Redis Commands
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This command is equal to SDIFF, but instead of returning the resulting set, it is stored in destination.

If destination already exists, it is overwritten.

@return

@integer-reply: the number of elements in the resulting set.

@examples

SADD key1 "a"
SADD key1 "b"
SADD key1 "c"
SADD key2 "c"
SADD key2 "d"
SADD key2 "e"
SDIFFSTORE key key1 key2
SMEMBERS key

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