Cov txheej txheem:
- Advanced Topics
- Head First SQL (yog tias koj yog tus pib, thawj txoj hauv kev yog ib txoj hauv kev zoo tshaj plaws los kawm SQL)
- Feem ntau siv SQL Queries, nrog rau cov piv txwv
Video: Cov lus nug siab heev yog dab tsi?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Cov lus nug Advanced yog ib feem ntawm txhua tus thawj tswj hwm database lossis tus tsim tawm txoj haujlwm. Cov lus nug Advanced feem ntau yog siv rau kev tshaj tawm, koom nrog ntau lub rooj, ua zes lus nug , thiab kev lag luam xauv.
Ib yam li ntawd, cov ntsiab lus SQL advanced yog dab tsi?
Advanced Topics
- Muaj nuj nqi, khaws cia cov txheej txheem, pob.
- Pivoting data: CAS & PIVOT syntax.
- Cov lus nug Hierarchical.
- Cursors: Implicit thiab meej.
- Ua rau.
- Dynamic SQL.
- Materialized Views.
- Query Optimization: Index.
Ib sab saum toj no, cov lus nug thiab hom lus nug yog dab tsi? Xaiv, Ua, Parameter thiab Aggregate: Lus nug yog cov cuab yeej muaj txiaj ntsig zoo thaum nws los txog rau cov ntaub ntawv thiab lawv feem ntau hu los ntawm tus neeg siv los ntawm ib daim ntawv. Hmoov zoo rau peb, Microsoft Access tso cai rau ntau yam hom lus nug , qee qhov tseem ceeb yog xaiv, ua, parameter thiab aggregate lus nug.
Kuj kom paub yog, Kuv yuav kawm li cas SQL lus nug?
Head First SQL (yog tias koj yog tus pib, thawj txoj hauv kev yog ib txoj hauv kev zoo tshaj plaws los kawm SQL)
- W3Schools – “SQL Tutorial”
- Vertabelo Academy.
- Codecademy - Kawm SQL
- Khan Academy – “Intro to SQL”
- SQLZoo.
- Tutorials Point – “Kawm SQL”
- Udacity – “Intro to Relational Databases”
- SQL Teeb meem thiab kev daws teeb meem.
Cov lus nug SQL feem ntau yog dab tsi?
Feem ntau siv SQL Queries, nrog rau cov piv txwv
- Tsim. CREATE cov lus nug yog siv los tsim cov ntaub ntawv tshiab lossis rooj.
- ALTER. ALTER cov lus nug yog siv los hloov kho cov qauv ntawm cov ntaub ntawv lossis lub rooj xws li ntxiv ib kab tshiab, hloov cov ntaub ntawv hom, poob, lossis hloov npe rau kab uas twb muaj lawm, thiab lwm yam.
- DROP. DROP cov lus nug yog siv los rho tawm cov ntaub ntawv lossis cov lus.
- TRUNCATE.
Pom zoo:
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