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该函数提供对跟随当前行的给定物理偏移量之后的行的值进行访问的功能。如果没有这样的行,将返回默认值。它不接受窗口帧定义,如FRAMEROWS和FRAMERANGE。
LEAD(value_function, [offset_value], [default_value])
该函数提供以下参数。
参数 | 描述 |
---|---|
value_function | [必选] 字段名或公式。 |
[offset_value] | [可选] 当前行之后的行偏移量,offset = 1。 偏移量应为非负整数。如果为0,则对当前行评估value_function。 |
[default_value] | [可选] 默认值,默认为null |
// WINDOW(LEAD([@city]), ORDERBY([sold]))
城市 | 销售额 | lead
----------------------------------------------
Paris 100 Berlin
Berlin 150 Rome
Rome 200 Moscow
Moscow 200 London
London 300 null
// WINDOW(LEAD([@city], 2), ORDERBY([sold]))
城市 | 销售额 | lead
----------------------------------------------
Paris 100 Rome
Berlin 150 Moscow
Rome 200 London
Moscow 200 null
London 300 null