Value/set in redis

features ： disorder 、 duplicate removal

sadd k1 s ss sss ssss s

smembers k1        s ss sss ssss

srem k1 s ss

smembers k1        sss ssss

sadd k2 1 2 3 4 5 

sadd k3 4 5 6 7 8

smembers k2         1 2 3 4 5 

smembers k3         4 5 6 7 8

sinter k2 k3        4 5        intersection

sinterstore dest k2 k3        intersection

smembers dest        4 5

sunion k2 k3        1 2 3 4 5 6 7 8        Combine

sdiff k2 k3        1 2 3        Difference set k2 - k2 k3 Union

sdiff k3 k2        6 7 8        Difference set k3 - k2 k3 Union

sadd k1 s ss sss ssss sssss ssssss sssssss

srandmember k1 5 -5 10 -10

 

srandmember key count

count Positive numbers ： Take out a de duplication result set （ Cannot exceed existing set ）

count negative ： Take out a result set with duplicates , Be sure to meet the quantity you want

If 0： No return

spop key： Take out a