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Redis Transactions, Pub/Sub, and Streams Cheat Sheet/Merge HyperLogLogs

Merge approximate cardinality structures.

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Section: Geo, bitmaps, and HyperLogLog

Merge HyperLogLogs

bash
bash
PFMERGE unique:all unique:web unique:mobile

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Add elements to HyperLogLog
Approximate cardinality of unique items.
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Read approximate unique cardinality.
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