Indlela ukudala ledatha yaye oko SQL?

Ngendlela ebaxiweyo, database ikhathalogu bezinto. Le yokugqibela kungaba, umzekelo, iiresiphi, izintlu ngomnxeba, amanani imoto kunye neefayili. Ngokubanzi, naziphi na izixhobo iimpawu ezifanayo, kunye neentsingiselo ezahlukeneyo.

iimpawu ezinjalo ibizwa database amasimi (umzekelo, igama lokugqibela okanye nyaka intshayelelo kwesakhiwo ukusebenza). Amasimi yenjongosenzi yakha ikhadi, apho (okanye iqela kwabo), ungakwazi ukuthatha ezinye izenzo.

Zolwazi kuvumela ukwenza imali enkulu yolwazi ngokukhawuleza nangobuchule ngexesha lenene. Oku kubaluleke kakhulu ehlabathini namhlanje, njengoko ixabiso lwedata olukhulayo rhoqo kwaye kufuneka iindlela ophezulu ukusebenza processing kunye nokugcinwa. Hi ndlela leyi, ukugcinwa kunye nokuthembeka - enye inzuzo iinkqubo ezinjalo.

Indlela ukwakha uvimba?

Oku kuya kufuna ukuphuhliswa ingqiqo yayo. Lo msebenzi mawubandakanye amasimi ezingundoqo - inkcazo yezinto kunye noluhlu iindlela ezifunekayo ukuze iqwalaselwe. Ngako oko, le ekujongwe isiseko kunye sasicacisa nezixhobo ezilungiselelwe umiliselo. Iindlela data kuxhomekeke kubunzima kunye ephambili namasimi abo. Indlela ukudala uvimba kwaye ungafumani "ubunzima ufile '? Ukuze wenze oku, musa ukutsiba ucwangciso kunye noyilo. I sicace umphuhlisi uyakuqonda oko anako ukujongana umsebenzi inkathazo-free iya kuba imveliso ogqityiweyo.

Kwaye oku kuphela yiyo ibonakale. Njani? Yenza database, wena umane "kwi Guqani!" Kufuneka ngoko nangoko kuqalisa ukuphumeza kulusebenzisa! Konke oku - iimpazamo ezithile, ngoko kungakhokelela ekulahlekeni okanye ukulahleka kwenxalenye data, kwaye oku kumele kube. "Ngubani na ophethe ulwazi - uphethe ihlabathi," - wathi zo.

iintlobo ezilula Oovimba sele kuphelelwa. Zisebenza kakuhle nje iincwadi ngeselula okanye ukunceda ugcine irekhodi iincwadi zakho ozithandayo. Kuba ishishini mihla oko akwanelanga.

Izinto ezenzeka yezoqoqosho yanamhlanje ifuna yokuphatha izigidi ngoko nangoko namasimi ledatha. Le billing, kunye Iiquotes, kwaye zininzi izinto komgomo. Noko ke, ukufikelela kwiziseko zedata kufuneka kwenziwe ngokukhawuleza, ngokulula kwaye inani elikhulu labasebenzisi.

Ukuza kuthi ga ngoku, ukuphuhlisa imigangatho kunye iilwimi lwenkqubo yolwazi, ezifana SQL. Ingxaki yokwakhiwa kolwimi - ngoko oku isishunqulelo imela, liye laba umgangatho endle ukugcinwa kwedata kanye processing.

udumo yalo phantsi izizathu ezixhasa. Ulwimi inika ithuba kakhulu lokusingatha naliphi na inani zintsonkothe ngokwesigqibo esicalanye data. SQL ikuvumela ukuba ukudala uvimba ezinobume zahanjiswa, kunye ukufikelela ngaxeshanye inani elikhulu abasebenzisi, kubandakanywa - iinkqubo kunye iirobhothi.

Kodwa ke ukugqithisela engundoqo ukuthembeka ulwimi. It wakha lukhulu ngendlela khowudi lolwazi, ukugawulwa kwalo backup. Akumangalisi ke SQL-sedata esetyenziswa kwishishini zomkhosi eliphezulu-zobugcisa.

Indlela ukwakha uvimba SQL? Oku kuya kufuna ukuba bazise iinkcukacha ngokuthobela kunye nemigangatho ulwimi. Oku kubandakanya okubhalela amasimi ezithile kunye namalungelo ukufikelela kubo. Imbuyekezo, umphuhlisi uyalinandipha isixhobo esinamandla umsebenzi, kwaye umnini data sinokuqiniseka ingqibelelo yabo.

Kwiinkqubo zolawulo mihla, kunye nokugcinwa kwazo zonke ongxamisekileyo umbuzo data: "Indlela yokwenza uvimba kukhuseleke nokuqinisekisa ukusebenza inkathazo-simahla?". Oku ababandakanyekayo nje kuphela abantu, kodwa amaqela yonke eziphambili abaphuhlisi software. Kukho inkqubo yokubeka emgangathweni, iinkcazelo kunye nokhuseleko ulwazi. ziingcali njalo ekuphuculeni izakhono zabo nokuxhasa izatifikethi zabo ngamazwe.