Cov txheej txheem:
- Muaj tsib hom SQL Commands uas tuaj yeem faib ua:
- SQL cov ntaub ntawv hom tuaj yeem muab faib ua ntau pawg hauv qab no
Video: Dab tsi yog hom hauv SQL Server?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
SQL Server cov ntaub ntawv hom Txheej txheem cej luam
Hauv SQL Server , ib kem, sib txawv, thiab parameter tuav tus nqi uas cuam tshuam nrog a hom , los yog tseem hu ua cov ntaub ntawv hom . Ib cov ntaub ntawv hom yog tus cwj pwm uas qhia txog qhov hom ntawm cov ntaub ntawv uas cov khoom no khaws tau. Nws tuaj yeem yog tus lej, cim kab, nyiaj txiag, hnub thiab sijhawm, thiab lwm yam.
Tsis tas li ntawd, dab tsi yog hom hauv SQL?
Muaj tsib hom SQL Commands uas tuaj yeem faib ua:
- DDL (Data txhais lus).
- DML (Data Manipulation Language).
- DQL (Data Query Language).
- DCL (Data Control Language).
- TCL (Kev Tswj Kev Lag Luam).
5 hom ntaub ntawv yog dab tsi? Hom ntaub ntawv uas muaj xws li:
- Tus lej.
- Floating point tooj.
- Cim.
- Txoj hlua.
- Boolean.
Xav txog qhov no, dab tsi yog hom ntaub ntawv hauv SQL Server?
SQL cov ntaub ntawv hom tuaj yeem muab faib ua ntau pawg hauv qab no
- Cov ntaub ntawv naj npawb xws li int, tinyint, bigint, ntab, tiag thiab lwm yam.
- Hnub tim thiab Lub Sijhawm cov ntaub ntawv xws li Hnub, Lub Sijhawm, Hnub Tim thiab lwm yam.
- Cim thiab hlua cov ntaub ntawv hom xws li char, varchar, ntawv nyeem thiab lwm yam.
Dab tsi yog cov neeg siv txhais hom hauv SQL?
Cov neeg siv - txhais cov ntaub ntawv hom yog nyob ntawm cov ntaub ntawv system hom hauv Microsoft SQL ntawv Server. Cov neeg siv - txhais cov ntaub ntawv hom tuaj yeem siv tau thaum ob peb lub rooj yuav tsum khaws tib yam hom ntawm cov ntaub ntawv nyob rau hauv ib kem thiab koj yuav tsum xyuas kom meej tias cov kab no muaj raws nraim tib cov ntaub ntawv hom , length, thiab NULLability.
Pom zoo:
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