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SQL Top Categories by Demographic
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SQL Top Categories by Demographic

MediumSQL · PostgreSQL

Problem

Write a SQL query using window functions to find the top three most popular Pin categories for each user demographic group.

Popularity is measured by the number of saved Pin interactions. Include only users with a known demographic group and return exactly three categories per group, breaking ties alphabetically by category.

Output

  1. One row per demographic group and category.
  2. Columns: demographic_group, category, save_count, and category_rank.
  3. Sort by demographic_group, category_rank, then category.

Schema

users
ColumnTypeDescription
user_idPKINTUnique Pinterest user identifier
demographic_groupVARCHAR(50)User demographic segment
pins
ColumnTypeDescription
pin_idPKINTUnique Pin identifier
categoryVARCHAR(100)Content category assigned to the Pin
pin_interactions
ColumnTypeDescription
interaction_idPKINTUnique interaction identifier
user_idINTUser who performed the interaction
pin_idINTPin involved in the interaction
interaction_typeVARCHAR(30)Interaction action, such as save or click
Tablesuserspinspin_interactions
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CodePostgreSQL
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