t1, t2, t3
10, 15, 7
12, 6, 8
5, 4, 11
1st record: maximum=15
2nd record: maximum=12
3rd record: maximum=11
I need the maximum of these 3 records (maximum of 15, 12 & 11) = 15.
I guess what I need is the maximum of t1, t2 or t3 of all the records.

SELECT IIF(t1>t2,IIF(t1>t3,t1,t3),IIF(t2>t3,t2,t3)) as xRet from table1
This only gives the maximum of t1, t2 or t3 per record.
How do I get the maximum of that maximum?

Thank you all!