How to convert float to varchar in SQL Server

Question

I have a float column with numbers of different length and I'm trying to convert them to varchar.

Some values exceed bigint max size, so I can't do something like this

cast(cast(float_field as bigint) as varchar(100))

I've tried using decimal, but numbers aren't of the same size, so this doesn't help too

CONVERT(varchar(100), Cast(float_field as decimal(38, 0)))

Any help is appreciated.

UPDATE:

Sample value is 2.2000012095022E+26.

Answer 1

Try using the STR() function.

SELECT STR(float_field, 25, 5)

STR() Function

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Another note: this pads on the left with spaces. If this is a problem combine with LTRIM:

SELECT LTRIM(STR(float_field, 25, 5))