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LEADW

概述

返回当前行的下一行。

语法

分析表达式

LEADW(<table>,<expression> [,PARTITIONBY(<expression>[,[expression] [,...]])] ,ORDERBY(<expresion> [(ASC|DESC)] [,<expression> [(ASC|DESC)] [,...] ] ))

参数

参数	定义
table	进行计算的表。
expression	计算表达式。
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。

返回值

当前行的下一行。

示例

以 EnglishProductCategoryName 为分区条件，在 DimProduct 表的 ListPrice 列中进行计算，为每一行返回它下一行的值。

分析表达式

LEADW (
    'DimProduct',
    'DimProduct'[ListPrice],
    PARTITIONBY('DimProductCategory'[EnglishProductCategoryName]),
    ORDERBY('DimProduct'[ProductName])
)