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Increments the score of member in the sorted set stored at key by increment. If member does not exist in the sorted set, it is added with increment as its score (as if its previous score was 0.0). If key does not exist, a new sorted set with the specified member as its sole member is created.

An error is returned when key exists but does not hold a sorted set.

The score value should be the string representation of a numeric value, and accepts double precision floating point numbers. It is possible to provide a negative value to decrement the score.

@return

@bulk-reply: the new score of member (a double precision floating point number), represented as string.

@examples

ZADD myzset 1 "one"
ZADD myzset 2 "two"
ZINCRBY myzset 2 "one"
ZRANGE myzset 0 -1 WITHSCORES
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