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In order to obtain the score value from a key name in a sorted set in Redis, you can use the ZSCORE command followed by the name of the sorted set and the key name.
The syntax for ZSCORE command is:
ZSCORE key member
For example, if you have a sorted set named "myset" with the following values:
redis> ZADD myset 10 "key1"
(integer) 1
redis> ZADD myset 20 "key2"
(integer) 1
You can obtain the score value of "key1" by using the following command:
redis> ZSCORE myset key1
"10"
This command will return the score value of "key1" which is 10.