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Average Citation Count by Time

MediumSQL · PostgreSQL00:00
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Your question is Average Citation Count by Time. Start with the requirements and the two tables on the right.

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Problem

Elsevier analytics teams need to assess citation activity for papers published within a defined time frame. Write a PostgreSQL query that calculates each paper's citation count and the overall average citation count per paper using a window function.

Requirements

  1. Include only papers published from 2023-01-01 through 2024-12-31.
  2. Include papers with zero citations.
  3. Return one row per paper with its citation count and the same overall average across all papers in the time frame.
  4. Sort results by publication date, then paper ID.

Schema

papers
ColumnTypeDescription
paper_idPKINTUnique identifier for the paper
titleVARCHAR(200)Title of the paper
publication_dateDATEDate the paper was published
citations
ColumnTypeDescription
citation_idPKINTUnique identifier for a citation record
paper_idINTIdentifier of the cited paper
citation_dateDATEDate the citation was recorded
citation_sourceVARCHAR(50)Source that supplied the citation record
Tablespaperscitations
Your solutionPostgreSQL
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