Video: Peb puas tuaj yeem rov qab rooj los ntawm kev ua haujlwm hauv SQL?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
A rooj - muaj nuj nqis muaj nuj nqi rov qab ib rowset (tsis zoo li cov txheej txheem khaws cia, uas tuaj yeem rov qab los ntau qhov tshwm sim duab). Vim lub rov qab los yam a rooj - muaj nuj nqis muaj nuj nqi yog Rooj , koj ua tau siv a rooj - muaj nuj nqis muaj nuj nqi nyob qhov twg hauv SQL ntawv uas koj ua tau siv a rooj.
Ib yam li ntawd, nws tau nug, puas tuaj yeem ua haujlwm SQL rov qab lub rooj?
Taw qhia. Rooj - Muaj nuj nqis Muaj nuj nqi tau nyob ib ncig ntawm txij li thaum SQL ntawv Server version 2005. Yeej a Rooj - Muaj nuj nqis Muaj nuj nqi yog a muaj nuj nqi uas rov qab ib lub rooj , yog li ntawd nws ua tau siv ua ib rooj hauv ib qho lus nug.
Ib yam li ntawd, cov txheej txheem khaws cia rov qab tau lub rooj? Koj ua tau tsis technically rov "ib rooj ", mas koj tuaj yeem rov qab los ib qho tshwm sim thiab siv INSERT INTO.. EXEC syntax, koj ua tau meej hu a PROC thiab khaws cov txiaj ntsig rau hauv a rooj hom. Qhov xwm txheej tus nqi yog rov qab los los ntawm a Cov txheej txheem khaws cia tuaj yeem tsuas yog INT datatype.
Yog li ntawd, peb puas tuaj yeem xa rov qab cov lus tau teeb tsa los ntawm kev ua haujlwm?
Rov qab los a Teem caij los ntawm Cov Txheej Txheem Khaws Cia. Koj ua tau siv cov Rov qab kev xaiv rau rov qab los a tshwm sim , nyob rau hauv daim ntawv ntawm ib ntus rooj , los ntawm cov txheej txheem khaws cia. Qhov no ib ntus rooj tau tsuas yog muab tso rau hauv. Nws tsis tuaj yeem raug xa mus, los ntawm sab hauv cov txheej txheem khaws cia, siv SQL SELECT, UPDATE lossis DELETE nqe lus.
Dab tsi yog DBO hauv SQL?
Cov dbo ua , lossis tus tswv database, yog tus neeg siv tus account uas tau hais txog kev tso cai los ua txhua yam haujlwm hauv cov ntaub ntawv. Cov tswvcuab ntawm sysadmin lub luag haujlwm ruaj khov rau lub luag haujlwm tau raug kos npe rau dbo ua . dbo ua kuj yog lub npe ntawm ib tug schema, raws li tau tham nyob rau hauv Ownership thiab User-Schema Separation nyob rau hauv SQL ntawv Server.
Pom zoo:
Peb puas tuaj yeem ua hla thaj av rov ua dua hauv Amazon s3 yam tsis muaj kev ua haujlwm ntawm lub thoob?
Koj yuav tsum nco ntsoov tias koj tsis tuaj yeem ua lub thoob replication hauv ib cheeb tsam. Txhawm rau siv cov ntawv hla tebchaws, koj yuav tsum tau ua kom S3 versioning rau qhov chaw thiab cov thoob qhov chaw
Kuv tuaj yeem rov qab tau SQL Server cov ntaub ntawv los ntawm kev hloov kho tsis raug yam tsis muaj thaub qab?
Cov kev daws teeb meem feem ntau yog: Rov qab kho cov ntaub ntawv thaub qab thiab siv nws hloov pauv cov ntaub ntawv qub. Nyob rau hauv rooj plaub uas muaj lwm yam kev hloov pauv tau tshwm sim tom qab UPDATE lossis koj tsis tuaj yeem tso cai rau cov ntaub ntawv tawm hauv offline: Rov qab cov ntaub ntawv thaub qab ntawm lub server sim. Siv SQL Server Management Studio Export cov ntaub ntawv wizard kom xa cov ntaub ntawv
Koj puas tuaj yeem rov qab qhov sib txawv backup yam tsis muaj kev thaub qab tag nrho?
1 Teb. Nws tsis tuaj yeem ua qhov sib txawv ntawm qhov thaub qab ntawm cov ntaub ntawv yog tias tsis muaj kev thaub qab yav dhau los. Ib tug txawv backup yog raws li nyob rau hauv tsis ntev los no, yav tas los tag nrho cov ntaub ntawv backup. Ib tug txawv backup captures tsuas yog cov ntaub ntawv uas tau hloov txij li thaum uas tag nrho backup
Yuav ua li cas rov qab MySQL thaub qab thiab rov qab kho hauv Linux?
Txhawm rau kho cov ntaub ntawv mus rau MySQL database tshiab los ntawm kab hais kom ua, ua raws li cov kauj ruam no: Xyuas kom meej tias MySQL server tab tom khiav. Qhib lub davhlau ya nyob twg Linux tshiab. Siv tus neeg siv mysql los tsim cov ntaub ntawv tshiab, khoob khoob los tuav koj cov ntaub ntawv. Siv tus neeg siv mysql los import cov ntsiab lus ntawm cov ntaub ntawv thaub qab mus rau hauv cov ntaub ntawv tshiab
Peb puas tuaj yeem rov qab ResultSet hauv Java?
Txhawm rau rov qab cov txiaj ntsig tau teeb tsa los ntawm txoj kev Java Xyuas kom meej tias Java txoj kev tau tshaj tawm tias yog pej xeem thiab zoo li qub hauv chav kawm pej xeem. Rau txhua qhov tshwm sim koj xav kom cov txheej txheem rov qab los, xyuas kom meej tias cov txheej txheem muaj qhov ntsuas ntawm hom java. sql ua. ResultSet thiab mam li muab nws rau ib qho ntawm ResultSet[] parameters