Cov txheej txheem:
Video: Koj puas tuaj yeem dhau qhov ntsuas mus rau qhov pom?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
yog koj yuav tsum tau siv tus neeg siv lub luag haujlwm rau qhov twg koj tuaj yeem dhau qhov ntsuas rau hauv. Tsis yog, a saib yog queried tsis txawv rau SELECTing los ntawm ib lub rooj. A saib tsis muaj dab tsi ntau tshaj li cov lus qhia 'SELECT'. Yog li tsuas yog cov lus teb tiag yuav be: Tsis yog, koj ua tsis tau.
Ua li no, peb tuaj yeem dhau qhov ntsuas pom hauv Oracle?
Parameterized Saib - Hla Parameters hauv Saib . Oracle ua tsis txhawb tsis muaj nrog Saib , mas peb ua tau ib txwm nrhiav kev daws teeb meem. Nyob rau hauv cov ntaub ntawv ntawm parameterized saib nyob ntawd ua tau ua ntau yam workarounds. SQL> tsim saib emp_dept_v as 2 xaiv e.
Peb puas tuaj yeem tsim parameterized saib hauv SQL Server? Parameterized saib hauv SQL Server nrog piv txwv. Parameterized saib txhais tau tias peb ua tau hla ib co nqi kom tau cov ntaub ntawv los ntawm cov saib lub rooj los ntawm kev siv saib . Raws li Kuv hais tias, tsis muaj txoj kev mus tsim parameterized saib yog li dab tsi yog txoj hauv kev tau txais cov ntaub ntawv los ntawm kev siv cov ntsuas.
Hais txog qhov no, dab tsi yog qee qhov kev txwv ntawm kev pom?
Cov kev txwv no suav nrog:
- Koj tsis tuaj yeem hla tsis dhau mus rau SQL Server views.
- Tsis tuaj yeem siv Order By clause nrog views yam tsis tau qhia FOR XML lossis TOP.
- Views tsis tuaj yeem tsim nyob rau ntawm Lub Sijhawm Ib ntus.
- Koj tsis tuaj yeem koom nrog cov kev cai thiab kev ua tsis tau raws li kev pom.
Dab tsi yog parameterized saib hauv Oracle?
Lub hom phiaj tseem ceeb ntawm a Parameterized Saib cia koj khaws PL/SQL cov ntaub ntawv sau cov qauv hauv SQL ntsiab lus. Lwm txoj hauv kev yog sau ib pob kom tau txais thiab teeb tsa tus nqi parameterize saib nyob rau hauv lub ntiaj teb no sib txawv los yog sys_context, tom qab ntawm a saib siv tau tus nqi los ntawm, uas hu ua thiaj li hu ua parameterized saib.
Pom zoo:
Leej twg ua qhov ntsuas ntsuas ntsuas?
UNIT TESTING yog ib theem ntawm kev sim software uas ib tus neeg/cov khoom ntawm cov software raug kuaj. Lub hom phiaj yog los xyuas kom meej tias txhua chav ntawm lub software ua tau raws li tsim. Ib chav tsev yog qhov tsawg tshaj plaws kuaj tau ib feem ntawm ib qho software
Qhov twg nyob rau hauv ib lub rooj ntaub ntawv yuav tsum tau muab tso rau qhov ntsuas ntsuas?
Nyob rau hauv ib lub rooj ntaub ntawv, units ntawm kev ntsuas yuav tsum tau qhia nyob rau hauv cov nqe lus ntawm cov kab uas cov ntaub ntawv muaj nuj nqis teev. Qhov no qhia tau hais tias chav tsev qhia siv rau tag nrho cov ntaub ntawv muaj nuj nqis teev nyob rau hauv kab
Koj puas tuaj yeem ncua kev xa ntawv xa mus dhau ib xyoos?
Koj yuav tsum xa ntawv xa mus rau yam tsawg kawg ntawm 14 hnub. Thaum koj pib teeb tsa, koj tuaj yeem npaj xa ntawv xa mus txog 6 lub hlis. Koj tuaj yeem txuas ntxiv qhov no tom qab koj qhov kev thov thawj zaug mus txog ib xyoos (12 lub hlis)
Dab tsi yog qhov sib txawv ntawm qhov ntsuas qhov ntsuas thiab qhov ntsuas thib ob?
Primary index: nyob rau hauv ib tug sequentially order file, qhov Performance index uas nws search key qhia cov sequential order ntawm cov ntaub ntawv. Kuj hu ua clustering index. Secondary index: ib qho Performance index uas nws qhov tseem ceeb tshawb nrhiav qhia qhov kev txiav txim sib txawv ntawm qhov kev txiav txim ntawm cov ntaub ntawv. Kuj hu ua non-clustering index
Dab tsi yog qhov ntsuas qhov ntsuas qhov ntsuas qhov ntsuas?
Xav txog nws li no: rhiab heev yog ib qho kev ntsuas ntawm qhov hloov pauv ntawm lub koob yees duab qhov chaw saib uas tsim nyog raws li qhov muaj peev xwm tshawb pom, thiab qhov pib yog qhov ntau npaum li cas ntawm cov lus tsa suab yuav tsum tshwm sim txhawm rau txhawm rau ua rau lub tswb