Cov txheej txheem:
Video: Insert command yog dab tsi?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Ntxig yog ib tug dav-siv lus txib hauv Structured Query Language (SQL) data manipulation language (DML) siv los ntawm SQL Server thiab Oracle relational databases. Cov ntxig lus txib yog siv rau ntxig ib los yog ntau kab rau hauv ib lub rooj database nrog cov lus teev kab ke.
Ib yam li ntawd, nws yog nug, ua li cas koj ntxig ib lub rooj?
Txhawm rau ntxig ib kab rau hauv lub rooj, koj yuav tsum qhia peb yam:
- Ua ntej, lub rooj, uas koj xav tau ntxig ib kab tshiab, hauv INSERT INTO clause.
- Qhov thib ob, ib daim ntawv teev cov kab sib cais ntawm cov kab hauv lub rooj nyob ib puag ncig los ntawm cov kab lus.
- Thib peb, ib daim ntawv teev npe sib cais ntawm qhov tseem ceeb nyob ib puag ncig los ntawm cov kab lus hauv VALUES kab lus.
Tom qab ntawd, lo lus nug yog, dab tsi ntxig rau hauv rov qab? INSERT cov ntaub ntawv kab tshiab rau hauv ib lub rooj. Ib tug ua tau ntxig ib lossis ntau kab teev los ntawm tus nqi qhia, lossis xoom lossis ntau kab uas tshwm sim los ntawm cov lus nug. Qhov xaiv tau Rov qab clause ua INSERT suav thiab rov qab los tus nqi (s) raws li txhua kab ua tau ntxig (los yog hloov kho, yog tias muaj kev tsis sib haum xeeb DO UPDATE clause tau siv).
Ib yam li ntawd, nws yog nug, dab tsi yog cov ntaub ntawv ntxig?
Cov ntaub ntawv nkag yog tus txheej txheem ntawm ntxig kab rau hauv ib lub rooj. Cov cov ntaub ntawv nkag txoj kev thiab ib qho piv txwv ntawm kev qhia SQL nqe lus tau qhia raws li hauv qab no. Cov ntaub ntawv nkag txoj kev. Cov INSERT nqe lus yog siv rau ntxig kab.
Peb puas tuaj yeem tso cov ntaub ntawv hauv kev saib?
A saib tau txhais tau tias yog lub rooj virtual lossis cov lus nug khaws tseg thiab cov cov ntaub ntawv nkag tau los ntawm a saib yog tsis khaws cia rau hauv lub database raws li ib yam khoom. Koj tuaj yeem ntxig cov ntaub ntawv mus rau lub rooj saum toj no siv cov views peb nyuam qhuav tsim. Thiab nws yog tib syntax uas peb siv rau ntxig cov ntaub ntawv rau rooj.
Pom zoo:
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