sql server 2014 group by date extract several fields - sql-server

Question

I have a table that looks like this:
CREATE TABLE dbo.Mails (
ID int IDENTITY(1, 1) NOT NULL,
Reference nvarchar(20) COLLATE Latin1_General_CI_AS NULL,
Email nvarchar(70) NOT NULL,
ETS datetime NULL, --Estimated Time of Shipping
ATS datetime NULL, --Actual Time of Shipping
ReadOn datetime NULL,
Unsubscribed datetime NULL,
Bounced datetime NULL,
BouncedReason nvarchar(30) COLLATE Latin1_General_CI_AS NULL,
Active bit DEFAULT 1 NULL
)
I need to show info on a chart, and I need to group by Date.
therefore if I want to group details by ReadOn field for a certain campaign I build the following query
Select
CAST(readOn as date) [date],
COUNT(*) [read]
FROM Mails m
WHERE m.Reference=#Reference
GROUP BY CAST(readOn as date)
ORDER BY CAST(readOn as date) ASC
and I get something like this:
sDate read
NULL 360
2016-05-05 67
2016-05-06 123
2016-05-07 84
2016-05-08 62
2016-05-09 89
2016-05-10 17
2016-05-11 12
2016-05-12 8
2016-05-13 4
2016-05-14 4
But I would like to extract, in the same query, not only ReadOn field, but also other fields like ETS, ATS, Unsubscribed/Read & Unread and Bounced
and get something like this
sDate read ETS ATS Bounced Unsub./Read Unsub/Unread
NULL 360
2016-05-05 67 830 570 27 7 3
2016-05-06 123 0 260 4 9 5
2016-05-07 84 0 0 0 2 2
2016-05-08 62 0 0 0 2 4
2016-05-09 89 0 0 0 7 1
2016-05-10 17 0 0 0 5 6
2016-05-11 12 0 0 0 8 2
2016-05-12 8 0 0 0 1 3
2016-05-13 4 0 0 0 0 2
2016-05-14 4 0 0 0 0 2
Is there an easier way than building 6 different queries?
can at least indicate the path to follow?
Thanks
Joe

Answer 1

You can do it with some pre-processing and a PIVOT. In this example, I've put the query into a stored procedure, so that it is contained and easy to test. I'm doing the pre-processing in a CTE, to keep the main query tidy.
First, create the table and populate it.
CREATE TABLE dbo.Mails
(
ID int IDENTITY(1, 1) NOT NULL,
Reference nvarchar(20) COLLATE Latin1_General_CI_AS NULL,
ETS datetime NULL, --Estimated Time of Shipping
ATS datetime NULL, --Actual Time of Shipping
ReadOn datetime NULL,
Unsubscribed datetime NULL,
Bounced bit DEFAULT 0 NULL,
BouncedReason nvarchar(30) COLLATE Latin1_General_CI_AS NULL,
Active bit DEFAULT 1 NULL
);
GO
INSERT INTO dbo.Mails (Reference, ETS, ATS, ReadOn, Unsubscribed, Bounced)
VALUES
(N'ABC', '2015-05-05', '2015-05-05', '2015-05-05', NULL, 0),
(N'ABC', '2015-05-06', '2015-05-07', '2015-05-08', NULL, 0),
(N'ABC', '2015-05-05', '2015-05-05', '2015-05-07', NULL, 0),
(N'ABC', '2015-05-07', '2015-05-08', '2015-05-09', NULL, 0),
(N'ABC', '2015-05-06', '2015-05-07', '2015-05-09', '2015-05-09', 0),
(N'ABC', '2015-05-06', '2015-05-07', NULL, '2015-05-08', 0);
Then create a stored procedure with a parameter #Reference. I'm using a CTE to create a two column row set, with Date and Type as the columns. Then, in the main SELECT statement it's being pivoted to give the result you want.
The row set produced by the CTE looks like this.
Note: I haven't included the Bounced column, because I'm not clear what the requirement is for that; it's not a date column. However you should be able to extend this example quite easily.
CREATE PROCEDURE dbo.up_ReportMails
(
#Reference nvarchar(20)
)
AS
WITH cte AS
(
SELECT CAST(ReadOn AS date) AS 'Date', 'R' AS 'Type'
FROM dbo.Mails
WHERE Reference = #Reference AND ReadOn IS NOT NULL
UNION ALL
SELECT CAST(ETS AS date), 'E'
FROM dbo.Mails
WHERE Reference = #Reference AND ETS IS NOT NULL
UNION ALL
SELECT CAST(ATS AS date), 'A'
FROM dbo.Mails
WHERE Reference = #Reference AND ATS IS NOT NULL
UNION ALL
SELECT CAST(Unsubscribed AS date), 'U'
FROM dbo.Mails
WHERE Reference = #Reference AND UNSUBSCRIBED IS NOT NULL AND ReadOn IS NOT NULL
UNION ALL
SELECT CAST(Unsubscribed AS date), 'V'
FROM dbo.Mails
WHERE Reference = #Reference AND UNSUBSCRIBED IS NOT NULL AND ReadOn IS NULL
)
SELECT [Date], [R] AS 'Read', [E] AS 'ETS', [A] AS 'ATS', [U] AS 'Unsub/Read', [V] As 'Unsub/Unread'
FROM
(SELECT [Date], [Type]
FROM cte) AS C
PIVOT
(
COUNT([Type])
FOR [Type] IN ([R], [E], [A], [U], [V])
) AS PivotTable
ORDER BY [Date];
Then we can test it.
EXEC dbo.up_ReportMails #Reference=N'ABC';

Answer 2

I've tested this code and it works. Assuming you have a calendar table (if you don't have one, you can Google it and make one in about 10 minutes - they're very simple and will save you loads of time):
DECLARE #StartDate date = '01/01/2016'
DECLARE #EndDate date = '05/06/2016'
SELECT C.BaseDate,
ISNULL(SUM(CASE WHEN C.BaseDate = CAST(M.ETS AS DATE) THEN 1 END), 0) AS [ETS],
ISNULL(SUM(CASE WHEN C.BaseDate = CAST(M.ATS AS DATE) THEN 1 END), 0) AS [ATS],
ISNULL(SUM(CASE WHEN C.BaseDate = CAST(M.ReadOn AS DATE) THEN 1 END), 0) AS [Read On],
ISNULL(SUM(CASE WHEN C.BaseDate = CAST(M.Unsubscribed AS DATE) THEN 1 END), 0) AS [Unsubscribed],
ISNULL(SUM(CASE WHEN C.BaseDate = CAST(M.Bounced AS DATE) THEN 1 END), 0) AS [Bounced]
FROM Calendar C
LEFT OUTER JOIN Mails M
ON C.BaseDate = CAST(M.ETS AS DATE)
OR C.BaseDate = CAST(M.ATS AS DATE)
OR C.BaseDate = CAST(M.ReadOn AS DATE)
OR C.BaseDate = CAST(M.Unsubscribed AS DATE)
OR C.BaseDate = CAST(M.Bounced AS DATE)
WHERE C.BaseDate BETWEEN #StartDate AND #EndDate
GROUP BY C.BaseDate
Basically what you're doing is selecting every date from the calendar table within your date range, and then joining it to your mails table if ANY of the datetimes match that date. The purpose of the left join is so that dates on which nothing occurs are still returned in your result set. They will all be zeros, but it's better for consistency and in case someone wants to calculate averages from your report.
Once you have all the dates - and all of the records that have a matching datetime, you just need to count how many, for each date, have a matching ETS, how many have a matching ATS, so on and so forth. Last, you group by the calendar date and you're all done.