T-SQL Query to count the occurrences of different conditions in table - sql

Question

DBMS: SQL Server 2008
I have a table with the below structure, which represents tender applications by a particular vendor in different companies and the status of their application. Decision R = Reject, A = Accept.
---------------------------------------------------------------
| ID | Company | ApplicationDate | Decision | DecisionDate |
---------------------------------------------------------------
| 1 | ABC | 15/03/2011 | A | 17/04/2011 |
| 2 | ABC | 23/05/2012 | R | 01/03/2014 |
| 3 | XYZ | 14/07/2012 | R | 20/07/2012 |
| 4 | ABC | 18/01/2013 | A | 24/02/2013 |
| 5 | XYZ | 12/08/2013 | R | 11/09/2013 |
| 6 | ABC | 30/09/2013 | R | 14/10/2013 |
| 7 | ABC | 08/01/2014 | A | 08/06/2014 |
| 8 | ABC | 10/05/2014 | A | 19/05/2014 |
---------------------------------------------------------------
*Dates are in time-stamp format. Dates in the example table (dd/mm/yyyy) are for representation purpose only.
What I need to mine from this simple database is,
Number of tenders applied in the last 12 months - assuming 11/07/2014 as the current date.
Number of tenders rejected in the last 12 months.
Time in months since the last tender application.
Time in months since the last tender rejection.
Number of tenders applied in ABC in the last 12 months.
Number of tenders rejected in ABC in the last 12 months.
Time in months since the last tender application to ABC.
Time in months since the last tender rejection by ABC.
So based on the given table data, the statistics would be,
Four. (IDs 5, 6, 7 and 8 have application date with in 12 months of today)
Three (IDs 2, 5 and 6 have decision date with in 12 months and decision is R)
Two (10/05/2014 till today)
Four (ID 2's rejection was on 01/03/2014)
Three (IDs 6, 7 and 8)
Two (IDs 2 and 6)
Two (10/05/2014 till today)
Four (ID 2's rejection was on 01/03/2014)
Is there a way to get these stats using a single query on the table (possibly by using Sum with case)?
What I have so far is as below.
SELECT
SUM(CASE WHEN DATEDIFF(MM, ApplicationDate, GETDATE()) <= 12 THEN 1 ELSE 0 END) 'Total Tenders',
SUM(CASE WHEN DATEDIFF(MM, DecisionDate, GETDATE()) <= 12 AND DECISION = R THEN 1 ELSE 0 END) 'Total Rejects'
SUM(CASE WHEN DATEDIFF(MM, ApplicationDate, GETDATE()) <= 12 AND Company = 'ABC' THEN 1 ELSE 0 END) 'Total Tenders To ABC',
SUM(CASE WHEN DATEDIFF(MM, DecisionDate, GETDATE()) <= 12 AND DECISION = R AND Company = 'ABC' THEN 1 ELSE 0 END) 'Total Rejects By ABC'
FROM TenderTable;
That gives me 1, 2, 5 and 6 of the required stats.

Answer 1

You can use WITH ROLLUP
SET DATEFORMAT 'dmy'
DECLARE #tbl TABLE (ID INT, Company VARCHAR(3), ApplicationDate DATE, Decision CHAR(1), DecisionDate DATE)
INSERT INTO #tbl
(ID, Company, ApplicationDate, Decision, DecisionDate)
VALUES
(1,'ABC','15/03/2011','A','17/04/2011'),
(2,'ABC','23/05/2012','R','01/03/2014'),
(3,'XYZ','14/07/2012','R','20/07/2012'),
(4,'ABC','18/01/2013','A','24/02/2013'),
(5,'XYZ','12/08/2013','R','11/09/2013'),
(6,'ABC','30/09/2013','R','14/10/2013'),
(7,'ABC','08/01/2014','A','08/06/2014'),
(8,'ABC','10/05/2014','A','19/05/2014')
SELECT
Company = CASE WHEN (GROUPING(Company) = 1) THEN 'ALL' ELSE ISNULL(Company, 'UNKNOWN') END,
TendersApplied = SUM(CASE WHEN ApplicationDate >= DATEADD(M, -12, CAST(GETDATE() AS DATE)) THEN 1 END),
TendersRejected = SUM(CASE WHEN DecisionDate >= DATEADD(M, -12, CAST(GETDATE() AS DATE)) AND Decision = 'R' THEN 1 END),
MonthsSinceLastTenderApplication = DATEDIFF(M, MAX(ApplicationDate), GETDATE()),
MonthsSinceLastTenderRejection = DATEDIFF(M, MAX(CASE WHEN Decision = 'R' THEN DecisionDate END), GETDATE())
FROM #tbl
GROUP BY Company
WITH ROLLUP
HAVING GROUPING(Company) = 1
OR Company = 'ABC'
ORDER BY GROUPING(Company), Company
Which produces
Company TendersApplied TendersRejected MonthsSinceLastTenderApplication MonthsSinceLastTenderRejection
------- -------------- --------------- -------------------------------- ------------------------------
ABC 3 2 2 4
ALL 4 3 2 4
Edit by Questioner:
Modification to the query above satisfies the requirements.
SELECT
TendersApplied = SUM(CASE WHEN ApplicationDate >= DATEADD(M, -12, CAST(GETDATE() AS DATE)) THEN 1 END),
TendersRejected = SUM(CASE WHEN DecisionDate >= DATEADD(M, -12, CAST(GETDATE() AS DATE)) AND Decision = 'R' THEN 1 END),
MonthsSinceLastTenderApplication = DATEDIFF(M, MAX(ApplicationDate), GETDATE()),
MonthsSinceLastTenderRejection = DATEDIFF(M, MAX(CASE WHEN Decision = 'R' THEN DecisionDate END), GETDATE()),
TendersAppliedABC = SUM(CASE WHEN Company = 'ABC' AND ApplicationDate >= DATEADD(M, -12, CAST(GETDATE() AS DATE)) THEN 1 END),
TendersRejectedABC = SUM(CASE WHEN Company = 'ABC' AND DecisionDate >= DATEADD(M, -12, CAST(GETDATE() AS DATE)) AND Decision = 'R' THEN 1 END),
MonthsSinceLastTenderApplicationABC = DATEDIFF(M, MAX(CASE WHEN Company = 'ABC' THEN ApplicationDate END), GETDATE()),
MonthsSinceLastTenderRejectionABC = DATEDIFF(M, MAX(CASE WHEN Company = 'ABC' AND Decision = 'R' THEN DecisionDate END), GETDATE())
FROM #tbl

Answer 2

You may be overlooking an simple way that is not obvious if you've not seen it before.
For example, I have a Table Named StateCounty that has State and County data
select count(*) as TotalCounties
, (select count(*) from StateCounty where StateCode = 'AK') as AlaskaCounties
, (select count(*) from StateCounty where StateCode = 'TX') as TexasCounties
, (select count(*) from StateCounty where County = 'Marion') as CountiesNamedMarion
, (select count(*) from StateCounty where County = 'Washington') as CountiesNamedWashington
from StateCounty
Yields the output
TotalCounties AlaskaCounties TexasCounties CountiesNamedMarion CountiesNamedWashington
------------- -------------- ------------- ------------------- -----------------------
3131 17 254 17 31
(1 row(s) affected)
I believe you can write the query you want yourself now.