ZADD
same score
Initial
Play 1
Play 2
Play 3
Play 4
ZADD key score member [score member ...]
ZADD myzip 0 "New York"
ZADD myzip 0 "Seoul"
ZADD myzip 0 "Beijing"
ZADD myzip 0 "Tokyo"
myzip
0
Tokyo
0
Seoul
0
Beijing
0
New York
INDEX
REVERSE
INDEX