Cov txheej txheem:
Video: Kuv tuaj yeem ua dab tsi nrog cov yuam sij qub?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
10 Siv rau cov yuam sij
- Muab tooj dag los ua haujlwm. Muab tooj dag los ua haujlwm. Saib asslideshow.
- Siv raws li Plumb Bob. Siv raws li Plumb Bob.
- Tig lawv rau hauv Hooks. Tig lawv rau hauv Hooks.
- Ntxuav Boot Treads. Ntxuav Boot Treads.
- Weigh Down Curtains. Weigh Down Curtains.
- Pop ib Top. Pop ib Top.
- Anchor ib Balloon. Anchor ib Balloon.
- Tsim Qhov Rooj Chime. Tsim Qhov Rooj Chime.
Raws li, koj ua li cas nrog cov yuam sij qub?
Poob Nws: Luckily, cov yuam sij tuaj yeem rov ua dua tshiab ntawm cov chaw siv khoom siv rov ua dua tshiab hauv cov hlau sib xyaw. Ua paub meej koj tshem tawm cov roj hmab edging lossis cov ntawv nplaum kom lub chaw tuaj yeem yaj lawv thiab rov siv cov hlau. Hu rau koj lub chaw rov ua dua tshiab hauv zos lossis nrhiav lawv cov kev xav tau hauv online kom paub tseeb tias lawv lees txais cov hlau.
Qhov thib ob, koj ua li cas ntxuav cov yuam sij qub? Yuav kom nws ci, txhuam cov cov yuam sij nrog txiv qaub thiab ntsev thiab yaug nws nrog tshuaj ntxuav tais diav kom tshem tawm cov hlau hais uas tsim xeb. Ntsev thiab txiv qaub kuj tshem tawm cov dej noo uas absorbed los ntawm tus yuam sij hlau. Yog lub tsev cov yuam sij yog rusty, soak lawv nyob rau hauv dej thiab vinegar tov thiab tawm rau 20 feeb.
Tsis tas li ntawd, puas muaj nqi rau cov yuam sij qub?
Antique yuam sij tuaj yeem tsim nyog los ntawm txhua yam ntawm $ 1 thiab $ 500. Hnub nyoog, mob, nthuav dav, tsis tshua muaj, qhov hnyav, zoo li tus thiab loj yog tag nrho tus yuam sij kev xav.
Puas yog pob txha yuam sij universal?
Qhov kev txiav tawm yog qhov tseeb cev pob txha key” nyob rau hauv uas nws yog ib tug skeletonized yuam sij rau ib tug warded xauv. Lawv tsis muaj ib universal tus yuam sij uas ua haujlwm rau lawv ib yam, txawm hais tias lub qhov rooj qub qub hauv ib lub tsev feem ntau yog keyed ib yam nkaus, sohaving tus yuam sij rau ib lub qhov rooj hauv tsev tuaj yeem ua haujlwm rau lwm cov xauv sab hauv.
Pom zoo:
Dab tsi yog qhov sib txawv ntawm qhov qub txeeg qub teg vs classical qub txeeg qub teg?
Yog li ntawd, tus qauv yog ib tug generalization. Qhov sib txawv ntawm cov qub txeeg qub teg thiab cov qub txeeg qub teg yog qhov qub txeeg qub teg qub qub yog txwv rau cov chav kawm qub txeeg qub teg los ntawm lwm cov chav kawm thaum cov khoom qub txeeg qub teg txhawb nqa cloning ntawm txhua yam khoom siv cov khoom sib txuas
Ib tus yuam sij tseem ceeb puas tuaj yeem muaj ob tus yuam sij txawv teb chaws?
Nws yog qhov zoo kawg nkaus kom muaj ob kab ntawv tseem ceeb txawv teb chaws xa mus rau tib lub ntsiab lus tseem ceeb hauv ib lub rooj sib txawv vim tias txhua tus nqi tseem ceeb txawv teb chaws yuav siv cov ntaub ntawv sib txawv hauv cov lus hais
Cov yuam sij tseem ceeb thiab cov yuam sij txawv teb chaws yog dab tsi?
Relation of Primary Key vs Foreign Key Ib lub ntsiab tseem ceeb tshwj xeeb qhia cov ntaub ntawv nyob rau hauv lub rooj sib tham database, whereas tus yuam sij txawv teb chaws yog hais txog lub teb nyob rau hauv ib lub rooj uas yog lub ntsiab tseem ceeb ntawm lwm lub rooj
Ib tus yuam sij txawv teb chaws puas tuaj yeem siv lwm tus yuam sij txawv teb chaws?
1 Teb. Tus yuam sij txawv teb chaws tuaj yeem siv txhua qhov chaw uas txhais tau tias nws txawv. Yog hais tias qhov tshwj xeeb teb yog nws tus kheej txhais tau tias yog tus yuam sij txawv teb chaws, nws tsis txawv. Yog tias nws yog thaj chaw tshwj xeeb, nws kuj tuaj yeem yog lub hom phiaj ntawm lwm FK
Dab tsi yog qhov qub txeeg qub teg Dab tsi yog qhov sib txawv ntawm qhov qub txeeg qub teg piav nrog piv txwv?
Inheritance yog ib txoj hauv kev kom tau txais cov yam ntxwv thiab kev coj cwj pwm ntawm ib chav kawm los ntawm lwm chav kawm. Cov chav kawm uas cov tswv cuab tau txais qub txeeg qub teg yog hu ua chav kawm hauv paus, thiab chav kawm uas tau txais cov tswv cuab tam sim no hu ua chav derived. Inheritance siv IS-A kev sib raug zoo