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Home/ Questions/Q 7998333
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Editorial Team
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Editorial Team
Asked: June 4, 20262026-06-04T15:11:23+00:00 2026-06-04T15:11:23+00:00

Is it possible to append to the list of values in a multi-valued attribute

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Is it possible to append to the list of values in a multi-valued attribute in an Amazon DynamoDB table? I am not quite able to figure it out using the put request. I would like to avoid the read, update, write logic if possible.

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  1. Editorial Team
    Editorial Team
    2026-06-04T15:11:26+00:00Added an answer on June 4, 2026 at 3:11 pm

    Assuming you are referring to String and Number Sets as outlined in Amazon DynamoDB Data Types, this is possible in Amazon DynamoDB by means of the UpdateItem operation indeed:

    ADD— Only use the add action for numbers or if the target attribute is a set (including string sets). ADD does not work if the
    target attribute is a single string value. The specified value is
    added to a numeric value (incrementing or decrementing the existing
    numeric value) or added as an additional value in a string set. If a
    set of values is specified, the values are added to the existing set.

    For example if the original set is [1,2] and supplied value is 3,
    then after the add operation the set is [1,2,3], not [4,5]. […]
    [emphasis mine]

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