To 'flag' a specific condition in SQL query - sql

Question

I have a result set in the below format and I need to flag "GroupColumn"
-------------------------------------------------------------------
ID GroupColumn ConditionCol1 ConditionCol2
-------------------------------------------------------------------
1 101 ABC 99
2 101 DEF 99
3 102 ABC 01
4 102 DEF 01
5 103 ABC 02
6 103 DEF 99
7 104 DEF 02
8 104 DEF 99
First of the I need to flag the data based on "GroupColumn", with in this "GroupColumn" I am looking to satisfy Condition of "ABC" from one row and "99" from another row but not necessarily from the same row.
I looking to get a final result set some thing like this for the "Output" column
-------------------------------------------------------------------
ID GroupColumn ConditionCol1 ConditionCol2 Output
-------------------------------------------------------------------
1 101 ABC 99 Satisfied
2 101 DEF 99 Satisfied
3 102 ABC 01
4 102 DEF 01
5 103 ABC 02 Satisfied
6 103 DEF 99 Satisfied
7 104 DEF 02
8 104 DEF 99

Answer 1

You can do this using window functions:
select t.*,
(case when sum(case when conditioncol1 = 'ABC' then 1 else 0 end) over (partition by groupcolumn) > 0 and
sum(case when conditioncol2 = 99 then 1 else 0 end) over (partition by groupcolumn) > 0
then 'Satisfied'
end) as flag
from t;
An alternative is to use group by:
select t.*, tt.flag
from t join
(select groupcolumn, 'Satisfied' as flag
from t
where conditioncol1 = 'ABC' or conditioncol2 = 99
group by groupcolumn
having sum(case when conditioncol1 = 'ABC' then 1 else 0 end) > 0 and
sum(case when conditioncol2 = 99 then 1 else 0 end) > 0
) tt
on tt.groupcolumn = t.groupcolumn;

Answer 2

Assuming you are using SQL Server and you need to add Output column to your original table, you can try the following:
create table #temp
(GroupColumn int,ConditionCol1 varchar(20),ConditionCol2 int)
insert into #temp values (100,'ABC',99)
insert into #temp values (100,'DEF',99)
insert into #temp values (101,'ABC',02)
insert into #temp values (101,'DEF',99)
insert into #temp values (102,'DEF',99)
insert into #temp values (102,'DEF',99)
ALTER TABLE #temp
ADD [Output] varchar(10)
GO
;with cte(GroupColumn) as (
select GroupColumn
from #temp
where ConditionCol1 <> 'ABC'
and ConditionCol2 = 99
)
UPDATE t
SET [Output] = 'Satisfied'
FROM #temp t
INNER JOIN cte on t.GroupColumn = cte.GroupColumn
WHERE t.ConditionCol1 = 'ABC'
UPDATE t
SET [Output] = 'Satisfied'
FROM #temp t
WHERE [Output] is null
and t.GroupColumn in (Select GroupColumn from #temp where [Output]='Satisfied')
select * from #temp