Adding upstream version 1.9.4.upstream/1.9.4

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 24 insertions, 0 deletions

diff --git a/iredis/data/commands/zdiffstore.md b/iredis/data/commands/zdiffstore.md
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+Computes the difference between the first and all successive input sorted sets
+and stores the result in `destination`. The total number of input keys is
+specified by `numkeys`.
+
+Keys that do not exist are considered to be empty sets.
+
+If `destination` already exists, it is overwritten.
+
+@return
+
+@integer-reply: the number of elements in the resulting sorted set at
+`destination`.
+
+@examples
+
+```cli
+ZADD zset1 1 "one"
+ZADD zset1 2 "two"
+ZADD zset1 3 "three"
+ZADD zset2 1 "one"
+ZADD zset2 2 "two"
+ZDIFFSTORE out 2 zset1 zset2
+ZRANGE out 0 -1 WITHSCORES
+```