89C4\u5F62\u5F0F\u3002\u662F\u5728\u7B2C\u4E09\u8303\u5F0F\u7684\u57FA\u7840\u4E0A\u52A0\u4E0A\u7A0D\u5FAE\u66F4\u4E25\u683C\u7EA6\u675F\uFF0C\u6BCF\u4E2ABCNF\u5173\u7CFB\u9700\u6EE1\u8DB3\u7B2C\u4E09\u8303\u5F0F\u3002BCNF\u53BB\u9664\u4E86\u5C5E\u6027\u95F4\u7684\u4E0D\u5FC5\u8981\u7684\u51FD\u6570\u4F9D\u8D56\u3002 BCNF\u7684\u5B9A\u4E49\u662F\uFF1A \u5982\u679C\u5BF9\u4E8ER\u4E2D\u5B58\u5728\u7684\u4EFB\u610F\u4E00\u4E2A\u975E\u5E73\u51E1\u51FD\u6570\u4F9D\u8D56X->A\uFF0C\u90FD\u6EE1\u8DB3X\u662FR\u7684\u4E00\u4E2A\u8D85\u952E\uFF0C\u90A3\u4E48\u5173\u7CFB\u6A21\u5F0FR\u5C31\u5C5E\u4E8EBCNF\u3002 \u5BF9\u4E0A\u8FF0\u5B9A\u4E49\uFF0C\u53EF\u4EE5\u7406\u89E3\u4E3A\uFF1A\u5E73\u51E1\u51FD\u6570\u4F9D\u8D56\u5173\u7CFB\u662F\u6307\uFF0C\u5982\u679C\u5C5E\u6027\u96C6\u5408X\u5305\u542B\u4E86\u5C5E\u6027\u96C6\u5408A\uFF0C\u90A3\u4E48\u5C31\u4E00\u5B9A\u6709X->A\uFF1B\u8D85\u952E\u662F\u6307\u80FD\u591F\u552F\u4E00\u786E\u5B9A\u8868\u4E2D\u5404\u884C\u7684\u5C5E\u6027\u96C6\u5408\uFF0C\u56E0\u6B64\u4E00\u4E2A\u8D85\u952E\u7684\u6700\u5C0F\u5316\u5C31\u662F\u4E00\u4E2A\u5019\u9078\u9375\uFF1BBCNF\u662F\u8BF4\uFF0C\u5982\u679C\u4E00\u4E2A\u5C5E\u6027\u96C6\u5408X\u80FD\u201C\u4E0D\u5E73\u51E1\u201D\u5730\u63A8\u5BFC\u51FA\u53E6\u4E00\u4E2A\u5C5E\u6027\u96C6\u5408A\uFF0C\u800C\u4E14X\u8FD8\u4E0D\u80FD\u552F\u4E00\u533A\u5206\u8868\u7684\u5404\u884C\uFF0C\u90A3\u4E48\u8FD9\u4E2A\u8868\u4E2D\u4E00\u5B9A\u5305\u542B\u4E86\u4E00\u4E9B\u5197\u4F59\u4FE1\u606F\u3002 BCNF\u4E0E\u7B2C\u4E09\u8303\u5F0F\u7684\u4E0D\u540C\u4E4B\u5904\u5728\u4E8E\uFF1A\u7B2C\u4E09\u8303\u5F0F\u4E2D\u4E0D\u5141\u8BB8\u88AB\u53E6\u4E00\u4E2A\u975E\u4E3B\u5C5E\u6027\u51B3\u5B9A\uFF0C\u4F46\u7B2C\u4E09\u8303\u5F0F\u5141\u8BB8\u4E3B\u5C5E\u6027\u88AB\u975E\u4E3B\u5C5E\u6027\u51B3\u5B9A\uFF1B\u800C\u5728BCNF\u4E2D\uFF0C\u4EFB\u4F55\u5C5E\u6027\uFF08\u5305\u62EC\u975E\u4E3B\u5C5E\u6027\u548C\u4E3B\u5C5E\u6027\uFF09\u90FD\u4E0D\u80FD\u88AB\u975E\u4E3B\u5C5E\u6027\u6240\u51B3\u5B9A\u3002 \u4EFB\u4F55\u4E00\u4E2ABCNF\u5FC5\u7136\u6EE1\u8DB3\uFF1A \n* \u6240\u6709\u975E\u4E3B\u5C5E\u6027\u90FD\u5B8C\u5168\u51FD\u6570\u4F9D\u8D56\u4E8E\u6BCF\u4E2A\u5019\u9009\u952E \n* \u6240\u6709\u4E3B\u5C5E\u6027\u90FD\u5B8C\u5168\u51FD\u6570\u4F9D\u8D56\u4E8E\u6BCF\u4E2A\u4E0D\u5305\u542B\u5B83\u7684\u5019\u9009\u952E \n* \u6CA1\u6709\u4EFB\u4F55\u5C5E\u6027\u5B8C\u5168\u51FD\u6570\u4F9D\u8D56\u4E8E\u975E\u5019\u9009\u952E\u7684\u4EFB\u4F55\u4E00\u7EC4\u5C5E\u6027"@zh . . "\uBCF4\uC774\uC2A4-\uCF54\uB4DC \uC815\uADDC\uD654 \uB610\uB294 BCNF \uC815\uADDC\uD654\uB780 Boyce-Codd Normal Form\uC758 \uC57D\uC790\uB85C\uC11C, 1974\uB144 Raymond Boyce\uC640 Edgar Codd\uAC00 \uB9CC\uB4E0 \uB370\uC774\uD130\uBCA0\uC774\uC2A4 \uC815\uADDC\uD654 \uD615\uC2DD\uC744 \uB9D0\uD55C\uB2E4. \uAD00\uACC4\uD615 \uB370\uC774\uD130\uBCA0\uC774\uC2A4\uC758 \uB9B4\uB808\uC774\uC158 R\uC5D0\uC11C \uD568\uC218 \uC885\uC18D\uC131 X\u2192Y\uAC00 \uC131\uB9BD\uD560 \uB54C, \uBAA8\uB4E0 \uACB0\uC815\uC790 X\uAC00 \uD6C4\uBCF4\uD0A4\uC774\uBA74 BCNF \uC815\uADDC\uD615\uC774 \uB41C\uB2E4. \uC989, \uC2DD\uBCC4\uC790\uB85C \uC4F0\uC774\uB294 \uC18D\uC131\uC774 \uC77C\uBC18\uC18D\uC131\uC5D0 \uC885\uC18D\uB418\uC9C0 \uC54A\uC544\uC57C \uD55C\uB2E4. \uC81C3\uC815\uADDC\uD654\uB97C \uD1B5\uD574\uC11C\uB3C4 \uC81C\uAC70\uB418\uC9C0 \uC54A\uC740 \uB370\uC774\uD130\uC758 \uC911\uBCF5 \uBB38\uC81C\uB97C \uD574\uACB0\uD574 \uC8FC\uAE30 \uB54C\uBB38\uC5D0 \uC77C\uBA85 \u2018\uC81C3.5\uC815\uADDC\uD654\u2019\uB77C\uACE0\uB3C4 \uBD80\uB978\uB2E4."@ko . . . "\uBCF4\uC774\uC2A4-\uCF54\uB4DC \uC815\uADDC\uD654"@ko . . . . . . . . . "\u041D\u043E\u0440\u043C\u0430\u043B\u044C\u043D\u0430\u044F \u0444\u043E\u0440\u043C\u0430 \u0411\u043E\u0439\u0441\u0430 \u2014 \u041A\u043E\u0434\u0434\u0430 (\u0441\u043E\u043A\u0440\u0430\u0449\u0451\u043D\u043D\u043E BCNF \u043E\u0442 \u0430\u043D\u0433\u043B. Boyce\u2013Codd normal form) \u2014 \u043E\u0434\u043D\u0430 \u0438\u0437 \u0432\u043E\u0437\u043C\u043E\u0436\u043D\u044B\u0445 \u043D\u043E\u0440\u043C\u0430\u043B\u044C\u043D\u044B\u0445 \u0444\u043E\u0440\u043C \u043E\u0442\u043D\u043E\u0448\u0435\u043D\u0438\u044F \u0432 \u0440\u0435\u043B\u044F\u0446\u0438\u043E\u043D\u043D\u043E\u0439 \u043C\u043E\u0434\u0435\u043B\u0438 \u0434\u0430\u043D\u043D\u044B\u0445. \u0418\u043D\u043E\u0433\u0434\u0430 \u043D\u043E\u0440\u043C\u0430\u043B\u044C\u043D\u0443\u044E \u0444\u043E\u0440\u043C\u0443 \u0411\u043E\u0439\u0441\u0430 \u2014 \u041A\u043E\u0434\u0434\u0430 \u043D\u0430\u0437\u044B\u0432\u0430\u044E\u0442 \u0443\u0441\u0438\u043B\u0435\u043D\u043D\u043E\u0439 \u0442\u0440\u0435\u0442\u044C\u0435\u0439 \u043D\u043E\u0440\u043C\u0430\u043B\u044C\u043D\u043E\u0439 \u0444\u043E\u0440\u043C\u043E\u0439, \u043F\u043E\u0441\u043A\u043E\u043B\u044C\u043A\u0443 \u043E\u043D\u0430 \u0432\u043E \u0432\u0441\u0435\u0445 \u043E\u0442\u043D\u043E\u0448\u0435\u043D\u0438\u044F\u0445 \u0441\u0438\u043B\u044C\u043D\u0435\u0435 (\u0441\u0442\u0440\u043E\u0436\u0435) \u043F\u043E \u0441\u0440\u0430\u0432\u043D\u0435\u043D\u0438\u044E \u0441 \u0440\u0430\u043D\u0435\u0435 \u043E\u043F\u0440\u0435\u0434\u0435\u043B\u0451\u043D\u043D\u043E\u0439 3\u041D\u0424."@ru . . "1108885978"^^ . . . . . . "\u041D\u043E\u0440\u043C\u0430\u043B\u044C\u043D\u0430\u044F \u0444\u043E\u0440\u043C\u0430 \u0411\u043E\u0439\u0441\u0430 \u2014 \u041A\u043E\u0434\u0434\u0430"@ru . "Boyceho\u2013Coddova norm\u00E1ln\u00ED forma"@cs . . . . "3850023"^^ . . "Boyce\u2013Codd normal form (or BCNF or 3.5NF) is a normal form used in database normalization. It is a slightly stronger version of the third normal form (3NF). BCNF was developed in 1974 by Raymond F. Boyce and Edgar F. Codd to address certain types of anomalies not dealt with by 3NF as originally defined. If a relational schema is in BCNF then all redundancy based on functional dependency has been removed, although other types of redundancy may still exist. A relational schema R is in Boyce\u2013Codd normal form if and only if for every one of its dependencies X \u2192 Y, at least one of the following conditions hold: \n* X \u2192 Y is a trivial functional dependency (Y \u2286 X), \n* X is a superkey for schema R."@en . . . . . "12990"^^ . "\u041D\u043E\u0440\u043C\u0430\u043B\u044C\u043D\u0430\u044F \u0444\u043E\u0440\u043C\u0430 \u0411\u043E\u0439\u0441\u0430 \u2014 \u041A\u043E\u0434\u0434\u0430 (\u0441\u043E\u043A\u0440\u0430\u0449\u0451\u043D\u043D\u043E BCNF \u043E\u0442 \u0430\u043D\u0433\u043B. Boyce\u2013Codd normal form) \u2014 \u043E\u0434\u043D\u0430 \u0438\u0437 \u0432\u043E\u0437\u043C\u043E\u0436\u043D\u044B\u0445 \u043D\u043E\u0440\u043C\u0430\u043B\u044C\u043D\u044B\u0445 \u0444\u043E\u0440\u043C \u043E\u0442\u043D\u043E\u0448\u0435\u043D\u0438\u044F \u0432 \u0440\u0435\u043B\u044F\u0446\u0438\u043E\u043D\u043D\u043E\u0439 \u043C\u043E\u0434\u0435\u043B\u0438 \u0434\u0430\u043D\u043D\u044B\u0445. \u0418\u043D\u043E\u0433\u0434\u0430 \u043D\u043E\u0440\u043C\u0430\u043B\u044C\u043D\u0443\u044E \u0444\u043E\u0440\u043C\u0443 \u0411\u043E\u0439\u0441\u0430 \u2014 \u041A\u043E\u0434\u0434\u0430 \u043D\u0430\u0437\u044B\u0432\u0430\u044E\u0442 \u0443\u0441\u0438\u043B\u0435\u043D\u043D\u043E\u0439 \u0442\u0440\u0435\u0442\u044C\u0435\u0439 \u043D\u043E\u0440\u043C\u0430\u043B\u044C\u043D\u043E\u0439 \u0444\u043E\u0440\u043C\u043E\u0439, \u043F\u043E\u0441\u043A\u043E\u043B\u044C\u043A\u0443 \u043E\u043D\u0430 \u0432\u043E \u0432\u0441\u0435\u0445 \u043E\u0442\u043D\u043E\u0448\u0435\u043D\u0438\u044F\u0445 \u0441\u0438\u043B\u044C\u043D\u0435\u0435 (\u0441\u0442\u0440\u043E\u0436\u0435) \u043F\u043E \u0441\u0440\u0430\u0432\u043D\u0435\u043D\u0438\u044E \u0441 \u0440\u0430\u043D\u0435\u0435 \u043E\u043F\u0440\u0435\u0434\u0435\u043B\u0451\u043D\u043D\u043E\u0439 3\u041D\u0424. \u041D\u0430\u0437\u0432\u0430\u043D\u0430 \u0432 \u0447\u0435\u0441\u0442\u044C \u0420\u044D\u044F \u0411\u043E\u0439\u0441\u0430 \u0438 \u042D\u0434\u0433\u0430\u0440\u0430 \u041A\u043E\u0434\u0434\u0430, \u0445\u043E\u0442\u044F \u041A\u0440\u0438\u0441\u0442\u043E\u0444\u0435\u0440 \u0414\u0435\u0439\u0442 \u0443\u043A\u0430\u0437\u044B\u0432\u0430\u0435\u0442, \u0447\u0442\u043E \u043D\u0430 \u0441\u0430\u043C\u043E\u043C \u0434\u0435\u043B\u0435 \u0441\u0442\u0440\u043E\u0433\u043E\u0435 \u043E\u043F\u0440\u0435\u0434\u0435\u043B\u0435\u043D\u0438\u0435 \u00AB\u0442\u0440\u0435\u0442\u044C\u0435\u0439\u00BB \u043D\u043E\u0440\u043C\u0430\u043B\u044C\u043D\u043E\u0439 \u0444\u043E\u0440\u043C\u044B, \u044D\u043A\u0432\u0438\u0432\u0430\u043B\u0435\u043D\u0442\u043D\u043E\u0435 \u043E\u043F\u0440\u0435\u0434\u0435\u043B\u0435\u043D\u0438\u044E \u043D\u043E\u0440\u043C\u0430\u043B\u044C\u043D\u043E\u0439 \u0444\u043E\u0440\u043C\u044B \u0411\u043E\u0439\u0441\u0430 \u2014 \u041A\u043E\u0434\u0434\u0430, \u0432\u043F\u0435\u0440\u0432\u044B\u0435 \u0431\u044B\u043B\u043E \u0434\u0430\u043D\u043E \u0418\u044D\u043D\u043E\u043C \u0425\u0438\u0442\u043E\u043C (\u0430\u043D\u0433\u043B. Ian Heath) \u0432 1971 \u0433\u043E\u0434\u0443, \u043F\u043E\u044D\u0442\u043E\u043C\u0443 \u0434\u0430\u043D\u043D\u0443\u044E \u0444\u043E\u0440\u043C\u0443 \u0441\u043B\u0435\u0434\u043E\u0432\u0430\u043B\u043E \u0431\u044B \u043D\u0430\u0437\u044B\u0432\u0430\u0442\u044C \u00AB\u043D\u043E\u0440\u043C\u0430\u043B\u044C\u043D\u043E\u0439 \u0444\u043E\u0440\u043C\u043E\u0439 \u0425\u0438\u0442\u0430\u00BB."