Skip to main content
cancel
Showing results for 
Search instead for 
Did you mean: 

Find everything you need to get certified on Fabric—skills challenges, live sessions, exam prep, role guidance, and more. Get started

Reply
Licantrop0
Microsoft Employee
Microsoft Employee

Split table in multiple tables by blank rows

I have a single CSV file that is actually separate tables.

The tables are separate by a blank row, after which there is a new header:

Licantrop0_1-1598451641609.png

 

The number of rows in each sub-table may change, so I cannot use "keep first N rows".

 

I need a function to split this table into multiple tables whenever there is a blank row.

Or at least an M function to tell me what is the first blank row number so I can use it as parameter of the Table.Skip function.

 

Thanks for any help!

1 ACCEPTED SOLUTION

Hi @Licantrop0 ,

 

you can create a staging table that holds the partitions to be referenced by further queries.

Please paste the following code into the advanced editor and follow the steps:

 

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45W8khNTEktMlTSgbKMgCylWJ1oJZCQMYwDEjWBcUA0lIlNN4RljGKIKYopZhA5AyDTCEQYG6Cb65iXX5KRWqSQATYLScIQiW0EY8cCAA==", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [Column1 = _t, Column2 = _t, Column3 = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"Column1", type text}, {"Column2", type text}, {"Column3", type text}}),
    #"Added Index" = Table.AddIndexColumn(#"Changed Type", "Index", 0, 1, Int64.Type),
    #"Added Custom" = Table.AddColumn(#"Added Index", "Custom", each if [Column1] = "" then [Index] else null),
    #"Filled Down" = Table.FillDown(#"Added Custom",{"Custom"}),
    #"Removed Columns" = Table.RemoveColumns(#"Filled Down",{"Index"}),
    #"Filtered Rows" = Table.SelectRows(#"Removed Columns", each ([Column1] <> "")),
    #"Grouped Rows" = Table.Group(#"Filtered Rows", {"Custom"}, {{"All", each _, type table [Column1=nullable text, Column2=nullable text, Column3=nullable text, Custom=nullable number]}})
in
    #"Grouped Rows"

 

Imke Feldmann (The BIccountant)

If you liked my solution, please give it a thumbs up. And if I did answer your question, please mark this post as a solution. Thanks!

How to integrate M-code into your solution -- How to get your questions answered quickly -- How to provide sample data -- Check out more PBI- learning resources here -- Performance Tipps for M-queries

View solution in original post

5 REPLIES 5
TheBoojum
Frequent Visitor

I know this is a slightly old post, but I had a similar problem and found this article which gives a very good way of flagging empty rows:

https://www.thebiccountant.com/2016/03/08/select-rows-that-have-no-empty-fields-using-expression-eva... 

 

There is a really neat approach documented in the comments:

 

= Table.SelectRows(Source, each List.AllTrue(List.Transform(Record.FieldValues(_), (fieldVal) => fieldVal <> null)))

- just add a new column with the code after 'each' and change the '<> null' to '= null'.

 

Having identified the null rows, you can play around with indices to split the data as required.

amitchandak
Super User
Super User

@ImkeF , can you help on this

Hi @Licantrop0 ,

 

you can create a staging table that holds the partitions to be referenced by further queries.

Please paste the following code into the advanced editor and follow the steps:

 

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45W8khNTEktMlTSgbKMgCylWJ1oJZCQMYwDEjWBcUA0lIlNN4RljGKIKYopZhA5AyDTCEQYG6Cb65iXX5KRWqSQATYLScIQiW0EY8cCAA==", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [Column1 = _t, Column2 = _t, Column3 = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"Column1", type text}, {"Column2", type text}, {"Column3", type text}}),
    #"Added Index" = Table.AddIndexColumn(#"Changed Type", "Index", 0, 1, Int64.Type),
    #"Added Custom" = Table.AddColumn(#"Added Index", "Custom", each if [Column1] = "" then [Index] else null),
    #"Filled Down" = Table.FillDown(#"Added Custom",{"Custom"}),
    #"Removed Columns" = Table.RemoveColumns(#"Filled Down",{"Index"}),
    #"Filtered Rows" = Table.SelectRows(#"Removed Columns", each ([Column1] <> "")),
    #"Grouped Rows" = Table.Group(#"Filtered Rows", {"Custom"}, {{"All", each _, type table [Column1=nullable text, Column2=nullable text, Column3=nullable text, Custom=nullable number]}})
in
    #"Grouped Rows"

 

Imke Feldmann (The BIccountant)

If you liked my solution, please give it a thumbs up. And if I did answer your question, please mark this post as a solution. Thanks!

How to integrate M-code into your solution -- How to get your questions answered quickly -- How to provide sample data -- Check out more PBI- learning resources here -- Performance Tipps for M-queries

Wow, I too hoped that the solution would be simpler, but the helper syntax provided is super helpful and explained it all in a very straightforward manner, also allowing me to learn new skills.  Thank you! @ImkeF 

Licantrop0
Microsoft Employee
Microsoft Employee

Thanks so much @ImkeF !

That's a very good workaround.

I hoped there was a more streamlined solution like:

Table.Split([TableName], <condition>)

but I guess I'll have to open a new uservoice item for it... 

Helpful resources

Announcements
Europe Fabric Conference

Europe’s largest Microsoft Fabric Community Conference

Join the community in Stockholm for expert Microsoft Fabric learning including a very exciting keynote from Arun Ulag, Corporate Vice President, Azure Data.

July 2024 Power BI Update

Power BI Monthly Update - July 2024

Check out the July 2024 Power BI update to learn about new features.

July Newsletter

Fabric Community Update - July 2024

Find out what's new and trending in the Fabric Community.