Union ALL fetches empty rows - sql

Question

I have two query joined with a union All.
SELECT select 'Finished' AS Status,amount AS amount,units As Date
from table1 WHERE Pdate > cdate AND name =#name
UNION ALL
SELECT select 'Live' AS Live,amount,units
from table1 Where Pdate = cdate And name =#name
Result
Status amount units
Finished 100 20
Live 200 10
When either of the query fetches empty set I get only one row and, if both fetches empty set then I no rows
So how can I get result like this
Status amount Units
Finished 100 20
Live 0 0
OR
Status amount Units
Finished 0 0
Live 200 10
OR
Status amount Units
Finished 0 0
Live 0 0
Thanks.

Answer 1

I would think you can do it using sum? And if sum doesn't return 0 when there are no rows then replace with Coalesce(sum(amount), 0) as amount
SELECT select 'Finished' AS Status,sum(amount) AS amount, sum(units) As Unit
from table1 WHERE Pdate > cdate AND name =#name
UNION ALL
SELECT select 'Live' AS Status, sum(amount) as amount, sum(units) as Unit
from table1 Where Pdate = cdate And name =#name
And if you are not trying to sum the results then just coalesce should work? coalesce(amount, 0) As amount etc...

Answer 2

I just want to point out that your query is needlessly complex, with nested selects and a union all. A better way to write the query is:
select (case when pdate > cdate then 'Finished' else 'Live' end) AS Status,
amount AS amount, units As Date
from table1
WHERE Pdate >= cdate AND name = #name
This query does not produce what you want, since it only produces rows where there is data.
One way to get the additional rows is to augment the original data and then check if it is needed.
select status, amount, units as Date
from (select Status, amount, units,
row_number() over (partition by status order by amount desc, units desc) as seqnum
from (select (case when pdate > cdate then 'Finished' else 'Live' end) AS Status,
amount, units, name
from table1
WHERE Pdate >= cdate AND name = #name
) union all
(select 'Finished', 0, 0, #name
) union all
(select 'Live', 0, 0, #name
)
) t
where (amount > 0 or units > 0) or
(seqnum = 1)
This adds in the extra rows that you want. It then enumerates them, so they would go last in any sequence. They are ignored, unless they are the first in the sequence.

Answer 3

Try something like this
with stscte as
(
select 'Finished' as status
union all
select 'Live'
),
datacte
as(
select 'Finished' AS Status,amount AS amount,units As Date
from table1 WHERE Pdate > cdate AND name =#name
UNION ALL
select 'Live' ,amount,units
from table1 Where Pdate = cdate And name =#name
)
select sc.status,isnull(dc.amount,0) as amount,isnull(dc.unit,0) as unit
from stscte sc left join datacte dc
on sc.status = dc.status