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select difference('bet','bit')
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select left('abcdef',3)
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select replace('abcdef','cd','xx')
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select replace(replace('@22"33"','@',''),'"','')
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select replicate('abc',4)
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select reverse('abc')---cba
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select right('abcd',2)
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select rtrim('abcd ')
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select soundex('abd')
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select space(1)
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select str(100)
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select stuff('abcdef',2,4,'xxx')
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select substring('abcdef',2,3)
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select upper('abc')
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