You can use the SELECT INTO statement to export formatted data to a file.

Data Export with an SQL Query

The following query exports data into a file formatted in comma-separated values (CSV):

SELECT Id, Column1 INTO [csv://SampleTable_1.txt] FROM [SampleTable_1] WHERE Column2 = 'Bob'

You can specify other formats in the file URI. The possible delimiters are tab, semicolon, and comma with the default being a comma. The following example exports tab-separated values:

SELECT Id, Column1 INTO [csv://SampleTable_1.txt;delimiter=tab] FROM [SampleTable_1] WHERE Column2 = 'Bob'

C#

String connectionString = "URI=C:\folder\table.parquet;";

using (ParquetConnection connection = new ParquetConnection(connectionString)) {
  ParquetCommand cmd = new ParquetCommand("SELECT Id, Column1 INTO [csv://SampleTable_1.txt] FROM [SampleTable_1] WHERE Column2 = 'Bob' ", connection);
  int rowsAffected = cmd.ExecuteNonQuery();
} 

VB.NET

Dim connectionString As [String] = "URI=C:\folder\table.parquet;" 

Using connection As New ParquetConnection(connectionString)
  Dim cmd As New ParquetCommand("SELECT Id, Column1 INTO [csv://SampleTable_1.txt] FROM [SampleTable_1] WHERE Column2 = 'Bob'", connection)
  Dim rowsAffected As Integer = cmd.ExecuteNonQuery()
End Using

You can specify other file formats in the URI. The following example exports tab-separated values:

C#

String connectionString = "URI=C:\folder\table.parquet;";

using (ParquetConnection connection = new ParquetConnection(connectionString)) {
  ParquetCommand cmd = new ParquetCommand("SELECT * INTO [SampleTable_1] IN [csv://filename=c:/SampleTable_1.csv;delimiter=tab] FROM [SampleTable_1] WHERE Column2 = 'Bob'", connection);
  int rowsAffected = cmd.ExecuteNonQuery();
} 

VB.NET

Dim connectionString As [String] = "URI=C:\folder\table.parquet;" 

Using connection As New ParquetConnection(connectionString)
  Dim cmd As New ParquetCommand("SELECT * INTO [SampleTable_1] IN [csv://filename=c:/SampleTable_1.csv;delimiter=tab] FROM [SampleTable_1] WHERE Column2 = 'Bob'", connection)
  Dim rowsAffected As Integer = cmd.ExecuteNonQuery()
End Using