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+ SaddCommand
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+ #sidebar SetCommandsSidebar
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+ SADD _key_ _member_
+Time complexity O(1)Add the specified member to the set value stored at key. If memberis already a member of the set no operation is performed. If keydoes not exist a new set with the specified member as sole member iscreated. If the key exists but does not hold a set value an error isreturned.+
Return value
Integer reply, specifically:+1 if the new element was added +0 if the element was already a member of the set ++