redis decrby命令

DECRBY key decrement

Decrements the number stored at key by decrement.
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”

"OK"

redis>  DECRBY mykey 3

(integer) 7
redis>