Question

I want to get all records from a table1 & insert them into table2. Table1 & table2 are in different databases, table1 and table2 are same structure.

Normally, I will get all records from table1, and for each record (foreach), I will insert it into table2 by using “INSERT …”. I want to know a effect way to insert all records into table only one time without foreach.

I use C#, .NET 2.0 & WinForm.

Thanks.

Answer 1

In SQL Code you can do a SELECT in the INSERT

INSERT INTO Table2 
(Id, Name, IsActive) 
SELECT Id, Name, IsActive 
FROM Table2

Or if you are doing in Code then check out the SqlBulkCopy class

            sqlConn.Open();
            using (var bulkCopy = new SqlBulkCopy(sqlConn))
            {
                bulkCopy.DestinationTableName = "Table2";
                bulkCopy.WriteToServer(dataTable);
            }
            sqlConn.Close();