@ru . "\u041D\u043E\u0440\u043C\u0430\u043B\u044C\u043D\u0430 \u0444\u043E\u0440\u043C\u0430 \u0411\u043E\u0439\u0441\u0430 \u2014 \u041A\u043E\u0434\u0434\u0430"@uk . . "Boyce-Codd\u8303\u5F0F\uFF08\u82F1\u8A9E\uFF1ABoyce-Codd normal form\uFF0C\u7F29\u5199BCNF\uFF09\uFF0C\u662F\u6570\u636E\u5E93\u89C4\u8303\u5316\u7684\u4E00\u79CD\u6B63\u89C4\u5F62\u5F0F\u3002\u662F\u5728\u7B2C\u4E09\u8303\u5F0F\u7684\u57FA\u7840\u4E0A\u52A0\u4E0A\u7A0D\u5FAE\u66F4\u4E25\u683C\u7EA6\u675F\uFF0C\u6BCF\u4E2ABCNF\u5173\u7CFB\u9700\u6EE1\u8DB3\u7B2C\u4E09\u8303\u5F0F\u3002BCNF\u53BB\u9664\u4E86\u5C5E\u6027\u95F4\u7684\u4E0D\u5FC5\u8981\u7684\u51FD\u6570\u4F9D\u8D56\u3002 BCNF\u7684\u5B9A\u4E49\u662F\uFF1A \u5982\u679C\u5BF9\u4E8ER\u4E2D\u5B58\u5728\u7684\u4EFB\u610F\u4E00\u4E2A\u975E\u5E73\u51E1\u51FD\u6570\u4F9D\u8D56X->A\uFF0C\u90FD\u6EE1\u8DB3X\u662FR\u7684\u4E00\u4E2A\u8D85\u952E\uFF0C\u90A3\u4E48\u5173\u7CFB\u6A21\u5F0FR\u5C31\u5C5E\u4E8EBCNF\u3002 \u5BF9\u4E0A\u8FF0\u5B9A\u4E49\uFF0C\u53EF\u4EE5\u7406\u89E3\u4E3A\uFF1A\u5E73\u51E1\u51FD\u6570\u4F9D\u8D56\u5173\u7CFB\u662F\u6307\uFF0C\u5982\u679C\u5C5E\u6027\u96C6\u5408X\u5305\u542B\u4E86\u5C5E\u6027\u96C6\u5408A\uFF0C\u90A3\u4E48\u5C31\u4E00\u5B9A\u6709X->A\uFF1B\u8D85\u952E\u662F\u6307\u80FD\u591F\u552F\u4E00\u786E\u5B9A\u8868\u4E2D\u5404\u884C\u7684\u5C5E\u6027\u96C6\u5408\uFF0C\u56E0\u6B64\u4E00\u4E2A\u8D85\u952E\u7684\u6700\u5C0F\u5316\u5C31\u662F\u4E00\u4E2A\u5019\u9078\u9375\uFF1BBCNF\u662F\u8BF4\uFF0C\u5982\u679C\u4E00\u4E2A\u5C5E\u6027\u96C6\u5408X\u80FD\u201C\u4E0D\u5E73\u51E1\u201D\u5730\u63A8\u5BFC\u51FA\u53E6\u4E00\u4E2A\u5C5E\u6027\u96C6\u5408A\uFF0C\u800C\u4E14X\u8FD8\u4E0D\u80FD\u552F\u4E00\u533A\u5206\u8868\u7684\u5404\u884C\uFF0C\u90A3\u4E48\u8FD9\u4E2A\u8868\u4E2D\u4E00\u5B9A\u5305\u542B\u4E86\u4E00\u4E9B\u5197\u4F59\u4FE1\u606F\u3002 BCNF\u4E0E\u7B2C\u4E09\u8303\u5F0F\u7684\u4E0D\u540C\u4E4B\u5904\u5728\u4E8E\uFF1A\u7B2C\u4E09\u8303\u5F0F\u4E2D\u4E0D\u5141\u8BB8\u88AB\u53E6\u4E00\u4E2A\u975E\u4E3B\u5C5E\u6027\u51B3\u5B9A\uFF0C\u4F46\u7B2C\u4E09\u8303\u5F0F\u5141\u8BB8\u4E3B\u5C5E\u6027\u88AB\u975E\u4E3B\u5C5E\u6027\u51B3\u5B9A\uFF1B\u800C\u5728BCNF\u4E2D\uFF0C\u4EFB\u4F55\u5C5E\u6027\uFF08\u5305\u62EC\u975E\u4E3B\u5C5E\u6027\u548C\u4E3B\u5C5E\u6027\uFF09\u90FD\u4E0D\u80FD\u88AB\u975E\u4E3B\u5C5E\u6027\u6240\u51B3\u5B9A\u3002 \u4EFB\u4F55\u4E00\u4E2ABCNF\u5FC5\u7136\u6EE1\u8DB3\uFF1A \n* \u6240\u6709\u975E\u4E3B\u5C5E\u6027\u90FD\u5B8C\u5168\u51FD\u6570\u4F9D\u8D56\u4E8E\u6BCF\u4E2A\u5019\u9009\u952E \n* \u6240\u6709\u4E3B\u5C5E\u6027\u90FD\u5B8C\u5168\u51FD\u6570\u4F9D\u8D56\u4E8E\u6BCF\u4E2A\u4E0D\u5305\u542B\u5B83\u7684\u5019\u9009\u952E \n* \u6CA1\u6709\u4EFB\u4F55\u5C5E\u6027\u5B8C\u5168\u51FD\u6570\u4F9D\u8D56\u4E8E\u975E\u5019\u9009\u952E\u7684\u4EFB\u4F55\u4E00\u7EC4\u5C5E\u6027"@zh . "Forma normal de Boyce-Codd"@es . . "Boyce\u2013Codd normal form"@en . . . . . . "BC\u6B63\u898F\u5F62\u5F0F"@zh . "La Forma Normal de Boyce-Codd (o FNBC) es una forma normal utilizada en la normalizaci\u00F3n de bases de datos. Es una versi\u00F3n ligeramente m\u00E1s fuerte de la Tercera forma normal (3FN).\u200B La forma normal de -Codd requiere que no existan dependencias funcionales no triviales de los atributos que no sean un conjunto de la clave candidata. En una tabla en 3FN, todos los atributos dependen de una clave, de la clave completa y de ninguna otra cosa excepto de la clave (excluyendo dependencias triviales, como ).Se dice que una tabla est\u00E1 en FNBC si y solo si est\u00E1 en 3FN y cada dependencia funcional no trivial tiene una clave candidata como determinante. En t\u00E9rminos menos formales, una tabla est\u00E1 en FNBC si est\u00E1 en 3FN y los \u00FAnicos determinantes son claves candidatas."@es . "Boyce-Codd-Normalform"@de . "\u041D\u043E\u0440\u043C\u0430\u043B\u044C\u043D\u0430 \u0444\u043E\u0440\u043C\u0430 \u0411\u043E\u0439\u0441\u0430 \u2014 \u041A\u043E\u0434\u0434\u0430 (\u0430\u0431\u043E \u041D\u0424\u0411\u041A, \u0430\u0431\u043E \u0411\u041A\u041D\u041D\u0424, \u0430\u0431\u043E 3.5\u041D\u0424) \u2014 \u043D\u043E\u0440\u043C\u0430\u043B\u044C\u043D\u0430 \u0444\u043E\u0440\u043C\u0430 \u0432\u0438\u043A\u043E\u0440\u0438\u0441\u0442\u043E\u0432\u043D\u0430 \u0432 \u043D\u043E\u0440\u043C\u0430\u043B\u0456\u0437\u0430\u0446\u0456\u0457 \u0431\u0430\u0437 \u0434\u0430\u043D\u0438\u0445. \u0426\u0435 \u0442\u0440\u043E\u0448\u043A\u0438 \u0441\u0438\u043B\u044C\u043D\u0456\u0448\u0430 \u0432\u0435\u0440\u0441\u0456\u044F \u0442\u0440\u0435\u0442\u044C\u043E\u0457 \u043D\u043E\u0440\u043C\u0430\u043B\u044C\u043D\u043E\u0457 \u0444\u043E\u0440\u043C\u0438 (3\u041D\u0424). \u0422\u0430\u0431\u043B\u0438\u0446\u044F \u0437\u043D\u0430\u0445\u043E\u0434\u0438\u0442\u044C\u0441\u044F \u0432 \u041D\u0424\u0411\u041A \u0442\u043E\u0434\u0456 \u0456 \u0442\u0456\u043B\u044C\u043A\u0438 \u0442\u043E\u0434\u0456, \u043A\u043E\u043B\u0438 \u0434\u043B\u044F \u043A\u043E\u0436\u043D\u043E\u0457 \u0457\u0457 \u043D\u0435\u0442\u0440\u0438\u0432\u0456\u0430\u043B\u044C\u043D\u043E\u0457 \u0444\u0443\u043D\u043A\u0446\u0456\u043E\u043D\u0430\u043B\u044C\u043D\u043E\u0457 \u0437\u0430\u043B\u0435\u0436\u043D\u043E\u0441\u0442\u0456 X \u2192 Y, X \u0446\u0435 \u0441\u0443\u043F\u0435\u0440\u043A\u043B\u044E\u0447 \u2014 \u0442\u043E\u0431\u0442\u043E, X \u0430\u0431\u043E \u043F\u043E\u0442\u0435\u043D\u0446\u0456\u0439\u043D\u0438\u0439 \u043A\u043B\u044E\u0447, \u0430\u0431\u043E \u0439\u043E\u0433\u043E \u043D\u0430\u0434\u043C\u043D\u043E\u0436\u0438\u043D\u0430. \u041D\u0424\u0411\u041A \u0431\u0443\u043B\u0430 \u0432\u0456\u0434\u043D\u0430\u0439\u0434\u0435\u043D\u0430 \u0432 1974 \u0456 \u0415\u0434\u0433\u0430\u0440\u043E\u043C \u041A\u043E\u0434\u0434\u043E\u043C \u0447\u0435\u0440\u0435\u0437 \u0434\u0435\u044F\u043A\u0456 \u0442\u0438\u043F\u0438 \u0430\u043D\u043E\u043C\u0430\u043B\u0456\u0439 \u0437 \u044F\u043A\u0438\u043C\u0438 \u043D\u0435 \u0441\u043F\u0440\u0430\u0446\u044C\u043E\u0432\u0443\u0432\u0430\u043B\u0430 3\u041D\u0424 \u044F\u043A \u0431\u0443\u043B\u043E \u0437\u0430\u044F\u0432\u043B\u0435\u043D\u043E. \u041A\u0440\u0456\u0441\u0442\u043E\u0444\u0435\u0440 \u0414\u0435\u0439\u0442 \u0432\u043A\u0430\u0437\u0430\u0432, \u0449\u043E \u0432\u0438\u0437\u043D\u0430\u0447\u0435\u043D\u043D\u044F \u0442\u043E\u0433\u043E, \u0449\u043E \u043C\u0438 \u0437\u043D\u0430\u0454\u043C\u043E \u044F\u043A \u041D\u0424\u0411\u041A, \u0432 1971 \u043E\u043F\u0443\u0431\u043B\u0456\u043A\u0443\u0432\u0430\u0432 \u042F\u043D \u0425\u0456\u0442. \u0414\u0435\u0439\u0442 \u043F\u0438\u0441\u0430\u0432:"@uk . . . . 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