Question: What is the effect of using the COUNT ( column _ name ) function in a query with a GROUP BY clause? It counts all

What is the effect of using the COUNT(column_name) function in a query with a GROUP BY clause?
It counts all rows in each table
It counts all rows in each group
It counts only the first row in each group.
It counts only the unique rows in each group.
What is the effect of using the COUNT ( column _

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