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  ZADD _key_ _score_ _member_ (Redis >
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ZaddCommand

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- #sidebar SortedSetCommandsSidebar

ZADD _key_ _score_ _member_ (Redis >

1.1) = -Time complexity O(log(N)) with N being the number of elements in the sorted set
Add the specified member having the specifeid score to the sortedset stored at key. If member is already a member of the sorted setthe score is updated, and the element reinserted in the right position toensure sorting. If key does not exist a new sorted set with the specified_member_ as sole member is crated. If the key exists but does not hold asorted set value an error is returned.
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The score value can be the string representation of a double precision floatingpoint number.
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For an introduction to sorted sets check the Introduction to Redis data types page.
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Return value

Integer reply, specifically:

-1 if the new element was added
-0 if the element was already a member of the sorted set and the score was updated
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