The BYTE_LENGTH64 function returns an unsigned 64-bit value containing the byte length of the large object column or variable parameter.
BYTE_LENGTH64( large-object-column )
large-object-column The name of a LONG VARCHAR or LONG BINARY column or variable.
The BYTE_LENGTH64 function supports both LONG BINARY and LONG VARCHAR columns and LONG BINARY and LONG VARCHAR variables of any size of data. Currently, a SQL variable can hold up to 2GB - 1 in length.
