Qee lub sij hawm SQL yog tus yam ntxwv tsis yog txheej txheem vim cov lus txheej txheem feem ntau xav tau cov ntsiab lus ntawm kev ua haujlwm kom tau teev tseg, xws li qhib thiab kaw cov rooj, thauj khoom thiab tshawb xyuas cov ntsuas, lossis yaug cov buffers thiab sau cov ntaub ntawv rau filesystems. … Cov Ntaub Ntawv Query Language (DQL)
Dab tsi ua rau SQL ib yam lus tsis yog txheej txheem?
SQL yog ib qho yooj yim heev, tsis tau muaj zog, database nkag tau lus. SQL yog hom lus tsis yog txheej txheem; cov neeg siv piav qhia hauv SQL lawv xav ua dab tsi, thiab SQL lus compiler cia li tsim tus txheej txheem rautaw qhia cov ntaub ntawv thiab ua cov haujlwm xav tau. … SQL nqe lus.
Vim li cas SQL yog ib hom lus?
DEFINITION Structured Query Language (SQL) yog programming lus tsim los kom tau txais cov ntaub ntawv tawm ntawm thiab muab tso rau hauv kev sib raug zoo database. … Nws yog nyob ntawm kev tswj hwm cov ntaub ntawv los txheeb xyuas cov lus nug tawm tsam nws tus kheej cov qauv thiab txheeb xyuas seb nws yuav tsum ua haujlwm li cas txhawm rau khaws cov ntaub ntawv.
Vim li cas SQL hu ua lus piav qhia nrog piv txwv?
Structured Query Language lossis SQL, yog programming nomenclature siv los ua haujlwm (xws li kev sib koom ua ke, sib tshuam, thiab rho tawm) los npaj thiab khaws cov ntaub ntawv hauv kev sib raug zoo databases, raws li "Set theory and relational algebra." Hauv txhua qhov system uas siv SQL, "cov ntaub ntawv ntsiab lus lossis cov cwj pwm, categorized rau hauv kab, …
Yog SQL ib qho kev tshaj tawmlus?
SQL (Structured Query Language) yog a lus nug lus nugthiab yog tus qauv kev lag luam rau kev sib raug zoo databases. … Cov lus nug tshaj tawm kuj siv tau yooj yim dua vim lawv tsuas tsom rau yam uas yuav tsum tau muab rov qab thiab ua sai sai.
