Counting the records of two columns from different tables - sql-server

Question

So I have this:
select count(InvoiceUniqueness) as [Nbr], CONVERT(varchar(12), ProcessDate, 101) as [Date]
from PreProcessTransLog
where (CONVERT(DATETIME, ProcessDate, 102)) >= dateadd (m,-24,getdate()) and CONVERT(DATETIME, ProcessDate, 120) <= GETDATE()
and InitialStatus =2
group by CONVERT(varchar(12), ProcessDate, 101)
order by CAST (CONVERT(varchar(12), ProcessDate, 101) as smalldatetime) desc
I want to count the records under the InvoiceUniqueness column from the PreProcessTransLog table and count the records under (column not in the code) ManualBillHeaderID from another table called Ex_Manual_Bill_Header. I want to display both count results in a new column called Nbr. So in simpler terms, lets say I count column1 from T1 and column2 from T2. column1 has 10 records and column2 has 5. I want to join both columns into one so I can display 15 records. Keep in mind the columns have different names. hope im explaining myself

Answer 1

Try something like this:
SELECT
COALESCE(t1.[Date], t2.[Date]) AS [Date],
ISNULL(t1.Nbr, 0), + ISNULL(t2.Nbr, 0) AS Total
FROM
(
SELECT COUNT(InvoiceUniqueness) AS [Nbr], CONVERT(VARCHAR(12), ProcessDate, 101) AS [Date]
FROM PreProcessTransLog
WHERE (CONVERT(DATETIME, ProcessDate, 102))>=DATEADD(m, -24, GETDATE()) AND CONVERT(DATETIME, ProcessDate, 120)<=GETDATE() AND InitialStatus=2
GROUP BY CONVERT(VARCHAR(12), ProcessDate, 101)
--ORDER BY [Date]
) t1,
FULL JOIN (
SELECT COUNT(ManualBillHeaderID ) AS [Nbr], CONVERT(VARCHAR(12), ProcessDate, 101) AS [Date]
FROM <whatever table>
WHERE (CONVERT(DATETIME, ProcessDate, 102))>=DATEADD(m, -24, GETDATE()) AND CONVERT(DATETIME, ProcessDate, 120)<=GETDATE() AND InitialStatus=2
GROUP BY CONVERT(VARCHAR(12), ProcessDate, 101)
--ORDER BY [Date]
) t2 ON t1.[Date] = t2.[Date]
ORDER BY
COALESCE(t1.[Date], t2.[Date])

Answer 2

If I'm understanding your request accurately, I would do something like this.
Do your counts, off each table, and merge the results with a UNION ALL, wrap that up in a sub-query, and SUM() the resulting counts.
declare #table1 table (id int identity(1,1), recorddate datetime)
declare #table2 table (id int identity(1,1), otherdate datetime)
insert into #table1
select '2014-08-01' union all
select '2014-08-01'
insert into #table2
select '2014-08-01' union all
select '2014-08-02'
select SUM(num), recorddate
from (select COUNT(1) num, recorddate
from #table1
group by recorddate
union all
select COUNT(1) num, otherdate
from #table2
group by otherdate ) x
group by recorddate
In the case you want the results separate, change the last query to this:
select COUNT(*) num, recorddate
from #table1
group by recorddate
union all
select COUNT(*) num, otherdate
from #table2
group by otherdate

Answer 3

Try using a UNION ALL. For example:
SELECT COUNT(Column1) AS [Nbr]
FROM Table1
GROUP BY ColumnToGroupOn1
UNION ALL
SELECT COUNT(Column2)
FROM Table2
GROUP BY ColumnToGroupOn2
Or if you want to include the date column/s:
SELECT COUNT(Column1) AS [Nbr], ColumnToGroupOn1 AS [Date]
FROM Table1
GROUP BY ColumnToGroupOn1
UNION ALL
SELECT COUNT(Column2), ColumnToGroupOn2
FROM Table2
GROUP BY ColumnToGroupOn2