---
layout: post
title: redis 4：redis set命令操作
category: 技术
tags:  Redis
keywords: 
description: redis之set命令的基本操作
---

{:toc}






### 1.添加一个或多个成员到set

	SADD key member [member ...]
	summary: Add one or more members to a set
	since: 1.0.0


```redis
127.0.0.1:6379> sadd set1 val1 val2 val3
(integer) 3
```




### 2.获取一个set的成员数量

	SCARD key
	summary: Get the number of members in a set
	since: 1.0.0
	

```redis
127.0.0.1:6379> scard set1
(integer) 3
```




### 3.查询在第一个set中但不在后续set中的成员，并返回

	SDIFF key [key ...]
	summary: Subtract multiple sets
	since: 1.0.0
	

```redis
127.0.0.1:6379> SMEMBERS set1
1) "val3"
2) "val4"
3) "val5"
4) "val2"
5) "val1"
127.0.0.1:6379> SMEMBERS set2
1) "val3"
2) "val4"
3) "val2"
127.0.0.1:6379> SDIFF set2 set1
(empty list or set)
127.0.0.1:6379> SDIFF set1 set2
1) "val5"
2) "val1"
```




### 4.查询key1中的成员但不在key2等后续key中的成员，并将获得的结果放在des-key中

	SDIFFSTORE des-key key1 [key2 ...]
	summary: Subtract multiple sets and store the resulting set in a key
	since: 1.0.0
	

```redis
127.0.0.1:6379> SDIFFSTORE set3 set1 set2
(integer) 2
127.0.0.1:6379> SMEMBERS set3
1) "val5"
2) "val1"
```




### 5.查询set中的重复项

	SINTER key [key ...]
	summary: Intersect multiple sets
	since: 1.0.0
	

```redis
127.0.0.1:6379> sinter set1 set2
1) "val3"
2) "val4"
3) "val2"
127.0.0.1:6379> sinter set2 set1
1) "val3"
2) "val4"
3) "val2"
```




### 6.查询set中的重复项，并放在目标set中

	SINTERSTORE des-key key [key ...]
	summary: Intersect multiple sets and store the resulting set in a key
	since: 1.0.0
	

```redis
127.0.0.1:6379> SINTERSTORE set4 set1 set2
(integer) 3
127.0.0.1:6379> SMEMBERS set4
1) "val3"
2) "val2"
3) "val4"
```




### 7.查询指定的成员是否在指定的key中(在返回1，不在返回0)

	SISMEMBER key member
	summary: Determine if a given value is a member of a set
	since: 1.0.0



### 8.查询set中所有的成员

	SMEMBERS key
	summary: Get all the members in a set
	since: 1.0.0
	

```redis
127.0.0.1:6379> SMEMBERS set4
1) "val3"
2) "val2"
3) "val4"
```




### 9.将set中的一个成员从set移到另一个set

	SMOVE source destination member
	summary: Move a member from one set to another
	since: 1.0.0
	

```redis
127.0.0.1:6379> smove set4 set3 val3
(integer) 1
127.0.0.1:6379> SMEMBERS set4
1) "val2"
2) "val4"
127.0.0.1:6379> SMEMBERS set3
1) "val3"
2) "val5"
3) "val1"
```




### 10.移除并返回随机的成员

	SPOP key
	summary: Remove and return a random member from a set
	since: 1.0.0


```redis
127.0.0.1:6379> SMEMBERS set3
1) "val3"
2) "val5"
3) "val1"
127.0.0.1:6379> spop set3
"val1"
127.0.0.1:6379> SMEMBERS set3
1) "val3"
2) "val5"
```




### 11.获取一个或多个随机成员(count指代获取的数目)

	SRANDMEMBER key [count]
	summary: Get one or multiple random members from a set
	since: 1.0.0
	

```redis
127.0.0.1:6379> SRANDMEMBER set3 2
1) "val3"
2) "val5"
```




### 12.移除set中的一个或多个成员

	SREM key member [member ...]
	summary: Remove one or more members from a set
	since: 1.0.0
	

```redis
127.0.0.1:6379> srem set3 val3 val4
(integer) 1  #只删除了val3,val4不存在所以返回1
```




### 13.添加多个sets，显示多个sets的结果，不重复

	SUNION key [key ...]
	summary: Add multiple sets
	since: 1.0.0


```redis
127.0.0.1:6379> SUNION set3 set4 set1
1) "val3"
2) "val5"
3) "val4"
4) "val2"
5) "val1"
```




### 14.连接多个set结果，并将结果存在目标set中

	SUNIONSTORE dest-key key [key ...]
	summary: Add multiple sets and store the resulting set in a key
	since: 1.0.0


```redis
127.0.0.1:6379> SUNIONstore  set6  set3 set4 set1
(integer) 5
```