Vitality Metrics: Most Language Links

This query is marked as a draft This query has been published by Zar2gar1.

This query simply finds the pages with the most language links and provides a count.

Because of how the database indices are set up, we don't attempt to join with the page table at all.

SQL

# Set a query timeout for politeness
SET STATEMENT max_statement_time = 300 FOR

# Indices don't allow for an efficient join ...
# ... so we'll just grab page IDs for now
SELECT
  ll_from AS "Page ID",

  # OPTIMIZATION: Apply COUNT as a window function
  COUNT(*) OVER (PARTITION BY ll_from)
    AS "Number of Translations"

FROM langlinks

# Ordering on a COUNT should be OK
GROUP BY 1 ORDER BY 2 DESC
# TESTING: Start with a small limit to gauge time
LIMIT 1000;

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