The execute_sql function takes the db_conn as userdata so it can be used by the implementation. You can think of this like a closure. The function signature has a pointer (i64) input and a pointer ...

By Design: Output bindings against tables with columns of data types NTEXT, TEXT, or IMAGE are not supported and data upserts will fail. These types will be removed in a future version of SQL Server ...

SQL tutorial: Learn SQL on ... functions, operators, aggregate functions, index ... If I were doing this exercise on Windows, I might well use the visual SQL query builder and SQL command ...