Cov txheej txheem:
Video: Kuv yuav hloov kho ntau kab hauv SQL li cas?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Rau hloov kho ntau kab siv SET clause los qhia ntxiv kab . Ib yam li nrog ib leeg kab koj qhia a kem thiab nws tus nqi tshiab, ces lwm txheej ntawm kem thiab tus nqi. Hauv qhov no txhua tus kem yog cais nrog a kem.
Tom qab ntawd, ib tus tuaj yeem nug, koj yuav hloov kho kab hauv SQL li cas?
SQL Hloov Kho Kab Syntax
- ALTER TABLE "table_name" MODIFY "column_name" "New DataType";
- ALTER TABLE "table_name" ALTER COLUMN "column_name" "New DataType";
- ALTER TABLE Cov neeg siv khoom MODIFY Chaw Nyob char(100);
- ALTER TABLE Cov neeg siv khoom MODIFY Chaw Nyob char(100);
- ALTER TABLE Customer ALTER COLUMN Chaw Nyob char(100);
Tsis tas li, peb tuaj yeem hloov kho ob lub rooj hauv ib qho lus nug hauv SQL? Cov lus teb luv luv rau qhov ntawd tsis yog. Thaum koj ua tau nkag ntau lub rooj nyob rau hauv lub clause ntawm ib hloov tshiab lus, ti ua tau tsuas qhia a ib lub rooj tom qab hloov tshiab lo lus tseem ceeb. Ib qho kev hloov kho, suav nrog Hloov tshiab , INSERT, thiab DELETE cov nqe lus, yuav tsum referencecolumns los ntawm xwb ib puag rooj.
Ib sab ntawm no, koj yuav hloov kho SQL li cas?
Ib SQL UPDATE nqe lus hloov cov ntaub ntawv ntawm ib lossis ntau cov ntaub ntawv hauv ib lub rooj. Ob tog tuaj yeem ua tau kho tshiab , los yog ib tug subset yuav raug xaiv siv ib tug mob. Cov Hloov tshiab nqe lus muaj daim ntawv hauv qab no: Hloov tshiab table_name SET column_name = tus nqi [, column_name = tus nqi]
Kuv yuav hloov kho kab hauv MySQL li cas?
MySQL UPDATE
- Ua ntej, qhia lub npe ntawm lub rooj uas koj xav tau updateata tom qab UPDATE lo lus tseem ceeb.
- Thib ob, qhia cov kab ntawv twg koj xav hloov kho thiab tus nqi tshiab hauv SET clause.
- Thib peb, qhia cov kab uas yuav tsum tau hloov kho tshiab siv cov xwm txheej hauv WHERE clause.
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