Izinto ezi-5 eziQalayo kufuneka zikwazi malunga neenkcukacha

Iingcebiso zokwenza Ukusebenza ngeenkcukacha zolwazi

Idatha ehlelwe kwifomathi ethile ingaqwalaselwa njengesiseko sedatha. Kukho izicelo ezininzi zeenkcukacha zolwazi kwaye zisetyenziswe phantse yonke inkqubo kunye nenkonzo egcina okanye ifumana ulwazi.

Ukuba usanda kuqalisa ngeenkcukacha zolwazi, ngezantsi kuluhlu lwezinto eziphezulu omele wazi ngaphambi kokuba uqhubeke phambili. Ezi zinyaniso ziqinisekisiwe ukwenza kube lula ukusebenza kunye neenkcukacha zolwazi kunye nokwandisa umveliso.

01 ngo 05

I-SQL iFom i-Basic Core of Database

Tetra Izithombe / Getty Izithombe

Awukwazi ukuwuphepha: uLwimi loKuHlola oluHlangeneyo luyifumene nomxholo wazo zonke iinkcukacha zolwazi. Inika i-interface ye-Oracle, i-SQL Server, iMicrosoft Access, kunye nezinye iinkcukacha zolwazi, kwaye "kufuneka ufunde" kubo bonke abasebenzisi beenkcukacha ezifunayo.

Thatha i-SQL inkomfa phambi kokuba uzame ukufunda nayiphi na isofthiwe ye-database. Ixesha lotyalo-mali luza kukunceda ukuba wakhe isiseko esifanelekileyo kwaye uqalise kwiinyawo ezichanekileyo kwihlabathi leenkcukacha.

IW3Schools.com yindawo enkulu yokuqala yabaqalayo abanomdla kwi-SQL. Kaninzi "

02 we 05

Ukukhetha iiKeyona zaseprayimari Isigqibo esibaluleke kakhulu

Ukukhethwa kweprayimari ebalulekileyo kuyona yezona zibalulekileyo zigqibo oza kuzenza ekwenzeni i-database entsha. Umqobo obaluleke kakhulu kukuba kufuneka uqinisekise ukuba ukhiye okhethiweyo uhlukile.

Ukuba kunokwenzeka ukuba iirekhodi ezimbini (zangaphambili, ezikhoyo, okanye ezizayo) zingabelana ngexabiso elifanayo kwi-attribute, lukhetho olungundoqo oluphambili. Xa uvavanya le ngxaki, kufuneka ucinge ngobuchule.

Kuya kufuneka kwakhona ukuba ugweme izithethe ezibucayi eziphakamisa iingxaki zobumfihlo, njengeeNombolo zoKhuseleko lweNtlalo.

Ukufumana ulwazi oluthe xaxa ekukhetheni ukona oluphambili olubalulekileyo, khangela Ukukhetha IsiCwangciso sePrayimari .

03 we 05

I-NULL Ayinayo i-Zero okanye i-String String

I-NULL iyona xabiso ekhethekileyo kwihlabathi leenkcukacha zolwazi, kodwa yinto ethile abaqalayo abaye badibanisa ngayo.

Xa ubona ixabiso le-NULL, liguqule ngokuthi "lingaziwa." Ukuba ubuninzi be-NULL, oko akuthethi ukuba ityero. Ngokufanayo, ukuba intsimi yesicatshulwa ibamba ixabiso le-NULL , akuthethi ukuba akukho xabiso elifanelekileyo-lingaziwa nje.

Umzekelo, qwalasela ulwazi oluqulethe ulwazi malunga nabantwana abaya esikolweni esithile. Ukuba umntu ongena kwiirekhodi engazi iminyaka yobufundi, inani le-NULL lisetyenziselwa ukubonisa "indawo engaziwayo". Ngokuqinisekileyo umfundi uneminyaka yobudala-ayikho nje kwi-database.

04 we 05

Ukuguqula amaSpredishithi kwiiNgcaciso Zisindisa ixesha

Ukuba sele sele unetoni yolwazi egcinwe kwi-Microsoft Excel okanye enye ifomathi yespredishithi, unokuzigcina uzintaba zexesha ngokuguqula ezo zipredishithi kwiitheyibhile zolwazi.

Funda isifundo sethu kwi-Converting Excel Spreadsheets ukufikelela kwiiNgcaciso zeSiseko ukuze uqalise.

05 we 05

Zonke ii-Platform zeDatabase azizange zenziwe ngokulinganayo

Kukho iinkcukacha ezininzi ezahlukeneyo ngaphandle, zonke ezo zinika iindidi ezahlukahlukeneyo kumaphu amanqaku ahlukeneyo.

Ezinye zizalisekile iinkcukacha zenkampani ezenzelwe ukufumana iimpahla ezinkulu zokugcina iinkcukacha ezikhonza amabhizinisi angamazwe ngamazwe. Ezinye ziyi-desktop zolwazi ezifanelekileyo ngokufanelekileyo ekulandeleni isitoreji esitolo esincinane kunye nabasebenzisi abodwa okanye ababini.

Iimfuno zezoshishino zakho ziya kululela isicwangciso esifanelekileyo seenkcukacha kwiimfuno zakho. Bona Iinkcukacha zeeNkqubo zeDeskithophu ukufumana ulwazi oluninzi, kunye noludweliso lwethu lwe- Free Online Database Abadali .