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DECLARE @Number INT = 123

DECLARE @Digits INT = 8

DECLARE @Result CHAR(8)

-- 第一種

SELECT @Result =
	RIGHT(
		CAST(
			POWER(10, @Digits) + @Number
			AS VARCHAR(9))
		, @Digits)

SELECT @Result

-- 第二種

SELECT @Result =
	REPLICATE('0', 
		@Digits - DATALENGTH(CAST(@Number AS VARCHAR(8)))) +
	CAST(@Number as VARCHAR(8))
	
SELECT @Result