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insert into files(`myblob`) VALUES (Select `myBlob` from `myTable` where `blobID`=27); update `myTable` SET `mybob` = mid(`myBlob`,27,5,'myNEWDATA') where `blobID`=27; So 27 is the start of the blob that needs updating, 5 is the length of the update, and myNEWDATA is the newData from the new file.
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