In Redis, the BZMPOP command is the blocking variant of the ZMPOP command.

The BZMPOP command works exactly like ZMPOP when any of the sorted sets contain elements. It also works exactly like ZMPOP when used inside a MULTI/EXEC block. That is, it pops one or more elements from the first non-empty sorted set in the provided list of keys.

However, if all of the specified sorted sets are empty, then BZMPOP will block the connection until another client adds members to one of the keys or until the specified timeout elapses. It’s possible to block the connection indefinitely by using a timeout of zero.

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In Redis, the ZMPOP command removes and returns one or more elements from the first non-empty sorted set in the provided list of keys.

The ZMPOP command was introduced in Redis 7.0.0.

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In Redis, the ZCARD command returns the cardinality (number of elements) of a sorted set.

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In Redis, the ZINTERSTORE command computes the intersection of the specified sorted sets and stores the result in the specified key. It works the same as the ZINTER command, except that it stores the result instead of returning it.

If the destination key already exists, it’s overwritten.

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In Redis, the ZINTER command returns the intersection of the specified sorted sets. In other words, it returns only those members that are present in all sorted sets.

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In Redis, the ZDIFFSTORE command computes the difference between the first and all successive input sorted sets and stores the result in the specified key.

ZDIFFSTORE works in the same way as the ZDIFF command, except that it stores the result instead of returning it (ZDIFF returns the result instead of storing it in a new key).

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In Redis, the ZDIFF command returns the difference between the first and all successive input sorted sets.

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In Redis, the ZCOUNT command returns the number of elements in a sorted set with a score between two given values.

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In Redis, the ZREVRANK command returns the rank of the specified element of a sorted set ordered in descending order (from high to low).

If we want the set to be in ascending order, we can use the ZRANK command.

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