Video: Dab tsi yog Variant data type hauv Snowflake?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
VARIANT . Tagged universal hom , uas tuaj yeem khaws cov txiaj ntsig ntawm lwm yam hom , suav nrog OBJECT thiab ARRAY, mus txog qhov loj tshaj plaws ntawm 16 MB compressed. Tus nqi ntawm ib qho hom ntaub ntawv yuav implicitly pov rau ib VARIANT tus nqi, raws li kev txwv loj.
Ua raws li qhov no saib, hom ntaub ntawv twg tuaj yeem khaws cia hauv Snowflake?
Thaum twg cov ntaub ntawv yog loaded rau hauv Snowflake , Snowflake reorganizes qhov ntawd cov ntaub ntawv nyob rau hauv nws internal optimized, compressed, columnar hom. Snowflake khw no optimized cov ntaub ntawv hauv huab cia.
Qhov thib ob, hom SQL twg yog snowflake? Snowflake yog cov ntaub ntawv platform thiab cov ntaub ntawv warehouse uas txhawb nqa cov txheej txheem ntau tshaj plaws ntawm SQL: ANSI. Qhov no txhais tau hais tias tag nrho cov kev ua haujlwm feem ntau siv tau hauv Snowflake. Snowflake kuj txhawb nqa tag nrho cov haujlwm uas ua kom cov ntaub ntawv khaws cia cov haujlwm, xws li tsim, hloov kho, ntxig , lwm.
Kuj Paub, hom ntaub ntawv twg hauv Snowflake tso cai rau khaws cov ntaub ntawv ib nrab?
Snowflake muaj ib hom ntaub ntawv rau Variant, uas tsuas yog rau khaws cia ib nrab - cov ntaub ntawv tsim nyog . Qhov no Variant hom ntaub ntawv txhais tau tias kuv tuaj yeem xa kuv cov ntaub ntawv JSON rau txhua lub nroog ua kab rau kuv lub rooj.
Puas muaj cov ntaub ntawv snowflakes unstructured?
Qhov tseem ceeb, Snowflake txhawb cov neeg nyiam tshaj plaws cov ntaub ntawv hom ntawv xws li JSON, Avro, Parquet, ORC thiab XML. Muaj peev xwm yooj yim khw kev tsim kho, tsis tsim nyog , thiab semi-structured cov ntaub ntawv yuav pab daws qhov teeb meem ntawm kev daws txhua qhov tsis sib haum xeeb cov ntaub ntawv hom uas muaj nyob hauv ib leeg cov ntaub ntawv lub tsev khaws khoom.
Pom zoo:
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