How to retrieve the last day of the month .... Or Last date in the
week ?
Answer:
To add a addendum ... how can I find out the number of
days in a given month.
eg. If I were to give you '2003-03-01' I should get
31.
If you feel its a bit tricky in nature then ... See
the solutions below ...
DECLARE @Date datetime
SET @Date = '2000/02/1'
SELECT DATEADD(dd,-(DATEPART(dw, @Date) - 1),@Date) AS 'First day of the
week'
SELECT DATEADD(dd,-(DATEPART(dw, @Date) - 7),@Date) AS 'Last day of the
week'
SELECT DAY(DATEADD(d, -DAY(DATEADD(m,1,@Date)),DATEADD(m,1,@Date))) AS 'Last
day of the month'
Since the Last Day would yield you the number of days
in a month then it anwers my addendum question also. Some more solutions for
the number of days in a month are below:
DECLARE
@d DATETIME
SET @d = '2003-02-1'
select datepart(dd, dateadd(dd, -(datepart(dd, dateadd(mm, 1, @d))),dateadd(mm,
1, @d))) AS 'Last day of the month'
GO
DECLARE
@d DATETIME
SET @d = '2000-02-1'
SELECT CASE WHEN MONTH(@d) = 1
THEN 31
WHEN
MONTH(@d) = 2
THEN CASE
WHEN (YEAR(@d) % 4 = 0 AND YEAR(@d) % 100 <> 0) OR
YEAR(@d) % 400 = 0
THEN 29
ELSE 28
END
WHEN
MONTH(@d) = 3
THEN 31
WHEN
MONTH(@d) = 4
THEN 30
WHEN
MONTH(@d) = 5
THEN 31
WHEN
MONTH(@d) = 6
THEN 30
WHEN
MONTH(@d) = 7
THEN 31
WHEN
MONTH(@d) = 8
THEN 31
WHEN
MONTH(@d) = 9
THEN 30
WHEN
MONTH(@d) = 10
THEN 31
WHEN
MONTH(@d) = 11
THEN 30
WHEN
MONTH(@d) = 12
THEN 31
END AS 'Last day of the month'
Whew .... That's a mess to understand ... Believe me
they work ... :-) ... There are hundreds of way the SQL Selects can be done ...
This is just few of them ... And one more ...
SELECT
DAY(DATEADD(DAY,-1,DATEADD(MONTH,1,DATEADD(DAY,1-DAY(@d),@d))))
AS 'Last day of the month'
Note: Some of the tips and
tricks are subjected to some specific SQL Server settings hence use them with
loads of care.
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