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):

C#

String connectionString = "Url=https://myorg.sharepoint.com;[email protected];Password=password;File=Book1.xlsx;";

using (Microsoft SharePoint ExcelConnection connection = new Microsoft SharePoint ExcelConnection(connectionString)) {
  Microsoft SharePoint ExcelCommand cmd = new Microsoft SharePoint ExcelCommand("SELECT Id, Name INTO [csv://Account.txt] FROM [Account] WHERE Industry = 'Floppy Disks' ", connection);
  int rowsAffected = cmd.ExecuteNonQuery();
} 

VB.NET

Dim connectionString As [String] = "Url=https://myorg.sharepoint.com;[email protected];Password=password;File=Book1.xlsx;" 

Using connection As New Microsoft SharePoint ExcelConnection(connectionString)
  Dim cmd As New Microsoft SharePoint ExcelCommand("SELECT Id, Name INTO [csv://Account.txt] FROM [Account] WHERE Industry = 'Floppy Disks'", 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 = "Url=https://myorg.sharepoint.com;[email protected];Password=password;File=Book1.xlsx;";

using (Microsoft SharePoint ExcelConnection connection = new Microsoft SharePoint ExcelConnection(connectionString)) {
  Microsoft SharePoint ExcelCommand cmd = new Microsoft SharePoint ExcelCommand("SELECT * INTO [Account] IN [csv://filename=c:/Account.csv;delimiter=tab] FROM [Account] WHERE Industry = 'Floppy Disks'", connection);
  int rowsAffected = cmd.ExecuteNonQuery();
} 

VB.NET

Dim connectionString As [String] = "Url=https://myorg.sharepoint.com;[email protected];Password=password;File=Book1.xlsx;" 

Using connection As New Microsoft SharePoint ExcelConnection(connectionString)
  Dim cmd As New Microsoft SharePoint ExcelCommand("SELECT * INTO [Account] IN [csv://filename=c:/Account.csv;delimiter=tab] FROM [Account] WHERE Industry = 'Floppy Disks'", connection)
  Dim rowsAffected As Integer = cmd.ExecuteNonQuery()
End Using