Get all custom field values

  • Hello everyone,

    Is there a way to get all custom fields of a certain key listed?

    Example:
    Post 1: key = place & val = amsterdam
    Post 2: key = place & val = rotterdam
    Post 3: key = place & val = ede

    No I want to get all values (amsterdam, rotterdam, ede) listed. Also, the value should be only shown’ once.

    Hoping for help!

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