Redis Zadd Command
The Redis Zadd command is used to add one or more member elements and their score values to a sorted set.
If a member is already in the sorted set, the member's score value is updated, and the member element is re-inserted to ensure the member is in the correct position.
Score values can be integer values or double-precision floating-point numbers.
If the sorted set key does not exist, an empty sorted set is created and the ZADD operation is performed.
When the key exists but is not a sorted set type, an error is returned.
Note:Before Redis version 2.4, ZADD could only add one element at a time.
Syntax
The basic syntax of the Redis Zadd command is as follows:
redis 127.0.0.1:6379> ZADD KEY_NAME SCORE1 VALUE1.. SCOREN VALUEN
Available Versions
>= 1.2.0
Return Value
The number of new members successfully added, excluding those existing members that were updated.
Example
redis> ZADD myzset 1 "one" (integer) 1 redis> ZADD myzset 1 "uno" (integer) 1 redis> ZADD myzset 2 "two" 3 "three" (integer) 2 redis> ZRANGE myzset 0 -1 WITHSCORES 1) "one" 2) "1" 3) "uno" 4) "1" 5) "two" 6) "2" 7) "three" 8) "3" redis>
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