Cov txheej txheem:
Video: Kuv yuav hloov cov kev txwv tshwj xeeb hauv SQL li cas?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Txhawm rau hloov qhov kev txwv tshwj xeeb
- Hauv Object Explorer, right-click lub rooj uas muaj cov tshwj xeeb txwv thiab xaiv Tsim.
- Nyob rau ntawm Table Designer ntawv qhia zaub mov, nyem Indexs/Keys.
- Hauv Indexes/Keys dialog box, nyob rau hauv Xaiv Thawj/ Cim Ntsiab lossis Index, xaiv qhov txwv koj xav tau kho .
Ua li no, koj yuav hloov cov kev txwv hauv SQL li cas?
Siv SQL Server Management Studio
- Hauv Object Explorer, right-click lub rooj uas muaj cov kev txwv kos thiab xaiv Tsim.
- Nyob rau ntawm Table Designer ntawv qhia zaub mov, nyem Kos Cov Kev Txwv.
- Nyob rau hauv Cheeb Tsam Constraints dialog box, nyob rau hauv Selected Check Constraint, xaiv qhov txwv koj xav hloov.
Yuav ua li cas koj tshem tawm ib qho kev txwv tshwj xeeb? Txhawm rau rho tawm qhov txwv tshwj xeeb siv Table Designer
- Hauv Object Explorer, right-click lub rooj nrog qhov tshwj xeeb txwv, thiab nyem Tsim.
- Nyob rau ntawm Table Designer ntawv qhia zaub mov, nyem Indexs/Keys.
- Hauv Indexes/Keys dialog box, xaiv tus yuam sij tshwj xeeb hauv Cov Ntawv Xaiv Thawj / Cim Cim thiab Cov Ntawv Qhia.
- Nyem Rho tawm.
Tom qab ntawd, lo lus nug yog, Kuv yuav ua li cas thiaj tsim tau ib qho kev txwv tshwj xeeb hauv SQL?
Hauv Object Explorer, right-click lub rooj uas koj xav tau ntxiv a tshwj xeeb txwv , thiab nyem Tsim. Nyob rau ntawm Table Designer ntawv qhia zaub mov, nyem Indexs/Keys. Hauv Indexs/Keys dialog box, nyem Ntxiv . Hauv daim phiaj hauv General, nyem Hom thiab xaiv Cim Qhov tseem ceeb ntawm lub npov drop-down mus rau sab xis ntawm cov cuab yeej.
Yuav ua li cas koj lub npe ib tug tshwj xeeb txwv?
Lub npe convention rau ib tug tshwj xeeb txwv yog:
- Qhov tshwj xeeb txwv yuav tsum siv cov syntax “UQ_.
- Txhua lub npe tshwj xeeb txwv yuav tsum muaj "UQ_" ua ntej.
- Thawj tsab ntawv ntawm TableName thiab ColumnName yuav tsum tau sau npe.
Pom zoo:
Dab tsi yog qhov tshwj xeeb uas pab saib xyuas cov haujlwm ntawm kev ruaj ntseg thiab kev tshuaj xyuas hauv s3 thoob?
AWS pab saib xyuas cov haujlwm ntawm kev ruaj ntseg thiab kev tshuaj xyuas hauv ib lub thoob. Nws tiv thaiv cov ntaub ntawv tseem ceeb kom xau tsis raug. AWS muab ntau yam kev pabcuam kev nyab xeeb uas tiv thaiv kev tsim kho vaj tse thiab cov khoom muaj nqis
Cov kev pabcuam lossis cov txheej txheem twg uas Secure Copy Protocol vam khom kom ntseeg tau tias kev hloov pauv kev nyab xeeb yog los ntawm cov neeg siv tau tso cai?
Cov kev pabcuam lossis cov txheej txheem twg uas Secure Copy Protocol vam khom kom ntseeg tau tias kev hloov pauv kev nyab xeeb yog los ntawm cov neeg siv tau tso cai? Secure Copy Protocol (SCP) yog siv los luam cov duab IOS kom ruaj ntseg thiab teeb tsa cov ntaub ntawv mus rau SCP server. Txhawm rau ua qhov no, SCP yuav siv SSH kev sib txuas los ntawm cov neeg siv uas tau lees paub los ntawm AAA
Dab tsi ntawm cov hauv qab no yog ib qho piv txwv ntawm txoj cai encoding tshwj xeeb?
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Puas muaj ib txoj hauv kev hauv IAM system tso cai lossis tsis kam nkag mus rau ib qho piv txwv tshwj xeeb?
Tsis muaj txoj hauv kev hauv IAM system tso cai lossis tsis kam nkag mus rau kev ua haujlwm ntawm ib qho piv txwv tshwj xeeb. IAM tso cai rau kev nkag mus rau cov piv txwv tshwj xeeb
Yuav ua li cas koj tso ib qho kev txwv tshwj xeeb hauv Oracle?
Cov syntax rau tso tseg ib qho kev txwv tshwj xeeb hauv Oracle yog: ALTER TABLE table_name DROP CONSTRAINT constraint_name; table_npe. Lub npe ntawm lub rooj hloov