Finding consecutive 7 days absent employee from attendance table neglecting week off and holiday in sql server R2

Question

here is my attendance table details

Emp_id  Emp_name      PDate       status
000002  Pramod      2014-01-11      A
000002  Pramod      2014-01-12      WO
000002  Pramod      2014-01-13      A
000002  Pramod      2014-01-14      A
000002  Pramod      2014-01-15      H
000002  Pramod      2014-01-16      A
000002  Pramod      2014-01-17      A
000002  Pramod      2014-01-18      A
000002  Pramod      2014-01-19      WO
000002  Pramod      2014-01-20      A
000002  Pramod      2014-01-21      A

A : Absent

WO:Week off

H :Holiday

i have other employee data who is having status P(present) also but i need to fetch those who are continuously absent for 7 days without considering weekoff and holiday ......

Answer 1

Will this do?

CREATE TABLE Attendance(
    Emp_id      VARCHAR(10),
    Emp_name    VARCHAR(10),
    PDate       DATE,
    Status      VARCHAR(2)
)
INSERT INTO Attendance VALUES
('000002', 'Pramod', '2014-01-11', 'A'),
('000002', 'Pramod', '2014-01-12', 'WO'),
('000002', 'Pramod', '2014-01-13', 'A'),
('000002', 'Pramod', '2014-01-14', 'A'),
('000002', 'Pramod', '2014-01-15', 'H'),
('000002', 'Pramod', '2014-01-16', 'A'),
('000002', 'Pramod', '2014-01-17', 'A'),
('000002', 'Pramod', '2014-01-18', 'A'),
('000002', 'Pramod', '2014-01-19', 'A'),
('000002', 'Pramod', '2014-01-20', 'P'),
('000002', 'Pramod', '2014-01-21', 'A');

;WITH GroupedDates AS(
    SELECT
        *,
        DateGroup = DATEADD(DD, - ROW_NUMBER() OVER (PARTITION BY Emp_id ORDER BY PDate), PDate)
    FROM Attendance
    WHERE
        Status IN('A', 'WO', 'H')
)
SELECT 
    Emp_id,
    Emp_name,
    StartDate   =   MIN(PDate),
    EndDate     =   MAX(PDate),
    Days        =   DATEDIFF(DD, MIN(PDate), MAX(PDate)) + 1 
                    - SUM((CASE WHEN Status IN('WO', 'H') THEN 1 ELSE 0 END))
FROM GroupedDates
GROUP BY 
    Emp_id, Emp_name, DateGroup
HAVING 
    SUM(CASE WHEN Status = 'A' THEN 1 ELSE 0 END) >=7
ORDER BY 
    Emp_id, Emp_name, StartDate

DROP TABLE Attendance