Ms Access Query: Concatenating Rows through a query

You need a function to do the concatenation.

Microsoft Access condense multiple lines in a table

Example using your data:

Select T.ColumnA
  , GetList("Select ColumnB From Table1 As T1 Where T1.ColumnA = " & [T].[ColumnA],"",", ") AS ColumnBItems
From Table1 AS T
Group By T.ColumnA;

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