All 7 Hashes in Redis questions
More in Hashes in Redis
How do you retrieve a single field or all fields from a Redis hash? How do you atomically increment a numeric field within a Redis hash? How do you check if a specific field exists within a hash, and how do you delete just one field without affecting the rest of the hash? How do you retrieve only the field names or only the values from a Redis hash, without needing both together? How would you decide between storing an object as a single JSON string versus as a native Redis hash, considering both memory usage and access patterns? How does the internal listpack encoding for small hashes affect memory usage, and at what point does Redis switch to a different, less compact encoding?
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Redis › Hashes in Redis

What is a Redis hash, and how do you create one to store a simple object with multiple fields?

Beginner

Answer

A Redis hash lets you store several field value pairs under a single key, similar to a small dictionary or object, using the HSET command to set one or more fields at once, which is a natural way to represent something like a user profile with multiple attributes.
HSET user:100 name 'Sarah' email 'sarah@example.com' age 29
Real-world example A user management system stores a user's name, email, and age together under a single hash key, keeping all of that related profile information organized in one place rather than as separate top level keys.

Common follow-ups: Can you set multiple fields in a single HSET command?;What happens if you call HSET on a field that already exists?

Data Types;Redis Memory Optimization
All 7 Hashes in Redis questions