MySQL offers four blob types, which differ only in maximum size. They are tinyblob (256 bytes), blob (64 kilobytes),...
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mediumblob (16 megabytes) and longblob (4 gigabytes). There are also the binary and varbinary data types, which are the same as char ard varchar, but store binary strings. See http://dev.mysql.com/doc/refman/5.0/en/blob.html and http://dev.mysql.com/doc/refman/5.0/en/binary-varbinary.html for more details.
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