Go Premium for a chance to win a PS4. Enter to Win

x
?
Solved

Calculating age based on month

Posted on 2014-10-17
9
Medium Priority
?
163 Views
Last Modified: 2014-10-17
If I am calculating age based on "date" using this query

select * 
from tblregistrations
WHERE  YEAR('20140701') - YEAR(DOB)
        - ( CASE
               WHEN MONTH(DOB) > MONTH('20140701')
                 OR ( MONTH(DOB) = MONTH('20140701')
                    AND DAY(DOB) > DAY('20140701')
                    )
               THEN 1
               ELSE 0
             END )  < 18

Open in new window


How can I calculate based on "month" only?  Thanks for helping this novice sql person.
0
Comment
Question by:al4629740
  • 4
  • 3
  • 2
9 Comments
 
LVL 49

Expert Comment

by:PortletPaul
ID: 40387609
please provide an example of what you mean by "month only"

is the DOB "month only"?
are you still comparing to the constant '20140701'?
an example would really help
0
 

Author Comment

by:al4629740
ID: 40387621
No, the new constant will be the month

1
2
3
4
5
6
7
8
9
10
11
12
0
 
LVL 70

Expert Comment

by:Scott Pletcher
ID: 40387631
If you want to see if a person is less than a certain age, you can just calculate the "controlling date", and then test for the DOB < that.  Something like this:

select *
from tblregistrations
WHERE  
    DOB < DATEADD(YEAR, -18, '20140701')
0
Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 

Author Comment

by:al4629740
ID: 40387644
No, I just want to calculate their age based on current MONTH and DOB
0
 
LVL 70

Accepted Solution

by:
Scott Pletcher earned 2000 total points
ID: 40387647
DATEDIFF(MONTH, DOB, GETDATE()) / 12
0
 

Author Comment

by:al4629740
ID: 40387650
So I can basically stick whatever date I am comparing to in the GETDATE() section?

For example:

DATEDIFF(MONTH, DOB, GETDATE()) / 12
or
DATEDIFF(MONTH, DOB, '12/1/2014') / 12
or
DATEDIFF(MONTH, DOB, variable) / 12
0
 
LVL 49

Expert Comment

by:PortletPaul
ID: 40387653
So "current month" can be treated as "1st of" the current month, and the calculation method remains the same.

declare @datum as date
set @datum = (select DATEADD(dd, - (DAY(getdate()) - 1), cast(getdate() as date) ) )

select * 
from tblregistrations
WHERE  YEAR(@datum) - YEAR(DOB)
        - ( CASE
               WHEN MONTH(DOB) > MONTH(@datum)
                 OR ( MONTH(DOB) = MONTH(@datum)
                    AND DAY(DOB) > DAY(@datum)
                    )
               THEN 1
               ELSE 0
             END )  < 18

Open in new window

line 2 above calculates "1st day of current month"
0
 
LVL 70

Expert Comment

by:Scott Pletcher
ID: 40387655
Yep, that should be it, if all you're worried about is the month of the dob.
0
 

Author Comment

by:al4629740
ID: 40387659
Yes, it would be comparing the month of DOB to month of whatever I specify
0

Featured Post

Free Tool: Path Explorer

An intuitive utility to help find the CSS path to UI elements on a webpage. These paths are used frequently in a variety of front-end development and QA automation tasks.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

In this article we will learn how to fix  “Cannot install SQL Server 2014 Service Pack 2: Unable to install windows installer msi file” error ?
What if you have to shut down the entire Citrix infrastructure for hardware maintenance, software upgrades or "the unknown"? I developed this plan for "the unknown" and hope that it helps you as well. This article explains how to properly shut down …
Familiarize people with the process of utilizing SQL Server functions from within Microsoft Access. Microsoft Access is a very powerful client/server development tool. One of the SQL Server objects that you can interact with from within Microsoft Ac…
Viewers will learn how to use the INSERT statement to insert data into their tables. It will also introduce the NULL statement, to show them what happens when no value is giving for any given column.

886 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question