Returns the set cardinality (number of elements) of the set stored at key.
@return
@integer-reply: the cardinality (number of elements) of the set, or 0 if key
does not exist.
@examples
SADD myset "Hello"
SADD myset "World"
SCARD mysetReturns the set cardinality (number of elements) of the set stored at key.
@return
@integer-reply: the cardinality (number of elements) of the set, or 0 if key
does not exist.
@examples
SADD myset "Hello"
SADD myset "World"
SCARD myset