Thanks for your help. 😀
In the SQLyog FAQ there is this hint:
‘When using Floating Point datatypes there should always be a PK based on non-floating column(s) and the PK-column(s) should be included in every SELECT generating a result set used for updating the table.’
Taking the index-field into my SELECT, the incremental transfer works fine.
Your SQLyog: an excellent tool !
Best regards
K.Heine