Redis基础教程第7节 - Set
129.223.248.154:6379>scard
students
(integer) 1
129.223.248.154:6379> smembers students
1) "ben"
129.223.248.154:6379> srandmember students
"ben"
129.223.248.154:6379> sadd students mike
(integer) 1
129.223.248.154:6379> srandmember students
"ben"
129.223.248.154:6379> srandmember students
"mike"
129.223.248.154:6379> srandmember students
"mike"
129.223.248.154:6379> sadd memebrs a b c
(integer) 3
129.223.248.154:6379> srandmember students 2
1) "ben"
2) "mike"
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