Cov txheej txheem:
Video: Cov lus nug ua haujlwm li cas hauv cov ntaub ntawv?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Lus nug pab koj nrhiav thiab ua haujlwm nrog koj cov ntaub ntawv
A nug tau los yog thov rau cov ntaub ntawv tau los ntawm koj database los yog rau kev nqis tes ua ntawm cov ntaub ntawv, los yog rau ob qho tib si. A nug tau muab lus teb rau koj rau ib lo lus nug yooj yim, ua kev suav, muab cov ntaub ntawv los ntawm cov rooj sib txawv, ntxiv, hloov, lossis tshem tawm cov ntaub ntawv los ntawm a database.
Hauv qhov no, dab tsi yog lus nug hauv database?
A nug yog kev thov rau cov ntaub ntawv lossis cov ntaub ntawv los ntawm a database rooj los yog ua ke ntawm rooj. Cov ntaub ntawv no yuav raug tsim tawm raws li cov txiaj ntsig xa rov qab los ntawm Structured Lus nug Lus (SQL) los yog raws li pictorials, graphs los yog complex tshwm sim, piv txwv li, sib txheeb xyuas los ntawm cov ntaub ntawv-tsim cov cuab yeej.
Ib yam li ntawd, vim li cas cov lus nug raug siv hauv cov ntaub ntawv? Lus nug tuaj yeem ua tiav ob peb txoj haujlwm sib txawv. Feem ntau, cov lus nug yog siv nrhiav cov ntaub ntawv tshwj xeeb los ntawm kev lim cov txheej txheem tshwj xeeb. Hauv kev sib raug zoo database , uas muaj cov ntaub ntawv los yog kab ntawm cov ntaub ntawv, SQL SELECT nqe lus nug tso cai rau tus neeg siv xaiv cov ntaub ntawv thiab xa rov qab los ntawm qhov database mus rau ib daim ntawv thov.
Ntawm no, dab tsi yog lus nug hauv database nrog piv txwv?
Lus nug los ntawm Piv txwv (QBE) a database query lus rau kev sib raug zoo databases . Nws tau tsim los ntawm Moshé M. Zloof ntawm IBM Kev Tshawb Fawb thaum nruab nrab xyoo 1970, nyob rau tib lub sijhawm rau kev txhim kho SQL. Nws yog thawj graphical nug lus, siv cov lus pom qhov twg tus neeg siv yuav nkag mus rau cov lus txib, piv txwv yam thiab tej yam kev mob.
Koj sau cov lus nug database li cas?
Koom nrog cov lus nug[edit]
- Nyem qhov Tsim Tab.
- Mus rau Lwm Pab Pawg.
- Nyem rau ntawm Query Design.
- Nyem rau ntawm lub rooj thiab tom qab ntawd ADD, ib zaug ib zaug.
- Xyuas kom cov rooj sib tham - muaj ib txoj kab koom nrog lawv.
- Nyem thiab luag cov teb los ntawm txhua lub rooj rau hauv cov lus nug.
- Nyem rau RUN.
Pom zoo:
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