Category "blob"

Unsure if an existing project is using blob files of some other data format

I am working on an application that was created by a colleague that is no longer with the company. I am trying to open what I believe is a PDF in blob file form

Conditions (like "like") on binary field (blob) in oracle

How can I search in (put condition on) blob field in oracle, like text fields? I need someting like: select * from table_name where blob_field like '%00ff00ff