List.Distinct

傳回移除重複項之後的值清單。

Syntax

List.Distinct(
    list as list,
    optional equationCriteria as any
) as list

Remarks

傳回包含指定清單中所有值並移除重複項目的清單。如果指定的清單為空白，則結果為空白清單。

• list: 要從中擷取相異值的清單。
• equationCriteria: (選擇性) 指定在比較值時，判斷相等性的方式。此參數可以是金鑰選取器函數、比較器函數，或同時包含金鑰選取器和比較器的清單。

Examples

Example #1

移除清單 {1, 1, 2, 3, 3, 3} 中的重複項。

List.Distinct({1, 1, 2, 3, 3, 3})

Result:

{1, 2, 3}

Example #2

從清單尾端開始，選取具有唯一文字長度的水果。

let
    Source = {"Apple", "Banana", "Cherry", "Date", "Fig"},
    Result = List.Distinct(List.Reverse(Source), each Text.Length(_))
in
    Result

Result:

{"Fig", "Date", "Cherry", "Apple"}

Example #3

從清單開頭開始，選取不重複的水果，並忽略大小寫。

let
    Source = {"apple", "Pear", "aPPle", "banana", "ORANGE", "pear", "Banana", "Cherry"},
    Result = List.Distinct(Source, Comparer.OrdinalIgnoreCase)
in
    Result

Result:

{"apple", "Pear", "banana", "ORANGE", "Cherry"}

Example #4

從一個清單集合中擷取那些包含唯一國家名稱的前幾個清單，並忽略大小寫。將擷取的清單放入新資料表的資料列中。

let
    Source = {
        {"USA", #date(2023, 8, 1), 567},
        {"canada", #date(2023, 8, 1), 254},
        {"Usa", #date(2023, 7, 1), 450},
        {"CANADA", #date(2023, 6, 1), 357},
        {"Panama", #date(2023, 6, 2), 20},
        {"panama", #date(2023, 7, 1), 40}
    },
    DistinctByCountry = List.Distinct(
        Source,
        {each _{0}, Comparer.OrdinalIgnoreCase}
    ),
    ToTable = Table.FromRows(DistinctByCountry, {"Country", "Date", "Value"}),
    ChangeTypes = Table.TransformColumnTypes(
        ToTable, {{"Country", type text}, {"Date", type date}, {"Value", Int64.Type}}
    )
in
    ChangeTypes

Result:

#table(type table[Country = text, Date = date, Value = Int64.Type],
{
    {"USA", #date(2023, 8, 1), 567},
    {"canada", #date(2023, 8, 1), 254},
    {"Panama", #date(2023, 6, 2), 20}
})

Category

List.Selection