-- Bei Suchthilfe Ostfriesland 2235342307 (APP2)
-- Abwesenheiten pro Monat mit Uhrzeit

SELECT qry.Nachname, qry.Vorname, qry.Kategorie, DATE(qry.von) AS Start, date_format(qry.von, "%H:%i") AS `Start Uhrzeit`, 
DATE(qry.bis) AS Ende,  date_format(qry.bis, "%H:%i") AS `Ende Uhrzeit`
-- ,qry.DauerJahr AS TageProMonat
FROM
(select p.`FirstName` as Vorname, p.`LastName` as Nachname, ar.`Description` as Kategorie, 
CASE WHEN at.`Start`>= ':Monat_Start' THEN at.`Start` ELSE ':Monat_Start' END as von, 
CASE WHEN at.`EndTime`<= ':Monat_End' THEN at.`EndTime` ELSE ':Monat_End' END as bis, 
CASE WHEN at.`Start`>= ':Monat_Start' THEN datediff(CASE WHEN ifnull(at.`EndTime`, CURDate()) <= ':Monat_End' THEN at.`EndTime` ELSE ':Monat_End' END, at.`Start`)-1 
ELSE datediff(ifnull(at.`EndTime`, CURDate()), ':Monat_Start') END AS DauerJahr, 
datediff(ifnull(at.`EndTime`, CURDate()), at.`Start`)-1 AS Dauer, 
c.Oid AS cOid
from `person` p 
inner join `customer` c on p.`Oid` = c.`PersonOid` 
inner join `absencetime` at on c.`Oid` = at.`CustomerOid` 
inner join `absencereason` ar on at.`AbsenceReasonOid` = ar.`Oid` 
where c.`IsActive` = 1 and  at.EndTime >= ':Monat_Start'  and at.Start <= ':Monat_End')qry 
order by qry.Nachname, qry.von;