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    ReQL command: distinct

    Command syntax

    sequence.distinct() → array

    table.distinct() → stream

    r.distinct(sequence) → array

    r.distinct(table) → stream


    Removes duplicates from elements in a sequence.

    The distinct command can be called on any sequence or table with an index.

    While distinct can be called on a table without an index, the only effect will be to convert the table into a stream; the content of the stream will not be affected.

    Example: Which unique villains have been vanquished by Marvel heroes?

        hero -> hero.g("villain_list")

    Example: Topics in a table of messages have a secondary index on them, and more than one message can have the same topic. What are the unique topics in the table?

    r.table("messages").distinct().optArg("index", "topics").run(conn);

    The above structure is functionally identical to:


    However, the first form (passing the index as an argument to distinct) is faster, and won’t run into array limit issues since it’s returning a stream.

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