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, Name INTO [csv://[Hive].[Default].Customers.txt] FROM [[Hive].[Default].Customers] WHERE Industry = 'Floppy Disks'

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, Name INTO [csv://[Hive].[Default].Customers.txt;delimiter=tab] FROM [[Hive].[Default].Customers] WHERE Industry = 'Floppy Disks'

C#

String connectionString = "Server=127.0.0.1;Port=8080;";

using (PrestoConnection connection = new PrestoConnection(connectionString)) {
  PrestoCommand cmd = new PrestoCommand("SELECT Id, Name INTO [csv://[Hive].[Default].Customers.txt] FROM [[Hive].[Default].Customers] WHERE Industry = 'Floppy Disks' ", connection);
  int rowsAffected = cmd.ExecuteNonQuery();
} 

VB.NET

Dim connectionString As [String] = "Server=127.0.0.1;Port=8080;" 

Using connection As New PrestoConnection(connectionString)
  Dim cmd As New PrestoCommand("SELECT Id, Name INTO [csv://[Hive].[Default].Customers.txt] FROM [[Hive].[Default].Customers] 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 = "Server=127.0.0.1;Port=8080;";

using (PrestoConnection connection = new PrestoConnection(connectionString)) {
  PrestoCommand cmd = new PrestoCommand("SELECT * INTO [[Hive].[Default].Customers] IN [csv://filename=c:/[Hive].[Default].Customers.csv;delimiter=tab] FROM [[Hive].[Default].Customers] WHERE Industry = 'Floppy Disks'", connection);
  int rowsAffected = cmd.ExecuteNonQuery();
} 

VB.NET

Dim connectionString As [String] = "Server=127.0.0.1;Port=8080;" 

Using connection As New PrestoConnection(connectionString)
  Dim cmd As New PrestoCommand("SELECT * INTO [[Hive].[Default].Customers] IN [csv://filename=c:/[Hive].[Default].Customers.csv;delimiter=tab] FROM [[Hive].[Default].Customers] WHERE Industry = 'Floppy Disks'", connection)
  Dim rowsAffected As Integer = cmd.ExecuteNonQuery()
End Using