Video: Boolean hauv MySQL yog dab tsi?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Kom nws yooj yim dua, MySQL muab BOOLEAN los yog BOOL raws li lub ntsiab lus ntawm TINYINT(1). Hauv MySQL , xoom yog suav tias yog cuav, thiab tsis yog xoom tus nqi yog suav tias yog qhov tseeb. Siv Boolean literals, koj siv cov constants TRUE thiab FALSE uas ntsuas rau 1 thiab 0 feem.
Tom qab ntawd, ib tus tuaj yeem nug, dab tsi yog Boolean cov ntaub ntawv hauv MySQL?
Bool , Boolean : Cov hom TINYINT (1). Tus nqi ntawm xoom yog suav tias yog cuav. Non-zero qhov tseem ceeb suav hais tias muaj tseeb. MySQL kuj hais tias: Peb npaj siab yuav ua kom tiav hom boolean tuav, inaccordance nrog tus qauv SQL, yav tom ntej MySQL tso tawm.
Qhov thib ob, yog Tinyint yog Boolean? 5 Teb. MySQL tsis muaj nyob hauv boolean hom ntaub ntawv. Nws siv tus lej tsawg tshaj plaws cov ntaub ntawv hom - TINYINT . Qhov BOOLEAN thiab BOOL yog sib npaug ntawm TINYINT (1), vim lawv yog cov lus.
Tom qab ntawd, lo lus nug yog, dab tsi yog Boolean hauv database?
Boolean cov neeg ua haujlwm tsim lub hauv paus ntawm cov lej lej thiab database logic. Lawv txuas koj cov lus tshawb fawb ua ke kom nqaim lossis nthuav koj cov txiaj ntsig. Peb lub hauv paus boolean Cov neeg ua haujlwm yog: THIAB, LOSSIS, thiab TSIS TAU.
Tinyint 1 txhais li cas?
TINYINT Hom ntaub ntawv. A 1 -byte integer datatype siv hauv CREATE TABLE thiab ALTER TABLE nqe lus. Impalareturns tus nqi loj tshaj plaws los yog tsawg tshaj plaws nyob rau hauv ntau yam rau hom. Piv txwv li, qhov tseem ceeb siv tau rau a txii Qhov nruab nrab ntawm -128 mus rau 127. Hauv Impala, a txii nrog tus nqi ntawm -200 rov qab -128 dua li NULL.
Pom zoo:
Dab tsi yog hom ntaub ntawv khaws cia tus nqi Boolean?
Taw qhia rau PostgreSQL Boolean hom PostgreSQL siv ib byte rau khaws cia ib qho booleanvalue hauv cov ntaub ntawv. BOOLEAN tuaj yeem sau luv ua BOOL. Instandard SQL, tus nqi Boolean tuaj yeem yog TRUE, FALSE, lossis NULL
Yuav ua li cas yog ib tug txheej txheem nyob rau hauv lub operating system dab tsi yog ib tug xov nyob rau hauv lub operating system?
Ib tug txheej txheem, nyob rau hauv cov nqe lus yooj yim tshaj, yog ib tug executingprogram. Ib tug los yog ntau tshaj threads khiav nyob rau hauv cov ntsiab lus ntawm cov txheej txheem. Ib tug xov yog ib qho tseem ceeb chav tsev uas theoperating system faib lub sij hawm processor. Lub threadpool feem ntau yog siv los txo tus naj npawb ntawm cov ntaub ntawv thov thiab muab kev tswj hwm ntawm cov neeg ua haujlwm threads
Dab tsi yog txoj hauv kev virtual thiab txoj hauv lub cev hauv asp net?
Ua ntej tshaj, cia peb tau txais cov ntsiab lus ntawm ob qho tib si. Txoj kev lub cev - Qhov no yog txoj hauv kev tiag tiag cov ntaub ntawv nyob ntawm IIS. Txoj kev Virtual - Qhov no yog txoj hauv kev kom nkag mus rau cov ntaub ntawv uas tau taw qhia los ntawm sab nraud ntawm IIS daim ntawv thov folder
Dab tsi yog boolean hauv SQL?
Ib qho boolean yog hom ntaub ntawv uas tuaj yeem khaws qhov tseeb lossis qhov tsis tseeb. Qhov no feem ntau khaws cia li 1 (tseeb) lossis 0 (tsis tseeb). Nws muaj npe tom qab George Boole uas thawj zaug txhais ib qho kev ua lej ntawm cov logic hauv xyoo pua 19th. Boolean qhov tseem ceeb muaj ntau hauv cov lus programming, tab sis lawv puas muaj nyob hauv SQL?
Dab tsi yog Boolean cov ntaub ntawv hom hauv SQL Server?
Ib qho boolean yog hom ntaub ntawv uas tuaj yeem khaws qhov tseeb lossis qhov tsis tseeb. Qhov no feem ntau khaws cia li 1 (tseeb) lossis 0 (tsis tseeb). Nws yog lub npe hu ua George Boole uas thawj zaug txhais cov txheej txheem algebraic ntawm logic hauv xyoo pua 19th