A common practice to pass a 4D variable to an external sql server is to use the command SQL EXECUTE. Passing 4D variables to an external SQL server from a Begin SQL/End SQL may not always work depending on which server you are working with. A good way to do this is to first concatenate the variables into a text variable, and then pass the text variable into SQL EXECUTE.

Here is an example of inserting 4D variables ($var1, $var2) into a table (Table_1) on the external sql database.