DELETE ステートメント
テーブルから情報を削除するには、DELETE ステートメントを使用します。
DELETE 構文
DELETE ステートメントには、次の例に示すように、FROM 句のテーブル名とWHERE 句の行の主キーが必要です。
<delete_statement> ::= DELETE FROM <table_name> WHERE { Id = <expression> } [ { AND | OR } ... ]
<expression> ::=
| @ <parameter>
| ?
| <literal>
次の例に示すように、ExecuteNonQuery メソッドを使って、データ操作コマンドを実行し影響を受ける行数を取得できます。
C#
String connectionString = "url=https://myaccount.region.snowflakecomputing.com;user=Admin;password=test123;Database=Northwind;Warehouse=TestWarehouse;Account=Tester1;"; using (SnowflakeConnection connection = new SnowflakeConnection(connectionString)) { int rowsAffected; SnowflakeCommand cmd = new SnowflakeCommand("DELETE FROM [DemoDB].[PUBLIC].Products WHERE Id = @myId", connection); cmd.Parameters.Add(new SnowflakeParameter("myId","22")); rowsAffected = cmd.ExecuteNonQuery(); }
VB.NET
Dim connectionString As [String] = "url=https://myaccount.region.snowflakecomputing.com;user=Admin;password=test123;Database=Northwind;Warehouse=TestWarehouse;Account=Tester1;" Using connection As New SnowflakeConnection(connectionString) Dim rowsAffected As Integer Dim cmd As New SnowflakeCommand("DELETE FROM [DemoDB].[PUBLIC].Products WHERE Id = @myId", connection) cmd.Parameters.Add(New SnowflakeParameter("myId", "22")) rowsAffected = cmd.ExecuteNonQuery() End Using