SQL allows us to $[$merge$/$ partition$/$concatenate$]$ relation into $[$ bytes$/$groups$/$columns$]$ according to the value$($s$)$ of one or more attributes, listed in the group by section of the query. Unless $[$ a capitalized keyword$/$ an aggregate function$/$ a database client$]$ is used, all other attributes in the $[$ WHEN$/$SELECT$/$FROM$]$clause must appear in the grouping$-$list.

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