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# Redis PFMERGE Command * (javascript:void(0);) * (javascript:void(0);) * (javascript:void(0);) * (javascript:void(0)) Redis Tutorial (#)(#)(#)(#)(#) ## Redis Commands (#)(#)(#)(#)(#)(#)(#)(#)[Redis Publish/Subscribe](#)(#)(#)(#)(#)(#)(#) ## Redis Advanced Tutorial (#)(#)(#)(#)(#)(#)(#)(#) [](#)(#) [Redis Publish/Subscribe](#)[](#) Deep Dive Scripts Programming Scripting Languages Web Data Management Development Tools Web Services Search Web Service Computer Science # Redis PFMERGE Command !(#)(#) The Redis PFMERGE command merges multiple HyperLogLogs into a single HyperLogLog. The cardinality estimate of the resulting HyperLogLog is derived by computing the union of all given HyperLogLogs. ### Syntax The basic syntax of the redis PFMERGE command is as follows: PFMERGE destkey sourcekey [sourcekey ...] ### Available Versions >= 2.8.9 ### Return Value Returns OK. ### Example redis> PFADD hll1 foo bar zap a (integer) 1 redis> PFADD hll2 a b c foo (integer) 1 redis> PFMERGE hll3 hll1 hll2 "OK" redis> PFCOUNT hll3 (integer) 6 redis> !(#)(#)