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Clustercluster addslots(集群 槽位)cluster count failure reports(集群计数失败报告)cluster countkeysinslotcluster delslotscluster failovercluster forgetcluster getkeysinslotcluster infocluster keyslot(集群键槽)cluster meetcluster nodes(集群节点)cluster replicate(集群复制)cluster reset(集群重置)cluster saveconfigcluster set config epochcluster setslotcluster slavescluster slotsreadonlyreadwriteConnectionauthechopingquitselectswapdbGeogeoaddgeodistgeohashgeoposgeoradiusgeoradiusbymemberHasheshdelhexistshgethgetallhincrbyhincrbyfloathkeyshlenhmgethmsethscanhsethsetnxhstrlenhvalsHyperLogLogpfaddpfcountpfmergeKeysdeldumpexistsexpireexpireatkeysmigratemoveobjectpersistpexpirepexpireatpttlrandomkeyrenamerenamenxrestorescansorttouchttltypeunlinkwaitListsblpopbrpopbrpoplpushlindexlinsertllenlpoplpushlpushxlrangelremlsetltrimrpoprpoplpushrpushrpushxPub/SubpsubscribepublishpubsubpunsubscribesubscribeunsubscribeScriptingevalevalshascript debugscript existsscript flushscript killscript loadServerbgrewriteaofbgsaveclient getnameclient killclient listclient pauseclient replyclient setnamecommandcommand countcommand getkeyscommand infoconfig getconfig resetstatconfig rewriteconfig setdbsizedebug objectdebug segfaultflushallflushdbinfolastsavemonitorrolesaveshutdownslaveofslowlogtimeSetssaddscardsdiffsdiffstoresintersinterstoresismembersmemberssmovespopsrandmembersremsscansunionsunionstoreSorted SetszaddzcardzcountzincrbyzinterstorezlexcountzrangezrangebylexzrangebyscorezrankzremzremrangebylexzremrangebyrankzremrangebyscorezrevrangezrevrangebylexzrevrangebyscorezrevrankzscanzscorezunionstoreStringsappendbitcountbitfieldbitopbitposdecrdecrbygetgetbitgetrangegetsetincrincrbyincrbyfloatmgetmsetmsetnxpsetexsetsetbitsetexsetnxsetrangestrlenTransactionsdiscardexecmultiunwatchwatch
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DECRBY key decrement

自1.0.0起可用。

时间复杂度: O(1)

递减存储在数key通过decrement。如果密钥不存在,则0在执行操作之前将其设置为。如果密钥包含错误类型的值或包含无法表示为整数的字符串,则会返回错误。该操作仅限于64位有符号整数。

有关增量/减量操作的额外信息,请参阅 INCR。

返回值

整数回复:key减量后的值

例子

redis>  SET mykey "10" "OK" redis>  DECRBY mykey 3 (integer) 7

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