posted 13 years ago
A 'Binary Large OBject' (BLOB) is typically used to hold documents or images when you wish to store them in a database. As been pointed out, it's very strange to have a float stored in such a database type. If for whatever reason this has been done, the question is not to convert blob to float, but to extract the value from the blob.
But I strongly suggest that you check your requirements.
Maybe you can give some more details about your project, some details about the database/table perhaps or even some code you've already written.
Cheers,
Wim