Section: CTEs and window functions

Use a CTE to stage a subquery

sql
sql
WITH recent_posts AS (
  SELECT * FROM posts WHERE created_at >= date('now', '-7 day')
)
SELECT COUNT(*) FROM recent_posts;
Explanation

CTEs improve readability for multi-step transformations.

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Same sheet · prioritizing CTEs and window functions
Use a recursive CTE
Walk a hierarchy such as categories or folders.
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Assign row numbers
Rank rows within an ordered result.
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Compute a running total
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Rank rows by score
Assign rank values with ties.
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Use an INNER JOIN
Return rows that match in both tables.
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Use a LEFT JOIN
Keep parent rows even if the child is missing.
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