SQL Server: Compare two columns in two tables - sql-server

Question

I have two tables (from two different systems) that track the employees' hours. In both tables, the employees enter the date and hours. I need to create an audit report that shows the discrepancy. The report needs to show all the columns and display a null/no match if there is a mismatch. One table might have more/less entries than the other table or even duplicate entries and I need to catch that (two entries on the same day for the same amount of hours in one table). Both tables have UserID that can be joined on.
If there is match based on date and hours, show all the values.
If there is a mismatch based on hours, show null or no match when there is mismatch.
If there is a duplicate entry, like the image below, match the first entry and report the second one as null or no match.
I tried joining the tables based UserID, date, and hours but not able to tell where the mismatch came from.
Table A:
Table B:
Left Join on UserID, date, and hours

Answer 1

SET NOCOUNT ON;
declare #table1 table
(
userid int,
entry_date date,
[hours] varchar(10)
)
declare #table2 table
(
userid int,
entry_date datetime,
[hours] varchar(10)
)
INSERT INTO #table1
select 1,'8/14/2017','10:00'
INSERT INTO #table1
select 2,'8/14/2017','5:00'
INSERT INTO #table1
select 2,'8/14/2017','5:00'
INSERT INTO #table1
select 2,'8/14/2017','5:00'
INSERT INTO #table1
select 2,'8/14/2017','5:00'
INSERT INTO #table1
select 3,'8/14/2017','5:00'
INSERT INTO #table1
select 3,'8/14/2017','6:00'
INSERT INTO #table1
select 3,'8/14/2017','6:00'
INSERT INTO #table1
select 3,'8/14/2017','6:00'
INSERT INTO #table2
select 1,'8/14/2017','10:00'
INSERT INTO #table2
select 2,'8/14/2017','8:00'
INSERT INTO #table2
select 3,'8/14/2017','6:00'
INSERT INTO #table2
select 4,'8/14/2017','2:00'
INSERT INTO #table2
select 1,'8/14/2017','10:00'
INSERT INTO #table2
select 3,'8/14/2017','6:00'
;WITH CTE_TABLE1 AS
(
select t.userid as userid, CAST(t.entry_date as DATE) as entry_date, t.[hours] as [hours],
ROW_NUMBER() OVER(PARTITION BY t.userid, t.entry_date, t.[hours] ORDER BY t.[Hours]) as rnk
from #Table1 t
), CTE_TABLE2 AS
(
select t.userid as userid, CAST(t.entry_date as DATE) as entry_date, t.[hours] as [hours],
ROW_NUMBER() OVER(PARTITION BY t.userid, t.entry_date, t.[hours] ORDER BY t.[Hours]) as rnk
from #Table2 t
), CTE_MATCHES AS
(
select t1.userid as userid, t1.entry_date as entry_date, t1.[hours] as [hours], t1.rnk
from CTE_TABLE1 t1
inner join CTE_TABLE2 t2
on (t1.userid = t2.userid AND t1.entry_date = t2.entry_date AND t1.[hours] = t2.[hours] AND t1.rnk = t2.rnk)
),CTE_MATCH_DUPLICATES AS
(
select 'Table1MatchDuplicate' as ErrorType, *
from
(
select t.*
from (select userid, entry_date, [hours], max(rnk) as rnk from CTE_MATCHES group by userid, entry_date, [hours]) m
inner join CTE_TABLE1 t
on (t.userid = m.userid AND t.entry_date = m.entry_date AND t.[hours] = m.[hours] AND t.rnk > m.rnk)
)q
UNION ALL
select 'Table2MatchDuplicate' as ErrorType, *
from
(
select t.*
from (select userid, entry_date, [hours], max(rnk) as rnk from CTE_MATCHES group by userid, entry_date, [hours]) m
inner join CTE_TABLE2 t
on (t.userid = m.userid AND t.entry_date = m.entry_date AND t.[hours] = m.[hours] AND t.rnk > m.rnk)
)q
)
, CTE_Table1_UNMATCHED AS
(
select t.userid, t.entry_date, t.[hours]
from #Table1 t
left outer join CTE_MATCHES m
on (t.userid = m.userid AND CAST(t.entry_date as DATE) = m.entry_date AND t.[hours] = m.[hours])
where m.userid is null
), CTE_Table2_UNMATCHED AS
(
select t.userid, t.entry_date, t.[hours]
from #Table2 t
left outer join CTE_MATCHES m
on (t.userid = m.userid AND CAST(t.entry_date as DATE) = m.entry_date AND t.[hours] = m.[hours])
where m.userid is null
)
select null as ErrorType, userid, entry_date, [hours] from CTE_MATCHES
UNION ALL
select 'Table1Mismatch' as ErrorType, userid, entry_date, [hours] from CTE_Table1_UNMATCHED
UNION ALL
select 'Table2Mismatch' as ErrorType, userid, entry_date, [hours] from CTE_Table2_UNMATCHED
UNION ALL
select ErrorType, userid, entry_date, [hours] from CTE_MATCH_DUPLICATES
order by ErrorType
http://rextester.com/UDG95824
if you need to find duplicates that had no matches as well:
,CTE_Table1_Unmatched_Duplicates AS
(
select userid, entry_date, [hours]
from CTE_Table1_UNMATCHED
group by userid, entry_date, [hours]
having count(*) > 1
),CTE_Table2_Unmatched_Duplicates AS
(
select userid, entry_date, [hours]
from CTE_Table2_UNMATCHED
group by userid, entry_date, [hours]
having count(*) > 1
)
...
UNION
select 'Table1UnmatchedDuplicates' as ErrorType, userid, entry_date, [hours] from CTE_Table1_Unmatched_Duplicates
UNION
select 'Table2UnmatchedDuplicates' as ErrorType, userid, entry_date, [hours] from CTE_Table2_Unmatched_Duplicates
http://rextester.com/KEJJF79330