Table.SelectColumns

Syntax

Table.SelectColumns(
    table as table,
    columns as any,
    optional missingField as nullable number
) as table

About

Returns the table with only the specified columns.

• table: The provided table.
• columns: The list of columns from the table table to return. Columns in the returned table are in the order listed in columns.
• missingField: (Optional) What to do if the column does not exist. Example: MissingField.UseNull or MissingField.Ignore.

Example 1

Only include column [Name].

Usage

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"
)

Output

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

Example 2

Only include columns [CustomerID] and [Name].

Usage

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

Output

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

Example 3

If the included column does not exist, the default result is an error.

Usage

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

Output

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

Example 4

If the included column does not exist, option MissingField.UseNull creates a column of null values.

Usage

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

Output

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