FIRST_VALUE and LAST_VALUE often need an explicit frame. Why?

Problem Statement

Explanation

The default frame for ordered windows is RANGE BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW in many engines. With peers, that frame can include more rows than expected, and LAST_VALUE may not reflect the true last row in the partition. Set ROWS BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING to get the absolute first or last within the partition, or use CURRENT ROW for stepwise behavior.

Code Solution

SolutionRead Only

LAST_VALUE(amount) OVER (
  PARTITION BY product
  ORDER BY day
  ROWS BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING
) AS last_amt

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This question appears in the following practice sets:

Window Functions & Analytics

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FIRST_VALUE and LAST_VALUE often need an explicit frame. Why?

Problem Statement

Explanation

Code Solution

Practice Sets

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FIRST_VALUE and LAST_VALUE often need an explicit frame. Why?

Problem Statement

Explanation

Code Solution

Practice Sets

Related Questions

Which SQL statement retrieves all columns and rows from a table named employees?

Which clause filters rows before aggregation and affects which rows are grouped?

What is the default sort order when ORDER BY is used without ASC or DESC?

Which construct is commonly used to paginate results in SQL engines like Postgres and MySQL?

Which predicate correctly checks for missing values in standard SQL?

More from SQL & Databases

Master Interviews
Anywhere, Anytime