Is the GROUP BY executed following the operations executed in the SELECT statement in BigQuery?

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No, in BigQuery, the GROUP BY is executed before the operations specified in the SELECT statement. The query is executed in the following order:

1. FROM clause
2. WHERE clause
3. GROUP BY clause
4. SELECT clause
5. HAVING clause
6. ORDER BY clause

This order of execution is important to understand when writing complex queries that include multiple clauses.