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Any attribute in rough relational database (RRDB) can be multi-valued, and has an indiscernibility relation in its domain. Currently, the research on rough data querying mainly discussed some simple select-querying. That is, selecting the tuples whose attribute's value is equal to a constant from a single table. The main idea of its implementation is to expand the original search conditions according to the indiscernibility relation in attribute's domain. Because the search conditions after being expanded need more calculation, the querying becomes very slow. In this paper, we present a solution called rough data querying based on encoding. Firstly encode the data of multi-valued attribute into the single-valued data according to the indiscernibility relation in attribute's domain, and then execute the querying on the single-valued data despite the indiscernibility relation to make the implementation of rough data querying much simpler and more efficient.