{"id": "binary_data:binary-linking", "page": "binary_data", "ref": "binary-linking", "title": "Linking to binary downloads", "content": "The  .blob  output format is used to return binary data. It requires a  _blob_column=  query string argument specifying which BLOB column should be downloaded, for example: \n             https://latest.datasette.io/fixtures/binary_data/1.blob?_blob_column=data \n             This output format can also be used to return binary data from an arbitrary SQL query. Since such queries do not specify an exact row, an additional  ?_blob_hash=  parameter can be used to specify the SHA-256 hash of the value that is being linked to. \n             Consider the query  select data from binary_data  -  demonstrated here . \n             That page links to the binary value downloads. Those links look like this: \n             https://latest.datasette.io/fixtures.blob?sql=select+data+from+binary_data&_blob_column=data&_blob_hash=f3088978da8f9aea479ffc7f631370b968d2e855eeb172bea7f6c7a04262bb6d \n             These  .blob  links are also returned in the  .csv  exports Datasette provides for binary tables and queries, since the CSV format does not have a mechanism for representing binary data.", "breadcrumbs": "[\"Binary data\"]", "references": "[{\"href\": \"https://latest.datasette.io/fixtures/binary_data/1.blob?_blob_column=data\", \"label\": \"https://latest.datasette.io/fixtures/binary_data/1.blob?_blob_column=data\"}, {\"href\": \"https://latest.datasette.io/fixtures?sql=select+data+from+binary_data\", \"label\": \"demonstrated here\"}, {\"href\": \"https://latest.datasette.io/fixtures.blob?sql=select+data+from+binary_data&_blob_column=data&_blob_hash=f3088978da8f9aea479ffc7f631370b968d2e855eeb172bea7f6c7a04262bb6d\", \"label\": \"https://latest.datasette.io/fixtures.blob?sql=select+data+from+binary_data&_blob_column=data&_blob_hash=f3088978da8f9aea479ffc7f631370b968d2e855eeb172bea7f6c7a04262bb6d\"}]"}