Select first and last record each day - sql

Question

I have a table with an engineerID, DateTimeCreated as DateTime, JobID and AuditTypeID
I need a query shows first (engineerID, JobID with AuditTypeID 1) and last (engineerID, JobID with AuditTypeID 2) on each row of the query.
SELECT TOP (100) PERCENT
dbo.AuditTrail.EngineerId,
dbo.AuditTrail.AuditTypeId,
dbo.Engineers.Name,
dbo.Engineers.EngineerTypeCode,
dbo.AuditTrail.JobId,
CAST(dbo.AuditTrail.DateTimeCreated AS Date) AS _Date
FROM
dbo.AuditTrail
INNER JOIN
dbo.Engineers
ON dbo.AuditTrail.EngineerId = dbo.Engineers.EngineerId
WHERE
(dbo.AuditTrail.AuditTypeId = 1) AND
(dbo.Engineers.EngineerTypeCode = 'p') AND
(dbo.Engineers.EngineerTypeCode = 'p') AND
(DATEPART(mm, dbo.AuditTrail.DateTimeCreated) = 6) AND
(DATEPART(YYYY, dbo.AuditTrail.DateTimeCreated) = 2014)
group by
AuditTrail.engineerID,
JobID,
AuditTypeId,
Engineers.name,
Engineers.EngineerTypeCode,
CAST(dbo.AuditTrail.DateTimeCreated AS Date)
ORDER BY
dbo.AuditTrail.EngineerID DESC
for the first part of my query. Unfortunatly I cannot see to select the first record for each day
Any help will be greatly appreciated

Answer 1

First just get the data you need, including the create date. Then grouping that data by date, select the min of each day. Finally, join the two sets, selecting only the minimum of each day -- that is, the first occurrence of each day.
with
AllMonth( EngineerId, AuditTypeId, Name, EngineerTypeCode, JobId, DateTimeCreated )as(
SELECT TOP (100) PERCENT
a.EngineerId,
a.AuditTypeId,
e.Name,
e.EngineerTypeCode,
a.JobId,
a.DateTimeCreated
FROM dbo.AuditTrail a
JOIN dbo.Engineers e
ON e.EngineerId = a.EngineerId
AND e.EngineerTypeCode = a.EngineerTypeCode
WHERE
a.AuditTypeId = 1
AND a.EngineerTypeCode = 'p'
AND a.DateTimeCreated >= DateAdd( mm, DateDiff( mm, 0, GetDate()), 0)
AND a.DateTimeCreated < DateAdd( mm, DateDiff( mm, 0, GetDate()) + 1, 0)
),
FirstByDay( MinDate )as(
select Min( DateTimeCreated )
from AllMonth
group by cast( DateTimeCreated AS Date )
)
select *
from AllMonth a
join FirstByDay f
on f.MinDate = a.DateTimeCreated
ORDER BY a.EngineerID DESC;
To get the last item of each day, just add a max to FirstByDay and add to the join. Work it into one long row if you really want to.
Btw, didn't I hear a few years back that the later versions of MSSQL ignored top (100) percent? I don't work with it much these days, and my memory is...well, just...somewhere around here...