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SQL Reference
SQL Reference : OpenEdge SQL Language Elements : Data types : Bit string data types : BLOB limitations
BLOB limitations
Current limitations for BLOB support are as follows:
*BLOB data columns cannot be part of an index.
*BLOB data columns cannot be used for variables or as parameters in stored procedures.
*Comparison operations are not supported on BLOB columns. Comparison operations between BLOB columns are not supported. Comparison operations between BLOB columns and columns of other data types are not supported.
*Conversion, aggregate, and scalar functions are disallowed on this data type.
*BLOB does not have National Language Support (NLS).
*The default size for a BLOB is 32000 bytes.