Table.TransformColumns
This topic applies to the Power Query Formula Language which can be used with Power Query and Power BI Desktop to build queries that mashup data. See the list of function categories.
Transforms columns from a table using a function.
Table.TransformColumns(table as table, transformOperations as list, optional defaultTransformation as nullable function, optional missingField as nullable number) as table
| Argument | Description |
|---|---|
| table | The Table to modify. |
| transformOperations | The list of transformOperations to run. |
| optional defaultTransformation | The default table transformation. |
| optional missingField | Missing field value. |
- Table.TransformColumns is similar to Record.TransformFields applied to every row in a table.
Table.TransformColumns(
Table.FromRecords({[A="1", B=2], [A="5", B=10]}),
{"A", Number.FromText})
equals Table.FromRecords({[A=1,B=2], [A=5,B=10]})
Table.TransformColumns(
Table.FromRecords({[A="1",B=2], [A="5", B=10]}),
{{"A", Number.FromText},
{"B", each _ + 1}})
equals Table.FromRecords({[A=1,B=3], [A=5,B=11]})
Table.TransformColumns(
Table.FromRecords({[A="1",B=2], [A="5", B=10]}),
{"X", Number.FromText})
equals Expression.Error
Table.TransformColumns(
Table.FromRecords({[A="1",B=2], [A="5", B=10]}),
{"X", Number.FromText},
MissingField.Ignore)
equals Table.FromRecords({[A="1",B=2], [A="5",B=10]})
Table.TransformColumns(
Table.FromRecords({[A="1",B=2], [A="5", B=10]}),
{"X", Number.FromText},
MissingField.UseNull)
equals Table.FromRecords({[A="1",B=2,X=/* Expression.Error*/],
[A="5",B=10,X=/* Expression.Error error*/]})
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