Find out the next business days using Outer Apply Clause

Rajnilari2015
Posted by Rajnilari2015 under Sql Server category on | Points: 40 | Views : 223
Suppose we have something as under -

DATE	LEAVEDAYS	NXTWRKDAYS
2014-07-01 No NULL
2014-07-02 No NULL
2014-07-03 No NULL
2014-07-04 No NULL
2014-07-05 Yes NULL
2014-07-06 Yes NULL
2014-07-07 Yes NULL
2014-07-08 No NULL


We need to find out the next business days such that the output will look as

DATE	LEAVEDAYS	NXTWRKDAYS
2014-07-01 No 2014-07-02
2014-07-02 No 2014-07-03
2014-07-03 No 2014-07-04
2014-07-04 No 2014-07-05
2014-07-05 Yes 2014-07-08
2014-07-06 Yes 2014-07-08
2014-07-07 Yes 2014-07-08
2014-07-08 No 2014-07-09


The below outer-apply query will help to do so

declare @t table([DATE] DATE,LEAVEDAYS Varchar(10),NXTWRKDAYS DATE)

insert into @t Values

('2014-07-01','No',NULL),

('2014-07-02','No',NULL),

('2014-07-03','No',NULL),

('2014-07-04','No',NULL),

('2014-07-05','Yes',NULL),

('2014-07-06','Yes',NULL),

('2014-07-07','Yes',NULL),

('2014-07-08','No',NULL)

SELECT
t.[DATE],
t.LEAVEDAYS,
NXTWRKDAYS = x.[DATE]
FROM @t t
OUTER APPLY(
SELECT TOP 1 [DATE]
FROM @t
WHERE
[DATE] > t.[DATE]
AND LEAVEDAYS = CASE WHEN t.LEAVEDAYS = 'YES' THEN 'NO' ELSE LEAVEDAYS END
) x

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