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Computer science · University

SELECT, filtering and sorting · revision notes

A query clause that specifies values to return.

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Key ideas and conditions

SELECT

A query clause that specifies values to return.

WHERE

A clause that filters rows using a condition.

ORDER BY

A clause that defines the requested result ordering.

Aggregate

A calculation such as COUNT or SUM that summarizes multiple rows.

Explain without looking

  1. Give a short example showing how ORDER BY would be used in practice.
  2. Summarize why Aggregate matters in the lesson “SELECT, filtering and sorting”.

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