Redis deletes the specified element in the specified key

------------------------Delete the specified key------------- ---------

127.0.0.1:6379> keys *

 1) "_kombu.binding.celery.pidbox"
 2) "_kombu.binding.celery"
 3) "_kombu.binding.celeryev"
 4) "key"
 5) "db_number"
 6) "myhash"
 7) "key1"
 8) "data_string"
 9) "data_list"
10) "set1"

127.0.0.1:6379> del key
(integer) 1
127.0.0.1:6379> keys *
1) "_kombu.binding.celery.pidbox"
2) "_kombu.binding.celery"
3) "_kombu.binding.celeryev"
4) "db_number"
5) "myhash"
6) "key1"
7) "data_string"
8) "data_list"

9) "set1"

------------------------Delete the specified element from the list---------------------- -----------
127.0.0.1:6379> lrange data_list 0 10 Display the data of the specified key
1) "test_function"
2) "rabbitmq"
3) "haha"
4) "redis"
127.0.0.1: 6379> lrem data_list 0 test_function# delete the string
(integer) whose value is test_function 1 display the data of the specified key
127.0.0.1:6379> lrange data_list 0 10 display the data of the specified key
1) "rabbitmq"
2) "haha"
3) "redis"


--------------------Hash Key delete key value---------------------- ---------------------------
127.0.0.1:6379> HGETALL myhash
1) "field1"
2) "Hello"
3) "field2"
4) "World"
127.0.0.1:6379> HDEL myhash field1 hello
(integer) 1
127.0.0.1:6379> HGETALL myhash
1) "field2"
2) "World"


--------------------------string remove element--- ----------------------------------------
When the key of string type is setting data, The previous data will be overwritten, so it is equivalent to deleting the original data.
127.0.0.1:6379> set data_string republic
OK
127.0.0.1:6379> get data_string
"republic"
127.0.0.1:6379> 






----- -------------------set remove element---------------------------- ---------------
127.0.0.1:6379> SMEMBERS set1
1) "mongodb"
2) "redis"
3) "yuchiappleyuchi"
127.0.0.1:6379> SREM set1 yuchiappleyuchi
(integer) 1
127.0.0.1:6379> SMEMBERS set1
1) "mongodb"
2) "redis"