SQL convert number to string representation of any base (binary, hexadecimal, …, tricontahexadecimal)

Question

How to convert a number to it string representation for a desired numeric base using SQL, for example convert 45 to the base 2(binary), 8(octantal),16(hexadecimal), ..36.

Answer 1

Hope this helps:

-- Decimal to hex 
SELECT CAST(493202384 AS varbinary)

-- Hex to decimal 
SELECT CAST(0x1D65ABD0 AS int)

-- Decimal to hex to decimal 
SELECT CAST(CAST(493202384 AS varbinary) AS int)

-- Binary to decimal 
CREATE FUNCTION [dbo].[BinaryToDecimal] 
(
    @Input varchar(255)
)
RETURNS bigint 
AS
BEGIN

    DECLARE @Cnt tinyint = 1
    DECLARE @Len tinyint = LEN(@Input)
    DECLARE @Output bigint = CAST(SUBSTRING(@Input, @Len, 1) AS bigint)

    WHILE(@Cnt < @Len) BEGIN
        SET @Output = @Output+POWER(CAST(SUBSTRING(@Input, @Len-@Cnt,1)*2 AS bigint), @Cnt)
        SET @Cnt = @Cnt + 1
    END
    RETURN @Output
END

-- Decimal to binary 
CREATE FUNCTION [dbo].[DecimalToBinary]
(
    @Input bigint
)
RETURNS varchar(255)
AS
BEGIN

    DECLARE @Output varchar(255) = ''

    WHILE @Input > 0 BEGIN

        SET @Output = @Output + CAST((@Input % 2) AS varchar)
        SET @Input = @Input / 2
    END
    RETURN REVERSE(@Output)
END