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## 2. Simple key-value types
Insert a key and a value.
```sql
127.0.0.1:6379> set mykey somevalue
```
```output
"OK"
```
Query the value by the key.
```sql
127.0.0.1:6379> get mykey
```
```output
"somevalue"
```
Check if the key exists.
```sql
127.0.0.1:6379> exists mykey
```
```output
(integer) 1
```
If the value is a number, it can be incremented.
```sql
127.0.0.1:6379> set counter 100
```
```output
"OK"
```
```sql
127.0.0.1:6379> incr counter
```
```output
(integer) 101
```
```sql
127.0.0.1:6379> incr counter
```
```output
(integer) 102
```
```sql
127.0.0.1:6379> get counter
```
```output
"102"
```
## 3. Hash data types
You can create a Redis Hash data type as follows. This models the data for user id 1000 with the following attributes: `{username : john, birthyear : 1977, verified : 1}`.
```sql
127.0.0.1:6379> hmset user:1000 username john birthyear 1977 verified 1
```
```output
"OK"
```
You can retrieve specific attributes for user id 1000 as follows.
```sql
127.0.0.1:6379> hget user:1000 username
```
```output
"john"
```
```sql
127.0.0.1:6379> hget user:1000 birthyear
```
```output
"1977"
```
You can fetch multiple attributes with a single command as follows.
```sql
127.0.0.1:6379> hmget user:1000 username birthyear no-such-field
```
```output
1) "john"
2) "1977"
3) (nil)
```
You can fetch all attributes by using the `hgetall` command.
```sql
127.0.0.1:6379> hgetall user:1000
```
```output
1) "birthyear"
2) "1977"
3) "username"
4) "john"
5) "verified"
6) "1"
```