lus nug (QL) yog hais txog txhua lub khoos phis tawj programming lus uas thov thiab khaws cov ntaub ntawv los ntawm cov ntaub ntawv thiab cov ntaub ntawv xov xwm los ntawm kev xa cov lus nugNws ua haujlwm ntawm cov neeg siv nkag mus hauv cov txheej txheem thiab kev ua haujlwm raws li cov lus txib. queries nrhiav thiab rho tawm cov ntaub ntawv los ntawm host databases.
Qhia lus piv txwv yog dab tsi?
Cov lus nug, cov lus nug cov ntaub ntawv lossis cov lus nug database (DQLs) yog cov lus hauv computer siv los ua cov lus nug hauv databases thiab cov ntaub ntawv xov xwm. Ib qho piv txwv uas paub zoo yog the Structured Query Language (SQL).
hom lus nug sib txawv yog dab tsi?
Tsib hom SQL queries yog 1) Cov Lus Txhais Lus (DDL) 2) Cov Ntaub Ntawv Siv Lus (DML) 3) Cov Ntaub Ntawv Tswj Cov Lus (DCL) 4) Kev Tswj Lag Luam (TCL) thiab, 5) Cov Lus Nug Cov Lus (DQL)
Qhov twg yog lus nug zoo tshaj?
A list of 8 nrov databases
- Oracle 12c. Nws tsis yog qhov xav tsis thoob tias Oracle yog qhov tsis tu ncua ntawm cov npe nrov databases. …
- MySQL. MySQL yog ib qho ntawm cov ntaub ntawv nrov tshaj plaws rau kev siv web-based. …
- Microsoft SQL Server. …
- PostgreSQL. …
- MongoDB. …
- MariaDB. …
- DB2. …
- SAP HANA.
Ob hom lus nug yog dab tsi?
Ob hom lus nug muaj, cov lus nug snapshot thiab cov lus nug txuas ntxiv.
