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Dab tsi yog qhov sib npaug ntawm trim hauv SQL Server?
Dab tsi yog qhov sib npaug ntawm trim hauv SQL Server?

Video: Dab tsi yog qhov sib npaug ntawm trim hauv SQL Server?

Video: Dab tsi yog qhov sib npaug ntawm trim hauv SQL Server?
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Los ntawm default, lub TRIM muaj nuj nqi tshem tawm qhov chaw cim los ntawm qhov pib thiab qhov kawg ntawm txoj hlua. Tus cwj pwm no yog sib npaug rau LTRIM (RTRIM(@string)).

Ib yam li ntawd, tib neeg nug, SQL Server trim yog dab tsi?

Txhais thiab siv. Cov TRIM () muaj nuj nqi tshem tawm qhov chaw cim LOSSIS lwm cov cim tshwj xeeb los ntawm qhov pib lossis xaus ntawm txoj hlua. Los ntawm default, lub TRIM () muaj nuj nqi tshem tawm qhov ua ntej thiab tom qab ntawm ib txoj hlua. Nco tseg: Kuj saib cov LTRIM () thiab RTRIM() ua haujlwm.

Tsis tas li ntawd, Ltrim thiab Rtrim yog dab tsi hauv SQL? RTRIM () thiab LTRIM () ua haujlwm hauv SQL ntawv Server RTRIM () muaj nuj nqi tshem tawm ib qho trailing blanks ntawm ib txoj hlua lossis kab. Thiab LTRIM () tshem tawm qhov khoob ntawm qhov pib ntawm txoj hlua tsis yog qhov kawg. RTRIM () thiab LTRIM () kev ua haujlwm tuaj yeem siv nrog txhua qhov tsis tu ncua, hloov pauv, lossis kab ntawm cov cim lossis cov ntaub ntawv binary.

Raws li txoj cai, kuv yuav ua li cas txiav ib txoj hlua hauv SQL Server?

Lub syntax rau TRIM muaj nuj nqi yog raws li nram no:

  1. TRIM([LOCATION] [remstr] FROM] str) [LOCATION] tuaj yeem yog LEADING, TRAILING, lossis ob qho tib si.
  2. LTRIM (str)
  3. RTRIM (str)
  4. SELECT TRIM('Sample');
  5. 'Sample'
  6. SELECT LTRIM('Sample');
  7. 'Sample'
  8. SELECT RTRIM('Sample');

Ltrim yog dab tsi hauv SQL?

Kev piav qhia. Hauv SQL ntawv Server (Kev hloov pauv- SQL ntawv ), cov LTRIM muaj nuj nqi tshem tawm txhua qhov chaw cim los ntawm sab laug-tes ntawm ib txoj hlua.

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