Sql Command error on C# Winforms

Question

Im trying to copy a table structure in winforms app in C# and i always gets the error invalid syntax which is explained below : This is my code

con.Open();
cmd.Connection =con;
cmd.CommandText="Create table temp as select * from Class";
cmd.ExecuteNonQuery();
con.Close();

and the error statement shows Incorrect syntax near 'Select' and Incorrect syntax near class.

Answer 1

应该是，

cmd.CommandText="Create TABLE temp AS (select * from  Class)";

Answer 2

您无法执行此查询，因为＆＃34;选择表格＆＃34;有主键或索引。

试试这个：

    CREATE TABLE temp
    SELECT *
    FROM class
    CREATE INDEX index_column ON temp(index_column);

重要的是要注意，如果表格有主键，则需要运行另一个查询＆＃34;更改表格。＆＃34;并设置表的主键列。

Answer 3

试试这个：

cmd.CommandText="Create TABLE temp select * from  Class";