# Redis `hyperloglog` commands (3/3 implemented)

## [PFADD](https://redis.io/commands/pfadd/)

Adds elements to a HyperLogLog key. Creates the key if it doesn't exist.

## [PFCOUNT](https://redis.io/commands/pfcount/)

Returns the approximated cardinality of the set(s) observed by the HyperLogLog key(s).

## [PFMERGE](https://redis.io/commands/pfmerge/)

Merges one or more HyperLogLog values into a single key.



