Trim empty spaces

Trim is used to remove write-space at the beginning or end of selection

In MSSQL there is no single TRIM()

SELECT LTRIM('  Hello  ') --returns 'Hello  '
SELECT RTRIM('  Hello  ') --returns '  Hello'
SELECT LTRIM(RTRIM('  Hello  ')) --returns 'Hello'

MySql and Oracle

SELECT TRIM('  Hello  ') --returns 'Hello'

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