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
来源：https://stackoverflow.com/questions/507785/size-of-varbinary-field-in-sql-server-2005