>>I alredy know the command ALTER TABLE .... to modify a table. I'm able to add fields, but they are always added as the last field. I would like to know how to insert a field at the position I want or to only change the position of an existing field. Of course, I want to do this by programmation...

>About 3 months ago I had the similar problem and thread. I think, there is no way to change order of the fields rather than manually re-arrange them.

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This is just an idea, but should work:
- Use AFIELDS()
- AINS() rows corrsponding to new fields.
- create a new table
- APPEND FROM exisitng table (fields with matching names should be mapped correctly)
- delete the current table
- and finally rename the new table.