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Handling Conflicts in a Hash Table
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Handling Conflicts in a Hash Table

EasySQL · PostgreSQL

Problem

How do you deal with conflicts in a hash table?

Asked in the recruiter phone screen stage. CS trivia asked by recruiter.

Output

  1. One row per hash table bucket that contains at least one key
  2. Columns: bucket_id, collision_count, collision_strategy
  3. Ignore rows where bucket_id is NULL
  4. Sort by bucket_id ascending

Schema

hash_table_entries
ColumnTypeDescription
entry_idPKINTUnique identifier for the inserted key
bucket_idINTBucket index assigned by the hash function
key_valueVARCHAR(50)Stored key
strategyVARCHAR(30)Collision handling strategy used for the bucket
Tableshash_table_entries
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