How can I add fields to a clientdataset at runtime?

Question

I have a TClientDataSet, which is provided by a TTable’s dataset. The dataset has two fields: postalcode (string, 5) and street (string, 20)

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Answer 1

Would like to share more accurate Query for unexisting fields. I bet it's better to use cast, neither spaces!

select E.NAME, E.SURNAME, cast(null as varchar(20)) as CITY
from EMPLOYEE E

e.g. | Marc'O | Polo | |

It's more accurate, can definetly see field size, understandable, easy, safe!