redis commands intro commands

Commands Introduction

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5 Data Types

Initial play

Redis has 5 data types. They can be grouped into String and the rest.
String has a one-to-one relationship between key and value; the others are one-to-many.

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Strings

Initial set incr

Here are two representative String commands.
SET is the typical command to store a value, and INCR increments the value by 1.
Click the incr button repeatedly to see the number increase.
Query command: GET key

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Lists

Initial lpush rpop

List is used to store and process data in order.
LPUSH stores data in a list.   The first stored item is at the right end of the list, and the last stored item is at the left end.
RPOP pops data one by one from the right of the list.
Lists allow duplicate values.   Sets and Sorted Sets do not allow duplicates.
Query command: LRANGE key 0 -1

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Sets

Initial sadd

Set does not allow duplicate members. Even if you enter 'A' twice, only one remains.   Use Set for data with a set nature.
SADD is the command to store members.
Query command: SMEMBERS key

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Sets intersection

Initial sinter

Sets provide set operations. You can compute union, intersection, and difference.
Here we show intersection as a typical example.

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Sorted Sets

Initial zadd

Sorted Sets order members by score. As with Sets, duplicate members are not allowed.   Use Sorted Set when you need ordered data.
Query command: ZRANGE key 0 -1

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Sorted Sets union

Initial zunionstore

You can compute union and intersection, and operations using score are provided.

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Hashes

Initial hset hincrby

Hash provides a field name so values can be distinguished by name.   It is similar to a table in an RDB.
HSET is the typical Hash store command.
HINCRBY increments by a specified number.
Query command: HGETALL key

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Command summary

Category	SET	GET	POP	REM	INCR	Set operations
Strings	SET	GET	-	DEL	INCR	-
Lists	LPUSH	LRANGE	LPOP	LREM	-	-
Sets	SADD	SMEMBERS	SPOP	SREM	-	SUNION
ZSets	ZADD	ZRANGE	ZPOPMIN	ZREM	ZINCRBY	ZUNION
Hashes	HSET	HGET	-	HDEL	HINCRBY	-
Streams	XADD	XREAD	-	XDEL	-	-

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