Question

TableA

int  class del
null  13
null  13
null  13
12    13
null  23
null  23
null  87
null  74
null  74
null  65
32    65

So, I want to populate del = ‘A’ where for a given class, its all int is null else it should populate B.

Expected result:

TableA

int  class del
null  13    B
null  13    B
null  13    B
12    13    B
null  23    A
null  23    A
null  87    A
null  74    A
null  74    A
null  65    B
32    65    B

Answer 1

update
    TableA
set
    del = Case
            when mcolint is null Then 'A'
            Else 'B'
    End
from
    TableA T
inner join
    (
        select
            class,
            MAX(colint) mcolint
        from
            TableA
        group by
            class
    ) T1
on
    T.class = T1.class