<i>Time complexity O(N) where N is the total number of elements in all the provided sets</i><blockquote>Return the members of a set resulting from the union of all thesets hold at the specified keys. Like in LRANGE the result is sent tothe client as a multi-bulk reply (see the protocol specification formore information). If just a single key is specified, then this commandproduces the same result as SELEMENTS.</blockquote>
<blockquote>Non existing keys are considered like empty sets.</blockquote>
<h2><aname="Return value">Return value</a></h2><ahref="ReplyTypes.html">Multi bulk reply</a>, specifically the list of common elements.<h2><aname="See also">See also</a></h2>