## **DATA TYPES**

### **Redis Strings**

* SET: sets a value to a key
* GET: gets a value from a key
* DEL: deletes a key and its value
* INCR: atomically increments a key
* INCRBY: increments a key by a designated values
* EXPIRE: the length of time that a key should exist (denoted in seconds)

### Redis Lists - collection of ordered values

* LPUSH: Add a value to the beginning of a list
* RPUSH: Add a value to the end of a list
* LPOP: Get and remove the first element in a list
* RPOP: Get and remove the last element in a list
* LREM: Remove elements from a list
* LRANGE: Get a range of elements from a list
* LTRIM: Modifies a list so leave only a specified range
* LINDEX: Gets an element from a list by its index
* LLEN: Gets the length of a list

### Redis Sets - unordered collections of strings (can combine strings)

* SADD: Add one or members to a set
* SMEMBERS: Get all set members
* SINTER: Find the intersection of multiple sets
* SISMEMBER: check if a value is in a set
* SRANDMEMBER: Get a random set member
* SCARD: Gets the number of members in a set
* SDIFF(STORE): Subtracts multiple sets (and stores the resulting set in a key)
* SINTER(STORE): Intersects multiple sets (and stores the resulting set in a key)
* SUNION(STORE): Adds multiple sets (and stores the resulting set in a key)=

  
### Redis Sorted Sets - mix between a Set and a Hash

* ZADD: Adds members to a sorted set
* ZRANGE: Displays the members of a sorted set arranged by index (with the default low to high)
* ZREVRANGE: Displays the members of a sorted set arranged by index (from high to low)
* ZREM: Removes members from a sorted set
* ZCARD: Gets the number of members in a sorted set 
* ZRANK: Determines the index of a member in a sorted set  

  
  
  
### Redis Hashes - useful to represent objects with many fields

* HMSET: Sets up multiple hash values
* HSET: Sets the hash field with a string value
* HGET: Retrieves the value of a hash field
* HMGET: Retrieves all of the values for given hash fields
* HGETALL: Retrieves all of the values for in a hash