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Table.SelectColumns

Tiek atgriezta tabula tikai ar norādītajām kolonnām.

Syntax​

Table.SelectColumns(
    table as table,
    columns as any,
    optional missingField as MissingField.Type
) as table

Remarks​

Tiek atgriezta table tikai ar norādīto columns.

  • table: Norādītā tabula.
  • columns: kolonnu saraksts no tabulas table, ko atgriezt. Kolonnas atgrieztajā tabulā ir secībā, kas norādīta columns.
  • missingField: (Neobligāti) Kā rīkoties, ja kolonna nepastāv. Piemērs: MissingField.UseNull vai MissingField.Ignore.

Examples​

Example #1​

Ietvert tikai kolonnu [Name].

Table.SelectColumns(
    Table.FromRecords({
        [CustomerID = 1, Name = "Bob", Phone = "123-4567"],
        [CustomerID = 2, Name = "Jim", Phone = "987-6543"],
        [CustomerID = 3, Name = "Paul", Phone = "543-7890"],
        [CustomerID = 4, Name = "Ringo", Phone = "232-1550"]
    }),
    "Name"
)

Result:

Table.FromRecords({
    [Name = "Bob"],
    [Name = "Jim"],
    [Name = "Paul"],
    [Name = "Ringo"]
})

Example #2​

Ietvert tikai kolonnas [CustomerID] un [Name].

Table.SelectColumns(
    Table.FromRecords({[CustomerID = 1, Name = "Bob", Phone = "123-4567"]}),
    {"CustomerID", "Name"}
)

Result:

Table.FromRecords({[CustomerID = 1, Name = "Bob"]})

Example #3​

Ja ietvertā kolonna nepastāv, pēc noklusējuma tiek atgriezta kļūda.

Table.SelectColumns(
    Table.FromRecords({[CustomerID = 1, Name = "Bob", Phone = "123-4567"]}),
    "NewColumn"
)

Result:

[Expression.Error] The field 'NewColumn' of the record wasn't found.

Example #4​

Ja ietvertā kolonna nepastāv, izmantojot opciju MissingField.UseNull, tiek izveidota kolonna ar vērtībām Null.

Table.SelectColumns(
    Table.FromRecords({[CustomerID = 1, Name = "Bob", Phone = "123-4567"]}),
    {"CustomerID", "NewColumn"},
    MissingField.UseNull
)

Result:

Table.FromRecords({[CustomerID = 1, NewColumn = null]})

Category​

Table.Column operations