Yenza i-SQL Foreign Key

Ukuba ujonge ukufunda Yenza i-SQL Foreign Key, ufikile⁢ kwindawo eyiyo. Isitshixo sangaphandle kwi-SQL yintsimi okanye isethi yemihlaba kwitheyibhile enye ebonisa iqhosha eliphambili kwenye itafile. Oku kwenza kube lula ukuseka ubudlelwane phakathi kweetheyibhile zombini, okuyimfuneko ukugcina ingqibelelo yedatha kwisiseko sedatha yobudlelwane. Okulandelayo, siya kukubonisa indlela yokwenza isitshixo sangaphandle kwi-SQL ngendlela elula nesebenzayo.

-Inyathelo ngenyathelo ➡️ Yenza isitshixo sangaphandle seSQL

• Inyathelo lesi-1: Okokuqala, ngaphambi kokudala i-iqhosha langaphandle⁤ kwi-SQL, kubalulekile ukuchonga ⁢iitheyibhile kunye neekholamu eziza kudityaniswa.
• Inyathelo lesi-2: ⁢Xa iitheyibhile kunye nemigca ichongiwe, isitshixo sangaphandle siyenziwa ⁢sebenzisa lo myalelo ulandelayo weSQL: ELTER ITABLE [itheyibhile_indawo] YONGEZELA ISIQINISEKISO ‍ [yangaphandle_isitshixo_igama] ⁢ ISIQINISO SANGAPHANDLE ([ikholamu_yekholamu]) IREFERENCES [itheyibhile_yomthombo]([umthombo_ikholamu]);
• Inyathelo lesi-3: ⁤ Kubalulekile ukuqinisekisa ukuba idatha kwikholamu yesitshixo sangaphandle ihambelana nedatha kwikholamu yereferensi.
• Inyathelo lesi-4: Ukuba kuyimfuneko, amagatya anje XA KUCINYWA kwaye KUHLAZIYWA ⁣ ukuxela ukuziphatha kwesitshixo ⁤ sangaphandle xa irekhodi elikwitheyibhile yomthombo icinyiwe okanye ihlaziywa.
• Inyathelo lesi-5: Ekugqibeleni, xa isitshixo sangaphandle senziwe, ubukho balo bunokuqinisekiswa ngokusebenzisa umyalelo BONISA YENZA ITAFILE [igama_letafile];

Imibuzo neempendulo

Yintoni isitshixo sangaphandle kwi-SQL?

1. Isitshixo sangaphandle ngu a⁤ indawo⁢ kwitafile ‍ enxulumene nesitshixo esiphambili⁤ senye itheyibhile.
2. Isetyenziselwa ukuseka ⁤ubudlelwane phakathi kweetheyibhile ezimbini ⁢kwisiseko sedatha esinxulumeneyo.

Kutheni kubalulekile ukwenza isitshixo sangaphandle kwi-SQL?

1. Isitshixo sangaphandle siqinisekisa intembeko yedatha phakathi kweetafile.
2. Ivumela⁢ ukugcina ukungaguquguquki kwedatha kwaye unqande iingxaki ezinje ngedatha yeenkedama okanye ukungangqinelani.

Usenza njani isitshixo sangaphandle kwiSQL?

1. Okokuqala, chonga indawo eya kusebenza njengesitshixo sangaphandle kwitheyibhile.
2. Emva koko, khankanya itafile kunye⁤indawo⁤eyakuthi iqhosha langaphandle⁤ireferensi.
3. Okokugqibela, sebenzisa ingxelo ye-ALTER TABLE ukongeza isitshixo sangaphandle kwitafile.

Yintoni isivakalisi sokwenza isitshixo sangaphandle kwiSQL?

1. TSHINTSHA ITHEYIBHILE_Igama_letafile
2. YONGEZELA UMTHETHO_Isitshixo_igama LAMANYE AMAZWE (uluhlu) IIREFERENCES ereferensi_itheyibhile(ikholamu_ereferelweyo);

Zeziphi iingenelo usebenzisa izitshixo angaphandle SQL inikeza?

1. Ukuphucula imfezeko kunye nokungaguquguquki kwedatha kwiziko ledatha.
2. Iququzelela ukugcinwa kwedatha ngokuphepha ukuphindaphinda kwedatha kunye neempazamo zeereferensi.

Ngaba izitshixo zangaphandle zinokulungiswa okanye zicinywe kwiSQL?

1. Ewe, izitshixo zangaphandle zinokuguqulwa okanye zicinywe kusetyenziswa i-ALTER TABLE statement.
2. Ukulungisa iqhosha langaphandle, usebenzisa i DROP statement uze wongeze iqhosha elitsha langaphandle ngolungelelwaniso olutsha.

Zichongwa njani izitshixo zangaphandle kwitafile yeSQL?

1. Unokuchonga izitshixo zangaphandle kwitheyibhile ngokubonisana nenkcazo yetheyibhile kwinkqubo yolawulo lwedatha.
2. Inkcazo iya kubonisa izitshixo zangaphandle kunye negama labo, indawo ehambelana nayo, kunye netafile ekhankanyiweyo.

Ngaba kuyenzeka ukwenza isitshixo sangaphandle esalatha kwiindawo ezininzi⁢ kwenye itafile?

1. Ewe, kuyenzeka ukwenza isitshixo sangaphandle esikhomba⁤ kwiindawo ezininzi kwenye itafile.
2. Kufuneka uchaze isitshixo sangaphandle⁣ usebenzisa uluhlu lwangaphandle⁢ kwireferensi kwitheyibhile ereferensi.

Kwenzeka ntoni ukuba ndizama ukongeza isitshixo sangaphandle esibhekisa kwindawo engekhoyo kwenye itafile?

1. Umsebenzi wokudala isitshixo sangaphandle uya kusilela kwaye ubonise umyalezo wemposiso ochaza ukuba indawo ekhankanyiweyo ayikho kwitheyibhile ekhankanyiweyo.
2. Kuya kufuneka uqinisekise ukuba indawo obhekisa kuyo ikhona kwitafile ngaphambi kokuba udale isitshixo sangaphandle.

Ngaba ndingenza isitshixo sangaphandle kwitafile engenanto kwiSQL?

1. Ewe, ungenza⁢ a⁤ isitshixo sangaphandle⁤ kwitafile engenanto.
2. Ubukho bedatha kwitheyibhile abuchaphazeli ukudalwa kwesitshixo sangaphandle.

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