Ok, jeg fandt ud af det, og det var ret simpelt, dybest set på hver af LEFT JOIN
Jeg var nødt til at filtrere efter startdatoen efter de indgivne parametre.
Jeg skulle også filtrere efter om orloven var godkendt, en Approved_DateTime
og Approved_By
felt udfyldt, hvis det blev godkendt. Også beregningen af varigheden var en smule off under nogle omstændigheder. Så min lagrede procedure ser nu sådan ud:
DELIMITER $$
USE `test`$$
DROP PROCEDURE IF EXISTS `GetLeaveDates`$$
CREATE DEFINER=`root`@`%` PROCEDURE `GetLeaveDates`(pEmpID INT, pDateFrom DATETIME, pDateTo DATETIME, pApproved BOOLEAN)
BEGIN
SELECT
DATE_FORMAT(a.start_date,'%d/%m/%y') AS start,
CASE WHEN a.am_pm = 1 THEN "AM"
WHEN a.am_pm = 2 THEN "PM"
ELSE "" END AS start_am_pm,
DATE_FORMAT(CASE WHEN pDateTo > MIN(c.start_date) THEN
MIN(c.start_date)
ELSE
pDateTo
END, '%d/%m/%y') AS end,
CASE WHEN c.am_pm = 1 THEN "AM"
WHEN c.am_pm = 2 THEN "PM"
ELSE "" END AS end_am_pm,
CASE WHEN a.am_pm = 0 THEN
CASE WHEN c.am_pm = 0 OR c.am_pm = 2 THEN
DATEDIFF(MIN(c.start_date),a.start_date)+1
WHEN c.am_pm = 1 THEN
DATEDIFF(MIN(c.start_date),a.start_date)+0.5
END
WHEN a.am_pm = 1 THEN
CASE WHEN c.am_pm = 0 OR c.am_pm = 2 THEN
DATEDIFF(MIN(c.start_date),a.start_date)+1
WHEN c.am_pm = 1 THEN
DATEDIFF(MIN(c.start_date),a.start_date)+0.5
END
WHEN a.am_pm = 2 THEN
CASE WHEN c.am_pm = 0 OR c.am_pm = 2 THEN
DATEDIFF(MIN(c.start_date),a.start_date)+0.5
WHEN c.am_pm = 1 THEN
DATEDIFF(MIN(c.start_date),a.start_date)
END
END AS Duration
FROM t AS a
LEFT JOIN t AS b ON a.employee_id=b.employee_id AND a.start_date = ADDDATE(b.start_date,1) AND ISNULL(b.approved_datetime) <> pApproved AND b.start_date BETWEEN pDateFrom AND pDateTo
LEFT JOIN t AS c ON a.employee_id=c.employee_id AND a.start_date <= c.start_date AND ISNULL(c.approved_datetime) <> pApproved AND c.start_date BETWEEN pDateFrom AND pDateTo
LEFT JOIN t AS d ON c.employee_id=d.employee_id AND c.start_date = ADDDATE(d.start_date,-1) AND ISNULL(d.approved_datetime) <> pApproved AND d.start_date BETWEEN pDateFrom AND pDateTo
WHERE b.start_date IS NULL AND c.start_date IS NOT NULL AND d.start_date IS NULL
AND a.EMPLOYEE_ID = pEmpID
AND a.START_DATE BETWEEN pDateFrom AND pDateTo
AND ISNULL(a.approved_datetime) <> pApproved
AND a.start_date BETWEEN pDateFrom AND pDateTo
GROUP BY a.employee_id, a.start_date
; END$$
DELIMITER ;