Size of VARBINARY field in SQL Server 2005

问题:

I am trying to determine the size in bytes of the contents in a VARBINARY(MAX) field in SQL Server 2005, using SQL. As I doubt there is native support for this, could it be done using CLR integration? Any ideas would be greatly appreciated.

回答1:

Actually, you can do this in T-SQL!

DATALENGTH(<fieldname>) will work on varbinary(max) fields.

回答2:

The VARBINARY(MAX) field allocates variable length data up to just under 2GB in size.

You can use DATALENGTH() function to determine the length of the column content.

For example:

SELECT DATALENGTH(CompanyName), CompanyName
FROM Customers