Forum Discussion
Error wile bulk changing column names in Power Query
I'm trying to bulk change column names with power query and i'm stuck with an error i can't understand :
For that i've followed a very interesting post of Soheil Bakhshi : https://www.biinsight.com/a-power-query-custom-function-to-rename-all-columns-at-once-in-a-table/#more-8997
for the function :
//fnRenameColumnsFromRefQuery
(ColumnName as text) as text =>
let
Source =
if (
List.Contains(
Record.FieldNames(#sections[Section1]),
"Column Names Mapping"
)
) = true
then #"Column Names Mapping"
else null,
ColumnNewName =
try
if List.Contains(Source[Column Name], ColumnName) = true
then
if Text.Trim(Table.SelectRows(Source, each ([Column Name] = ColumnName)){0}[Description]) = ""
then ColumnName
else Table.SelectRows(Source, each ([Column Name] = ColumnName)){0}[Description]
else Source
otherwise ColumnName
in
ColumnNewName
Then the code used for changing in my data source table :
let
Source = Sql.Database("XXX.XXX.XXX.XXX", "XXXXXXX"),
dbo_HCR120P = Source{[Schema="dbo",Item="HCR120P"]}[Data],
#"Type modifié" = Table.TransformColumnTypes(dbo_HCR120P,{{"PACSOC", type text}, {"PACPAY", type text}, {"PALPAY", type text}, {"PAFCEE", type text}, {"PACINS", type text}, {"PACLGU", type text}, {"PACSEC", type text}, {"PANCTT", type text}, {"PAADAC", type text}, {"PAMDAC", type text}, {"PAJDAC", type text}}),
#"Rename Column" = Table.TransformColumnNames(#"Type modifié", fnRenameColumnsFromRefQuery)
in
#"Rename Column"
Could you guys help me and tell me what's wrong ?
Kind regards,
Mohammad
Hello Anonymous
the problem is in your else clause. Use this code instead
//fnRenameColumnsFromRefQuery (ColumnName as text) as text => let Source = if ( List.Contains( Record.FieldNames(#sections[Section1]), "Column Names Mapping" ) ) = true then #"Column Names Mapping" else null, ColumnNewName = try if List.Contains(Source[Column Name], ColumnName) = true then if Text.Trim(Table.SelectRows(Source, each ([Column Name] = ColumnName)){0}[Description]) = "" then ColumnName else Table.SelectRows(Source, each ([Column Name] = ColumnName)){0}[Description] else ColumnName otherwise ColumnName in ColumnNewName
If this post helps or solves your problem, please mark it as solution (to help other users find useful content and to acknowledge the work of users that helped you)
Kudoes are nice too
Have fun
Jimmy
1 Reply
Hello Anonymous
the problem is in your else clause. Use this code instead
//fnRenameColumnsFromRefQuery (ColumnName as text) as text => let Source = if ( List.Contains( Record.FieldNames(#sections[Section1]), "Column Names Mapping" ) ) = true then #"Column Names Mapping" else null, ColumnNewName = try if List.Contains(Source[Column Name], ColumnName) = true then if Text.Trim(Table.SelectRows(Source, each ([Column Name] = ColumnName)){0}[Description]) = "" then ColumnName else Table.SelectRows(Source, each ([Column Name] = ColumnName)){0}[Description] else ColumnName otherwise ColumnName in ColumnNewName
If this post helps or solves your problem, please mark it as solution (to help other users find useful content and to acknowledge the work of users that helped you)
Kudoes are nice too
Have fun
Jimmy