Pawg pab pawg tso cai rau koj ua dab tsi?
Pawg pab pawg tso cai rau koj ua dab tsi?

Video: Pawg pab pawg tso cai rau koj ua dab tsi?

Video: Pawg pab pawg tso cai rau koj ua dab tsi?
Video: Plab Plab Ntswg..(Pluav Pluav Ntswg) Maiv Twm New Song 2023-2024 2024, Kaum ib hlis
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PIB YOG KEV PAB CUAM . PIB YOG KEV PAB CUAM yog ib tug haib extension ntawm lub PIB Los ntawm clause ntawd tso cai xam ntau yam pab pawg -los ntawm clauses hauv ib nqe lus. Cov pab pawg yog a teeb ntawm qhov seem.

Ib yam li ntawd, nws tau nug, lub hom phiaj ntawm pawg pawg subclause yog dab tsi thiab nws yog dab tsi yog qhov tseem ceeb siv?

KEV PAB CUAM siv los PIB thiab xam Sub Totals thiab Totals hauv ib set ntawm cov ntaub ntawv. SQL Server 2008 muaj a tshiab KEV PAB CUAM tus neeg teb xov tooj uas tuaj yeem tsim cov txiaj ntsig zoo ib yam teeb raws li qhov tsim los ntawm kev siv a yooj yim PIB Los ntawm, ROLLUP, lossis CUBE tus neeg teb xov tooj.

Ib yam li ntawd, vim li cas koj thiaj xav siv pawg hauv cov lus nug? Cov PIB Los ntawm nqe lus hauv SQL yog siv los npaj cov ntaub ntawv zoo ib yam rau hauv pab pawg nrog kev pab ntawm qee qhov haujlwm. i.e yog ib kab ntawv tshwj xeeb muaj tib tus nqi sib txawv hauv kab ces nws yuav npaj cov kab no hauv a pab pawg . Hauv nug , PIB YOG clause yog muab tso ua ntej ORDER BY clause yog siv ib qho.

Ib yam li ntawd, nws yog nug, dab tsi yog pawg pawg?

A pawg teeb yog a teeb ntawm kab uas koj pab pawg siv cov PIB YOG clause. Feem ntau, ib qho lus nug tag nrho txhais ib leeg pawg teeb . Cov piv txwv hauv qab no txhais tau tias a pawg teeb (warehouse, khoom).

Dab tsi yog pawg hauv SQL Server?

SQL GROUPING Muaj nuj nqi. los ntawm suresh. Cov SQL GROUPING yog ib ntawm cov SQL ntawv Aggregate Function, uas yog siv los qhia seb puas muaj kab ke hauv a PIB Los ntawm Clause aggregated los tsis. Qhov no Pab pawg muaj nuj nqi yuav rov qab ib qho rau aggregated thiab xoom rau tsis sib sau ua ke.

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