Redis
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scard

SCARD

SCARD key

Available since 1.0.0.

Time complexity: O(1)

Returns the set cardinality (number of elements) of the set stored at key.

Return value

Integer reply: the cardinality (number of elements) of the set, or 0 if key does not exist.

Examples

redis> SADD myset "Hello" (integer) 1 redis> SADD myset "World" (integer) 1 redis> SCARD myset (integer) 2 登录查看完整内容