Indlela Ukwakha database futhi okungukuthi SQL?

Nehaba, database kuyinto ibhuku lezinto. Lesi sakamuva kungaba, isibonelo, zokupheka, telucingo, imoto izinombolo kanye namafayela. Ngokuvamile, noma yiziphi izinto kokuba izici ezifanayo, kanye nezincazelo ezahlukene.

izici ezinjalo zibizwa ngokuthi ama-database Amasimu (isibonelo, igama lokugcina noma ngonyaka ukwethulwa isakhiwo ukusebenza). Amasimu into yakha ekhadini, okuyinto (noma iqembu kubo), ungathatha kwezinye izinhlelo zokwenziwayo.

Yolwazi sivumele ukucubungula izindodla Imininingwane masinya ngesikhathi sangempela. Lokhu kubaluleke kakhulu kuleli zwe lanamuhla, njengoba inani idatha sanda futhi kudingeka izindlela eliphezulu ukusebenza ukucubungula nesilondoloze. By the way, isitoreji nokwethembeka - enye inzuzo izinhlelo ezinjalo.

Kanjani ukwakha semininingwane?

Lokhu kuzodinga ukuthuthukiswa umqondo walo. Kufanele zihlanganisa emasimini ukhiye - incazelo lezinto kanye nohlu izindlela edingekayo ukuze kusetshenziswe. Ngenxa yalokho, afakwa isizinda futhi kuchazwe amathuluzi lezo zinhlelo. Izindlela idatha kuncike kushuba bo kambaphambili Amasimu. Indlela Ukwakha database futhi angawutholi "isisindo abafileyo"? Ukuze wenze lokhu, musa weqa ukuhlela kanye nomklamo. I sobala unjiniyela uyaqonda lokho anakho ukubhekana nomsebenzi elingenazinkinga kuyoba umkhiqizo osuphelile.

Futhi lokhu bethanda sobala kuphela. Kanjani? Dala imininingo egciniwe, unga nje "phezu kwedolo!" Udinga ngokushesha baqala liqalise futhi ulisebenzise! Konke lokhu - amaphutha ejwayelekile, lapho ke kuholele ekulahlekeni noma ukulahlekelwa esinqunyiwe idatha, futhi lokhu akufanele kube. "Ubani ophethe ulwazi - ungumnikazi emhlabeni", - uthe zo.

izinhlobo Simple yolwazi kakade yisikhathi. Basebenza kahle njengoba izincwadi iselula noma ukusiza ukugcina irekhodi izincwadi zakho ozithandayo. Ukuze ibhizinisi lesimanje ukuthi akwanele.

Ukugcwaliseka kwazo Umnotho wanamuhla usitshela zidinga izigidi ngokushesha ukuphathwa semininingwane Amasimu. Lokhu yokukhokha futhi izingcaphuno isitokwe, futhi eziningi izinto, lihamba phambili. Nokho, ukufinyelela yolwazi kumele kwenziwe ngokushesha, ngokushelela futhi inqwaba abasebenzisi.

Kuze kube yimanje, ukuthuthukisa amazinga nezilimi izinhlelo for yolwazi, ezifana SQL. Ulimi Lokusebenza Oluhlelekile - ngakho-ke lokhu isifinyezo imele, isibe standard emkhakheni yokugcinwa kokwaziswa nokucutshungulwa.

ngenxa yokuthandwa kwayo, ingaphansi luyisisusa esinamandla. Ulimi inikeza ithuba kakhulu ngemva kokuthinta noma yisiphi isibalo eyinkimbinkimbi ngokungadingekile idatha. SQL ikuvumela ukudala basakaza semininingwane zingubudlelwane ngokufinyelela ngesikhathi esisodwa inombolo omkhulu wabasebenzisi, kuhlanganise - izinhlelo kanye amarobhothi.

Kodwa inzuzo enkulu yiyona ukuthembeka ulimi. It wakha okuningi esebenzisa ukubethela kolwazi, ukugawulwa kwamahlathi ayo futhi isipele. Shono SQL-egciniwe esetshenziswa ezempi kanye zobuchwepheshe umkhakha.

Indlela ukudala database SQL? Lokhu kuzodinga ukuletha idatha kuhambisana namazinga ulimi. Lokhu kuhilela ukuthayipha emikhakheni ethile kanye namalungelo ukufinyelela kuwo. In ukubuya, unjiniyela uthola ithuluzi elinamandla umsebenzi, futhi umnikazi idatha ungaqiniseka yobuqotho babo.

Ngo yesimanje control izinhlelo, futhi isitoreji zonke ophuthumayo umbuzo idatha: "Indlela yokwenza semininingwane uvikelekile futhi ukuqinisekisa ukusebenza elingenazinkinga?". Lokhu bazibandakanye hhayi kuphela abantu, kodwa ukwehlukana lonke ehamba phambili Onjiniyela software. Kube Standardization uhlelo, izincazelo kanye nokwaziswa yokuphepha. Ochwepheshe abafanelekayo njalo ukuze bathuthukise amakhono abo futhi ukusekela izitifiketi zabo zakwamanye amazwe.