Auto set all column types to specific Data Type

[Anonymous]

Hello,

I have the following table loaded in Power Query which is updated every week with new or removed or renamed columns in the source Excel spreadsheet. I am trying to find a dynamic way to change the Data Type of all the columns so that it will always be "Whole Number" without having to do this manually. The problem is that when it is autodetected, the data type is sometimes set to decimal. Can this be solved automatically?

Year	Week number	Stock	Returns	Defective
2022	1	3	4	8
2022	2	6	9	17
2022	3	2	5	10
2022	4	9	3	16
2022	5	5	6	15
2023	6	2	2	10
2022	7	7	8	22
2022	8	3	3	13
2022	9	6	3	18
2022	10	3	3	14
2022	11	2	7	17
2022	12	3	7	22
2022	13	7	5	19
2022	14	9	8	18
2022	15	6	7	16
2022	16	7	14	34

[AlexisOlson · Accepted solution]

Doing this manually generates M code that looks like

= Table.TransformColumnTypes(Source,{{"Year", Int64.Type}, {"Week number", Int64.Type}, {"Stock", Int64.Type}, {"Returns", Int64.Type}, {"Defective", Int64.Type}})

We can make this dynamic by transforming the list of column names into a list of {"ColumName", Int64.Type}.

= Table.TransformColumnTypes(Source, List.Transform(Table.ColumnNames(Source), each {_, Int64.Type}))

This should work for any number of integer columns.