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DECR key

相关命令

始于1.0.0可用。

时间复杂度： O(1)

Decrements the number stored at key by one. If the key does not exist, it is set to 0 before performing the operation. An error is returned if the key contains a value of the wrong type or contains a string that can not be represented as integer. This operation is limited to 64 bit signed integers.

See INCR for extra information on increment/decrement operations.

返回值

Integer reply: the value of key after the decrement

例子

redis> SET mykey "10" 

  1. OK

redis> DECR mykey 

  1. (integer) 9

redis> SET mykey "234293482390480948029348230948" 

  1. OK

redis> DECR mykey 

  1. ERR value is not an integer or out of range
redis>

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