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Redis · Module 4 of 10

Hashes and sets

Hashes hold objects; sets hold unique members.

📖 Key ideas

  1. HSET user:42 name Asha city Erode stores fields of one object.
  2. HGET reads one field and HGETALL reads all fields.
  3. SADD adds unique members to a set; duplicates are ignored.
  4. SISMEMBER checks membership quickly.
  5. SINTER, SUNION and SDIFF compare sets, like common friends.
💡 Real-life example: A hash is a student ID card with several fields; a set is the attendance list where each name appears only once.
HSETSet fields of a hash
HGETALLRead every field of a hash
SADDAdd unique members to a set
SINTERMembers common to sets