Cov txheej txheem:
Video: Kuv yuav rho tawm kab hauv Oracle SQL li cas?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Oracle DELETE
- Ua ntej, koj qhia lub npe ntawm lub rooj uas koj xav tau rho tawm cov ntaub ntawv.
- Qhov thib ob, koj qhia qhov twg kab yuav tsum tau muab tshem tawm los ntawm kev siv cov xwm txheej hauv WHERE clause. Yog hais tias koj omit lub WHERE clause, lub Oracle DELETE nqe lus tshem tawm tag nrho kab los ntawm lub rooj.
Raws li txoj cai, koj yuav rho tawm kab hauv SQL li cas?
Txhawm rau tshem tawm ib lossis ntau kab hauv ib lub rooj:
- Ua ntej, koj qhia lub npe lub rooj uas koj xav tshem tawm cov ntaub ntawv hauv DELETE FROM clause.
- Qhov thib ob, koj muab ib qho xwm txheej nyob rau hauv WHERE clause kom qhia cov kab twg kom tshem tawm. Yog tias koj tshem tawm qhov twg los xij, nqe lus yuav tshem tawm tag nrho cov kab hauv lub rooj.
Dab tsi yog rho tawm hauv Oracle? Cov Oracle DELETE nqe lus yog siv rau rho tawm ib daim ntawv los yog ntau cov ntaub ntawv los ntawm ib lub rooj hauv Oracle.
Kuj kom paub yog, koj yuav rho tawm kab hauv ib lub rooj li cas?
Txhawm rau ua qhov no, xaiv kab lossis kab thiab tom qab ntawd nias tus yuam sij rho tawm
- Right-click nyob rau hauv lub rooj cell, kab, los yog kab koj xav rho tawm.
- Ntawm cov ntawv qhia zaub mov, nyem Delete Cells.
- Txhawm rau rho tawm ib lub xov tooj, xaiv Shift cells sab laug lossis Shift cells nce. Txhawm rau rho tawm kab, nyem Delete tag nrho kab. Txhawm rau rho tawm kab, nyem Delete tag nrho kab.
Qhov txawv ntawm truncate thiab rho tawm yog dab tsi?
DROP thiab TRUNCATE yog DDL commands, whereas DELETE yog DML hais kom ua. Yog li ntawd DELETE kev ua haujlwm tuaj yeem dov rov qab (undone), thaum DROP thiab TRUNCATE kev ua haujlwm tsis tuaj yeem thim rov qab. TRUNCATE tuaj yeem dov rov qab yog tias qhwv hauv a kev pauv nyiaj.
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