Regarding my comment on your question, imagine this:
Table Name | Content
--------------------
Table A | 1, 2
Table B | A, B
Result of cross join is:
A | B
-----
1 | A
1 | B
2 | A
2 | B
You should use table aliases. See:
SELECT C.[Client Name], C.Surname, C.Address, C.[Tel Nr]
FROM Clients AS C;
When you explain the relationship between
Clients
and
Reports
table, i'll improve my answer.