Get the first and the last day of the month...

Hi friends,

I'm trying to get the first and last day of a month and wants to implement that in the following code:

SELECT COALESCE (Date_A, Date_B, Date_C)
OF the double

Here Date A and B are in Format DD MM YYYY (March 14, 2008)
and Date like MM YYYY (March 2008)

How can I get the Date_C as of March 1, 2008, OR March 31, 2008 if Date A and B are NULL?

Thank you!

Published by: user11095386 on April 23, 2009 10:45

Hello

In my previous message, I thought that you were starting with strings like ' 03 12 2009"and you want to display in the form of" 12 March 2009'.» If what you have is just the opposite, then simply reverse strings format in my first message. Add a comma, if you want, in the format string.
I think that's what you want:

COALESCE ( TO_CHAR ( TO_DATE ( Date_A, 'fmMonth DD YYYY'), 'MM DD YYYY')
         , TO_CHAR ( TO_DATE ( Date_B, 'fmMonth DD YYYY'), 'MM DD YYYY')
         , TO_CHAR ( TO_DATE ( Date_C, 'fmMonth YYYY'),    'MM DD YYYY')
         )

Notice how, on the 3rd line, TO_DATE is called without DD in the format string:

TO_DATE ( Date_C, 'fmMonth YYYY')

When you do so, by default the day the 1st of the month, so that's all you need to do to convert the VARCHAR2 'March 2009' at the DATE of March 1, 2009.

If you would like the last day of the month, not the first, when Date_C is selected, then use LAST_DAY:

COALESCE ( TO_CHAR ( TO_DATE ( Date_A, 'fmMonth DD YYYY'), 'MM DD YYYY')
         , TO_CHAR ( TO_DATE ( Date_B, 'fmMonth DD YYYY'), 'MM DD YYYY')
         , TO_CHAR ( LAST_DAY ( TO_DATE ( Date_C
                                          , 'fmMonth YYYY'
                            )
                     )
             , 'MM DD YYYY'
             )
         )

Tags: Database

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