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make_set()（聚合函数）

  • 项目

适用于：✅Microsoft Fabric✅Azure 数据资源管理器Azure Monitor✅Microsoft✅ Sentinel

创建一个 dynamic 数组，其中包含 expr 在组中提取的非重复值集。

空值会被忽略，不会纳入计算中。

注意

此函数与 summarize 运算符结合使用。

弃用的别名：makeset()

语法

make_set(expr [, maxSize])

详细了解语法约定。

参数

客户 类型​​ 必需 说明
expr string ✔️ 用于聚合计算的表达式。
maxSize int 返回的最大元素数目。 默认值和最大值为 1048576。

注意

已弃用版本的默认 maxSize 限制为 128。

返回

返回一个 dynamic 数组，其中包含 expr 在组中提取的非重复值集。 数组的排序顺序未定义。

提示

若要仅对非重复值进行计数，请使用 dcount() 或 count_distinct()。

示例

从标量列设置

以下示例显示了按相同作物损失价值分组的一组州。

StormEvents 
| summarize states=make_set(State) by DamageCrops

显示的结果表仅包括前 10 行。

损害农作物 states
0 ["NORTH CAROLINA","WISCONSIN","NEW YORK","ALASKA","DELAWARE","OKLAHOMA","INDIANA","ILLINOIS","MINNESOTA","SOUTH DAKOTA","TEXAS","UTAH","COLORADO","VERMONT","NEW JERSEY","VIRGINIA","CALIFORNIA","PENNSYLVANIA","MONTANA","WASHINGTON","OREGON","HAWAII","IDAHO","PUERTO RICO","MICHIGAN","FLORIDA","WYOMING","GULF OF MEXICO","NEVADA","LOUISIANA","TENNESSEE","KENTUCKY","MISSISSIPPI","ALABAMA","GEORGIA","SOUTH CAROLINA","OHIO","NEW MEXICO","ATLANTIC SOUTH","NEW HAMPSHIRE","ATLANTIC NORTH","NORTH DAKOTA","IOWA","NEBRASKA","WEST VIRGINIA","MARYLAND","KANSAS","MISSOURI","ARKANSAS","ARIZONA","MASSACHUSETTS","MAINE","CONNECTICUT","GUAM","HAWAII WATERS","AMERICAN SAMOA","LAKE HURON","DISTRICT OF COLUMBIA","RHODE ISLAND","LAKE MICHIGAN","LAKE SUPERIOR","LAKE ST CLAIR","LAKE ERIE","LAKE ONTARIO","E PACIFIC","GULF OF ALASKA"]
30000 ["TEXAS","NEBRASKA","IOWA","MINNESOTA","WISCONSIN"]
4000000 ["CALIFORNIA","KENTUCKY","NORTH DAKOTA","WISCONSIN","VIRGINIA"]
3000000 ["CALIFORNIA","ILLINOIS","MISSOURI","SOUTH CAROLINA","NORTH CAROLINA","MISSISSIPPI","NORTH DAKOTA","OHIO"]
14000000 ["CALIFORNIA","NORTH DAKOTA"]
400000 ["CALIFORNIA","MISSOURI","MISSISSIPPI","NEBRASKA","WISCONSIN","NORTH DAKOTA"]
50000 ["CALIFORNIA","GEORGIA","NEBRASKA","TEXAS","WEST VIRGINIA","KANSAS","MISSOURI","MISSISSIPPI","NEW MEXICO","IOWA","NORTH DAKOTA","OHIO","WISCONSIN","ILLINOIS","MINNESOTA","KENTUCKY"]
18000 ["WASHINGTON","WISCONSIN"]
107900000 ["CALIFORNIA"]
28900000 ["CALIFORNIA"]

从数组列设置

以下示例显示了数组中的元素集。

datatable (Val: int, Arr1: dynamic)
[
    1, dynamic(['A1', 'A2', 'A3']), 
    5, dynamic(['A2', 'C1']),
    7, dynamic(['C2', 'A3']),
    5, dynamic(['C2', 'A1'])
] 
| summarize Val_set=make_set(Val), Arr1_set=make_set(Arr1)
Val_set Arr1_set
[1,5,7] ["A1","A2","A3","C1","C2"]

相关内容

  • 将 mv-expand 运算符用于相反的函数。
  • make_set_if 运算符与 make_set 相似，只是它也接受谓词。