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计算一组行中每一列的名次值 。
分析表达式
DENSERANKW(<table>[,PARTITIONBY(<expression>[,[expression] [,...]])] ,ORDERBY(<expresion> [(ASC|DESC)] [,<expression> [(ASC|DESC)] [,...] ] ))
参数 | 定义 |
---|---|
table | 进行计算的表,该表包含计算表达式的行。 |
PARTITION BY 子句 | 将查询结果集划分为多个分区。 窗口函数分别应用于每个分区,并为每个分区重新启动计算。 如果未指定 PARTITION BY,则此函数将查询结果集的所有行视为单个分区。 |
ORDER BY 子句 | 定义结果集的每个分区内行的逻辑顺序。 也就是说,它指定了执行窗口函数计算的逻辑顺序。 如果未指定,则默认顺序为 ASC,且开窗函数将使用分区中的所有行。 |
返回一个整数。
以 DimProductCategory 表的 EnglishProductCategoryName列进行分片,在DimProduct 表中进行滑窗运算。
返回当前行在当前以及之前行中的排名。
分析表达式
DENSERANKW
(
'DimProduct',
PARTITIONBY('DimProductCategory'[EnglishProductCategoryName]),
ORDERBY('DimProduct'[ProductName])
)
该函数在排序相同的情况下会出现并列情况。例如:1,1,2。