Error in PQ - Expression.SyntaxError: Token ')' expected

[username100]

hi everyone , new to PQ in powerBI , i keep on getting this error , Expression.SyntaxError: Token ')' expected

this is my custom column - = Table.TransformColumns(#"Grouped Rows",("First Transaction Month",Date.StartOfMonth,Date.Type)

would appreciate any insights on this, as I am stuck here, I am doing a sample customer cohort & retention analysis 

[v-mdharahman]

Hi @username100,

May I ask if you have resolved this issue? If so, please mark the helpful reply and accept it as the solution. This will be helpful for other community members who have similar problems to solve it faster.

Thank you.

[v-mdharahman]

Hi @username100,

I wanted to check if you had the opportunity to review the information provided. Please feel free to contact us if you have any further questions. If my response has addressed your query, please accept it as a solution and give a 'Kudos' so other members can easily find it.

Thank you.

[v-mdharahman]

Hi @username100,

As we haven’t heard back from you, so just following up to our previous message. I'd like to confirm if you've successfully resolved this issue or if you need further help?

If yes, you are welcome to share your workaround and mark it as a solution so that other users can benefit as well. If you find a reply particularly helpful to you, you can also mark it as a solution.

If you still have any questions or need more support, please feel free to let us know. We are more than happy to continue to help you.
Thank you for your patience and look forward to hearing from you.

[v-mdharahman]

Hi @username100,

Thanks for reaching out to the Microsoft fabric community forum.

It looks like you are facing an issue with syntax when you are creating a new custom column. As @Omid_Motamedise @ZhangKun and @Anonymous provided you with solutions from their side, Please do Mark them as solution if it solves your problem.

If I misunderstand your needs or you still have problems on it, please feel free to let us know.  

Best Regards,
Hammad.
Community Support Team.

If this post helps then please mark it as a solution, so that other members find it more quickly.

Thank you.

[Omid_Motamedise]

Hi, it is all about the second argument, you should provide it in a list. IF you are going to transform values on a column, you just need to use one List sign, but to change the values on more than a column, you have to provided a list including one sub list for each column, so revise your formula to=>


Transform a column = Table.TransformColumns(#"Grouped Rows",{"First Transaction Month",Date.StartOfMonth,Date.Type})


Transform two column= Table.TransformColumns(#"Grouped Rows",{{"First Transaction Month",Date.StartOfMonth,Date.Type},{"Name column 2}, each _+1})

[ZhangKun]

Table.TransformColumns(#"Grouped Rows",{"First Transaction Month", Date.StartOfMonth,Date.Type})

or 

Table.TransformColumns(#"Grouped Rows",{{"First Transaction Month", Date.StartOfMonth,Date.Type}})

For a single conversion, you can use either {} or {{}}

[Anonymous]

Try

able.TransformColumns(#"Grouped Rows",{{"First Transaction Month",Date.StartOfMonth, type date}})

--Nate