Video: Pivot SQL yog dab tsi?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
SQL ntawv Server pivot Taw qhia
SQL Pivot yog ib qho ntawm cov txheej txheem uas tso cai rau transposing ntawm kab mus rau kab thiab ua tau aggregations raws txoj kev. SQL PIVOT transposes lub rooj-tus nqi qhia los ntawm ib qho tshwj xeeb ntawm qhov muaj nuj nqis los ntawm ib kem mus rau ntau kab hauv cov zis thiab ua cov kev sib sau ua ke
Yog li ntawd, kev siv pivot hauv SQL yog dab tsi?
SQL PIVOT thiab UNPIVOT yog ob tus neeg ua haujlwm sib raug zoo uas yog siv hloov ib lub rooj qhia mus rau lwm qhov. PIVOT yog siv thaum peb xav hloov cov ntaub ntawv los ntawm kab theem mus rau kab ke thiab UNPIVOT yog siv thaum peb xav hloov cov ntaub ntawv los ntawm kab theem mus rau kab theem.
Ib sab saum toj no, pivot hauv Oracle SQL yog dab tsi? Kev piav qhia. Cov Oracle PIVOT clause tso cai rau koj los sau cov lus nug cross-tabulation pib hauv Oracle 11g ua. Qhov no txhais tau tias koj tuaj yeem sau koj cov txiaj ntsig thiab tig kab rau hauv kab.
Tsis tas li ntawd, cov lus pivot yog dab tsi?
PIVOT rotates lub rooj-valued qhia los ntawm tig cov cim qhov tseem ceeb ntawm ib kem nyob rau hauv cov lus qhia mus rau ntau kab nyob rau hauv cov zis. Lub syntax rau PIVOT muab tau yooj yim dua thiab nyeem tau ntau dua li cov syntax uas tej zaum yuav raug teev nyob rau hauv ib txoj kab ntawm SELECTCASE nqe lus.
Kuv pivot cov ntaub ntawv hauv SQL li cas?
Summary: nyob rau hauv no nyeem, koj yuav kawm paub siv cov SQL ntawv Server PIVOT tus neeg teb xov tooj hloov kab mus rau kab.
Taw qhia rau SQL Server PIVOT tus neeg teb xov tooj
- Ua ntej, xaiv ib lub hauv paus dataset rau pivoting.
- Qhov thib ob, tsim qhov tshwm sim ib ntus los ntawm kev siv lub rooj sib tham lossis cov lus qhia sib tham (CTE)
- Thib peb, siv tus neeg teb xov tooj PIVOT.
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