Buraa, Welcome to the Lazarus forum!
If I understand you correctly, you want to know the SQL for the query.
I think that would be:
select PremixName, PremixQuantity from Premix_table, Feedprimix_table where Premix_table.premixID=Feedprimix_table.premixID
Note that I removed some spaces from your Field / Table names.
cheers
S.