One line of output is produced when rows are grouped.
Data are information that are gathered,which can be written in alphabetical or numeric.
This information can be arranged in rows to serve as demarcation, ordered structure or class.
Data in a row or several rows can be grouped into column. For data grouping by clause, the command will only allow for one grouping and restrict access for more than one grouping. It will therefore produce one output per line of output irrespective of the number of rows that are involved.
Therefore, One line of output is produced when rows are grouped.
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