Insert BLOB field in Interbase Table

iHi!  I have a SQL question related to Interbase

1.  How to insert/update BLOB field to Interbase table using
    SQL statement?

    2.  How to use DECLARE statement in TQuery object and
        DBExplorer?

                I read through the Interbase SQL on-line help and I
                found
                nothing that is helpful (I am not familar with SQL at
                all).

                Thanks in advance for any help!

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Jackal Yu                                                     o___o  
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