Redis of NoSQL (under data type)

1.set Typ

(1) order

① adds elements

Syntax: SADD key member [member...]

② delete element

Syntax: SREM key member [member...]

③ gets all the elements in the collection

Syntax: SMEMBERS key

④ determines whether the element is in the collection

Syntax: SISMEMBER key member

(2) Operation commands of sets

① difference set

Syntax: SDIFF key [key...]

② intersection

Syntax: SINTER key [key...]

③ union

Syntax: SUNION key [key...]

(3) Enhancement order

① gets the number of elements in the collection

Syntax: SCARD key

② randomly pops an element from the collection

Syntax: SPOP key

2. Sortedset

(1) introduction: sortedset is an ordered set, which can be sorted, but the only difference between sortedset and set is that sortedset adds a score to the element, and then sorts it by score.

(2) order

① adds elements

Syntax: ZADD key score member [score member...]

② gets the score of the element

Syntax: ZSCORE key member

③ delete element

Syntax: ZREM key member [member...]

④ gets a list of elements ranked in a certain range

Note: all elements indexed from start to stop are returned in the order of element scores.

Syntax: ZRANGE key start stop [WITHSCORES]

Returns all elements indexed from start to stop in the order of element scores from high to low

Syntax: ZREVRANGE key start stop [WITHSCORES]

Rank elements and get scores

⑤ gets the ranking of elements:

From small to big:

Syntax: ZRANK key member

From big to small

Syntax: ZREVRANK key member

(2) Enhancement order

① gets the elements between the specified scores

Syntax: ZRANGEBYSCORE key min max [WITHSCORES] [LIMIT offset count]

② increases the score of an element

Syntax: ZINCRBY key increment member

③ gets the number of elements in the collection

Syntax: ZCARD key

④ deletes elements according to the range of rankings

Syntax: ZREMRANGEBYRANK key start stop

⑤ deletes elements by score range