Redis Learning Note (12)--redis common operation instruction (iii)

Set set common operations directives

Set is a single-valued, multi-value data structure that does not allow the same elements to exist
Sadd key value [value]

Adding elements to form the association of key and value

Note that if we enter a value with duplicate content, Redis will automatically remove the weight and add it to the collection as shown below

Smembers Key

View collection elements

SCard Key

Gets the number of elements in the collection

Srem Key value

Removing elements from a collection

Srandmember key [Count]

Get multiple values randomly from the collection, without adding a number, by default randomly fetching a number, if the set number exceeds the number of data in the collection, then all out

Spop key [Count]

Random out stack, default random stack one number

Smove Key1 Key2 value1

Assign a value in Key1 to Key2
Here we move the 12 in the MySet to the myset01
Math Set Class Difference Set

Sdiff key1 Key2 [key 3]

Inside the first element and no longer behind any of the collections.
intersection

Sinter key1 Key2 [Key3]

and set

Sunion key1 Key2 [Key3]