How to get the size of a varchar[n] field in one SQL statement?

Question

Suppose that I have a SQL table that has a varchar[1000] field called \"Remarks\".

I would like to craft a single SQL statement, which when executed, will return 100

Answer 1

I was looking for the TOTAL size of the column and hit this article, my solution is based off of MarcE's.

SELECT sum(DATALENGTH(your_field)) AS FIELDSIZE FROM your_table