select id, dept, sal, row_number() over (partition by dept order by sal desc) from emp; ID DEPT SAL ROW_NUMBER()OVER 部門別のようにグループ単位で行番号を割り当てるために、partition by によってグループ化するカラムを指定しています。 DISTINCTとrow_numberを合わせて使うとDISINCTの前にrow_numberが行われるためか、同じレコードで違う連番が振られてしまう。 The function assigns a sequential unique number: to each row to which it is applied (either each row in the partition or each row returned by the query) in the ordered sequence of rows specified in the order_by_clause, beginning with 1. ROW_NUMBER SQL Serverの「ROW_NUMBER」は、SELECTした結果に連番・順位を振ります。「ROW_NUMBER」の使い方を解説します。 ROW_NUMBERの使い方 ROW_NUMBER() OVER(ORDER BY {並びかえる ROW_NUMBER clause starts numbering from 1. Функция ROW_NUMBER, как следует из ее названия, нумерует строки, возвращаемые запросом. This can also work in SQL Server . In addition, it uses the ROW_NUMBER() function to add sequential integer number to each row. Можно выполнить более сложное упорядочивание строк в отчете, чем то, которое дает предложение ORDER BY рамках... 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