Cov txheej txheem:
Video: Kuv yuav tsim cov lus nug parameter hauv SQL li cas?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2024-01-18 08:24
Tsim cov lus nug parameter
- Tsim a xaiv cov lus nug , thiab ces qhib lub nug hauv Design view.
- Hauv kab kev cai ntawm daim teb koj xav thov a parameter mus, sau cov ntawv uas koj xav kom tso rau hauv lub parameter lub thawv, ntim rau hauv square brackets.
- Rov ua kauj ruam 2 rau txhua qhov chaw koj xav ntxiv tsis muaj rau.
Hauv qhov no, dab tsi yog parameter hauv SQL query?
Tsis muaj yog siv los pauv cov ntaub ntawv ntawm cov txheej txheem khaws cia thiab kev ua haujlwm thiab daim ntawv thov lossis cov cuab yeej uas hu ua cov txheej txheem khaws cia lossis ua haujlwm: Input tsis muaj tso cai rau tus neeg hu kom dhau cov ntaub ntawv tus nqi rau cov txheej txheem khaws cia lossis ua haujlwm. Tus neeg siv-txhais ua haujlwm tsis tuaj yeem hais qhia tawm tsis muaj.
Dab tsi yog cov haujlwm hauv SQL? A muaj nuj nqi yog ib qho khoom siv database hauv SQL ntawv Server. Yeej, nws yog ib txheej ntawm SQL ntawv cov nqe lus uas lees txais cov kev nkag tsis tau nkaus xwb, ua cov yeeb yam thiab rov qab qhov tshwm sim. A muaj nuj nqi tuaj yeem xa rov qab tsuas yog ib qho nqi lossis ib lub rooj.
Ntawm no, kuv yuav ntxiv qhov parameter rau SQL lus nug hauv Excel li cas?
- Nyem rau qhov Definition tab.
- Hauv seem "Command text:" ntu, Muab tshuaj rau hauv SQL Query tiag tiag uas koj xav tau nrog tib tus lej ntawm qhov koj tau teev ua ntej.
- Nyem qhov Parameters khawm.
- Nyem OK kaw lub qhov rais khoom.
Tshaj tawm hauv SQL yog dab tsi?
Tshaj tawm ib variable The DECLARE nqe lus pib pib qhov sib txawv los ntawm kev muab nws lub npe thiab hom ntaub ntawv. Lub npe sib txawv yuav tsum pib nrog @ kos npe. Hauv qhov piv txwv no, cov ntaub ntawv hom ntawm @model_year hloov pauv yog SMALLINT. Los ntawm lub neej ntawd, thaum muaj qhov sib txawv tshaj tawm , nws tus nqi yog teem rau NULL.
Pom zoo:
Yuav ua li cas koj tuaj yeem txav qhov taw tes nrawm nrawm mus rau qhov pib ntawm cov lus nug cov lus nug?
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