/*以FoodPrice列排序并显示排序后的行号*/
SELECT ROW_NUMBER() OVER(ORDER BY FoodPrice DESC) AS RowId,* FROM dbo.Food
ROW_NUMBER()
/*以FoodType分组，然后以FoodPrice排序并显示所在分组的相应行号*/
SELECT ROW_NUMBER() OVER(PARTITION BY FoodType ORDER BY FoodPrice DESC) AS RowId,* FROM dbo.Food
RANK()
/*以FoodType分组，然后以FoodPrice排序并显示所在分组的相应行号，如果排序字段字相等则显示相同的行号，
并跳过所在的真实行号*/
SELECT RANK() OVER(PARTITION BY FoodType ORDER BY FoodPrice) AS RowID,* FROM dbo.Food
DENSE_RANK()
/*以FoodType分组，然后以FoodPrice排序并显示所在分组的相应行号，如果排序字段字相等则显示相同的行号，
忽略相同行号，依次递增*/
SELECT DENSE_RANK() OVER(PARTITION BY FoodType ORDER BY FoodPrice) AS RowID,* FROM dbo.Food