Redis determines whether the value exists

Redis supports five data types:

string (string)

hash (hash)

list (list)

set ( Set)

zset(sorted set: ordered set)

redis determines whether the value exists

In SISMEMBER in the set and ZRANK, ZREVRANK, and ZSCORE in the ordered set can all determine whether a member is in the set!

Example:

The set command in redis to determine whether a certain value exists in the value of a certain key: sismember, if it exists, it returns 1, if it does not exist, it returns 1 Return 0

127.0.0.1:6379>sismember mySet 3  ---返回值为0，因为myset的set成员中只有1，2没有3
127.0.0.1:6379>sismember mySet 2   ---返回值为1，因为myset的Set成员中存在2.

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