When performing a grouping operation,the SQL standard specifies that all rows with null values are grouped together.

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Quizplus · Accepted Answer

This is true. When grouping in SQL, any rows with null values will be placed into a single group. For example, if you were grouping by a column with three distinct values and some rows had null values in that column, those null rows would all be grouped together as a separate "null" group.

When Performing a Grouping Operation,the SQL Standard Specifies That All