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This question already has an answer here:

What determines whether you can open an attribute table inqGIS?. I'd like to edit an attribute table for a raster in qGIS, but it won't me open the table. There's plenty in the help about editing attribute tables, but it doesn't say when you can/can't open them

marked as duplicate by ahmadhanb, HDunn, ArMoraer, nmtoken, tinlyx Mar 22 '18 at 9:57

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Vector data types have a table of attributes - which can be opened in QGIS. Raster datasets generally do not have table of attributes A raster datatype is a grid where each cell has a value.

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