Question

请帮助我找出导致此错误的原因

关键字＆＃39; JOIN＆＃39;
附近的语法不正确

以下是代码：

Label name = (Label)GuitarBrandsGridView.Rows[e.RowIndex].FindControl("lblName");

string queryGuitarItems = "DELETE FROM stringInstrumentItem JOIN brand ON stringInstrumentItem.brandId = brand.brandId WHERE stringInstrumentItem.brandId IN(SELECT brand.brandId FROM brand WHERE name = @brand)";

using (SqlConnection connectionGuitarItems = new SqlConnection(ConfigurationManager.ConnectionStrings["musicStoreConnection"].ToString()))
{
    using (SqlCommand commandGuitarItems = new SqlCommand(queryGuitarItems, connectionGuitarItems))
    {
        connectionGuitarItems.Open();
        commandGuitarItems.Connection = connectionGuitarItems;
        commandGuitarItems.Parameters.Add(new SqlParameter("@brand", name.Text));
        commandGuitarItems.ExecuteNonQuery();

        connectionGuitarItems.Close();
        commandGuitarItems.Parameters.Clear();
    }
}

Answer 1

以下是delete from join语法

的权利

DELETE S  --missing alias name
FROM stringInstrumentItem S 
JOIN brand B 
  ON S.brandId = B.brandId 
WHERE B.name = @brand

注意：您不需要sub-query，因为Brand表已加入

Answer 2

改变这个：

DELETE FROM stringInstrumentItem JOIN brand ON stringInstrumentItem.brandId = brand.brandId WHERE stringInstrumentItem.brandId IN(SELECT brand.brandId FROM brand WHERE name = @brand)

到此：

DELETE FROM stringInstrumentItem
FROM stringInstrumentItem t1 JOIN brand t2 ON t1brandId = t2.brandId WHERE t1.brandId IN(SELECT t3.brandId FROM brand t3 WHERE name = @brand)

希望我帮助你:)。

Answer 3

您必须提供要删除alias的表格。我只是将表格命名为＆＃34; sII ＆＃34;。此外，您不需要WHERE子句。您也可以在连接条件中限制删除。

   DELETE sII
     FROM stringInstrumentItem  sII
INNER JOIN brand b
        ON sII.brandId = b.brandId 
       AND b.name = @brand

关键字＆＃39; JOIN＆＃39;附近的语法不正确。使用asp.net

3 个答案: