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CREATE TABLE employees ( Employee_ID INT, Department_ID INT, Start_Date DATE, End_Date DATE ); INSERT INTO employees (Employee_ID, Department_ID, Start_Date, End_Date) VALUES ('395961', '0001', '2022-01-01', '2022-03-31'), ('395961', '0002', '2022-01-01', '2022-01-31'), ('395961', '0001', '2022-06-01', '2022-10-31'), ('395961', '0001', '2022-11-01', '2022-12-31'), ('395962', '0001', '2022-01-01', '2022-03-31'), ('395962', '0002', '2022-01-01', '2022-01-31'), ('395962', '0002', '2022-02-01', '2022-04-30'), ('395962', '0001', '2022-06-01', '2022-10-31'), ('395962', '0001', '2022-11-01', '2022-12-31'), ('395963', '0001', '2022-01-01', '2022-05-31'), ('395963', '0002', '2022-06-01', '2022-12-31');
11 rows affected
DECLARE @Start_Date DATE, @End_Date DATE; SET @Start_Date = '2022-01-01'; SET @End_Date = '2022-12-31'; WITH cal (date) AS ( SELECT @Start_Date UNION ALL SELECT DATEADD(day, 1, date) FROM cal WHERE date < @End_Date ) SELECT e.Employee_ID, COUNT(cal.date) AS Days_Not_Hired FROM cal CROSS JOIN (SELECT DISTINCT Employee_ID FROM employees) e LEFT JOIN employees e2 ON cal.date BETWEEN e2.Start_Date AND e2.End_Date AND e.Employee_ID = e2.Employee_ID WHERE e2.Employee_ID IS NULL GROUP BY e.Employee_ID OPTION(MAXRECURSION 365);
Employee_ID
Days_Not_Hired
395961
61
395962
31