Video: Puas yog SQL yog ib hom lus tshaj tawm?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
SQL ntawv (Structured Query Lus ) yog a tshaj tawm nug lus thiab yog tus qauv kev lag luam rau kev sib txheeb databases. Tshaj tawm nug yam lus kuj tseem siv tau yooj yim dua li lawv tsuas yog tsom rau qhov yuav tsum tau rov qab thiab ua sai sai. Txawm li cas los xij, cov lus tshaj tawm muaj lawv tus kheej kev sib pauv.
Ib yam li ntawd, tib neeg nug, puas yog SQL lus txheej txheem lossis lus tshaj tawm?
SQL ntawv tsis yog a lus txheej txheem mas a lus tshaj tawm . Koj sau ib leeg xwb SQL ntawv tshaj tawm thiab xa mus rau DBMS. Lub DBMS ces executes internal code, uas yog muab zais los ntawm peb. Cov lus tshaj tawm ua rau ib nqe lus ntawm qhov xav tau.
Tom qab ntawd, lo lus nug yog, puas yog SQL suav ua lus programming? SQL ntawv (Structured Query Lus ) yog kev tswj database lus rau relational databases. SQL ntawv nws tus kheej yog tsis yog a programming lus , tab sis nws tus qauv tso cai tsim cov txheej txheem txuas ntxiv rau nws, uas txuas ntxiv mus rau kev ua haujlwm ntawm kev paub tab programming lus.
Ib yam li ib tug yuav nug, puas yog lus tshaj tawm?
Cov lus tshaj tawm , tseem hu ua nonprocedural lossis qib siab heev, yog programming yam lus nyob rau hauv uas (qhov zoo tshaj plaws) ib qho kev pab cuam qhia qhov yuav tsum tau ua es tsis yog yuav ua li cas.
Puas yog Java yog hom lus tshaj tawm?
Functional programming yog ib daim ntawv ntawm tshaj tawm programming. Nyob rau hauv sib piv, feem ntau mainstream yam lus , suav nrog cov phiaj xwm taw qhia (OOP) yam lus xws li C#, C++, thiab Java , tau tsim los txhawb nqa qhov tseem ceeb (procedural) programming.
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Puas yog lus tshaj tawm?
Cov lus tshaj tawm, tseem hu ua nonprocedural lossis qib siab heev, yog cov lus programming uas (tseem ceeb) ib txoj haujlwm qhia meej tias yuav tsum ua li cas es tsis yog yuav ua li cas