What are the basic data query commands in redis?

(1) key query

1. Query all keys

KEY *

2. Query the key containing a certain character

KEY *字符*

For example, query key containing the character chen is available

KEY *chen*

3. Query the type of key

TYPE key

4. Query whether a key exists

EXISTS key

(2) Query commands for 5 data types

1 .string query

1.1 Query the value of string type key

GET string_key

1.2 Query the length of string type key

STRLEN string_key

1.3 Query the value of multiple string type key

MGET string_key1 [string_key2........]

2.Hash query

2.1. Query a certain filed value of a single hash type key

HGET hash_key filed

2.2. Query multiple filed values ​​of a hash type key

HMGET hash_key filed1 [filed2.......]

2.3. Query all filed values ​​of hash type keys and their corresponding values

HGETALL hash_key

2.4. Query all filed values ​​of hash type keys

HKEYS hash_key

2.5. Query all filed values ​​of hash type keys

HVALS hash_key

2.6 Query the length of hash type key

HLEN hash_key

3.Set query

3.1.Query all elements of set type key

SMEMBERS set_key

3.2.Query the number of elements of set type key

SCARD set_key

4.zset query

4.1. Query the elements whose zset type key index is within a certain range

ZRNAGE zset_key start stop [withsocres]

4.2. Query the elements whose zset type key score is within a certain range

ZRNAGEBYSCORE zset_key start stop [withsocres]

5.list query

5.1.Query elements whose list type key index is within a certain range

LRANGE list_key start stop

5.2.Query a certain index value of list type key

LINDEX list_key index

5.3. Query the length of list type key

LLEN list_key

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