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redis 127.0.0.1:6379> ZSCORE key member

redis 127.0.0.1:6379> ZRANGE salary 0 -1 WITHSCORES    # Test data
1) "tom"
2) "2000"
3) "peter"
4) "3500"
5) "jack"
6) "5000"

redis 127.0.0.1:6379> ZSCORE salary peter              # Note the return value is a string
"3500"