Max length of the contents in a Column

Hello all,
I have a column of type varchar and of size 7000.Is there a function available to find the max length of contents in that column?

eg:table person{ssn,firstName,lastName}

I would like to find the max length of the column 'firstName' which is 7.

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select max(len(firstName)) as [max length] from  person

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select max(datalength(firstName)) as [max length] from  person

The only difference in this case is that unlike the len function, datalenght does count trailing spaces.
You'd have to use datalength/2 for nvarchar datatype, since datalength calculates the size in bytes,
and nvarchar uses 2 bytes/character  (1 for varchar)
if you want to know the length of the data in a column you always
need to use the DATALENGTH function

if you use Len(col) then that will ignore trailing blanks...

if the column is a Unicode data type Nvarchar etc.. then divide the result of DATALENGTH(col) by 2 to
get the number of characters long the data is.
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Microsoft SQL Server

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