Question

i have two tables

t1

id     name
1      saanu
3      abc

delT1

id    name
2     val2
4     val4

I have to find out maximum value of id(int) from the two tables.

Answer 1

select max(maxId) from
(
    select max(id) as maxId from delT1
    union all
    select max(id) as maxId from t1
) maxes;