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SQL return the closest matching date

Posted on 2013-02-03
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Last Modified: 2013-02-03
I have a date field that I want SQL to query in a optimized fashion and return the closest match, any suggestion?
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Question by:Mazdajai
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8 Comments
 
LVL 12

Expert Comment

by:tel2
ID: 38849726
Hi Mazdajai,

Are you saying you have a date field in a table and you want to find the record which contains the date which is closest to a date supplied by the user?

If so, how about you:
- subtract one date field from the other,
- sort the absolute value of those differences,
- and pick the lowest one (using "LIMIT 1").

Or do I misunderstand your requirements?
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LVL 21

Author Comment

by:Mazdajai
ID: 38849744
Yes, I solved it with LIMIT 1, but I am getting an error with 'mybirthdate does not exist' when I try to use it in the sub query:

with mybirthdate as (select birthdate from table1 t1
where birthdate >= '1960-01-01' and id <= 1000
order by birthdate
limit 1)
select *
from table2 t2
join t1 on t1.id = t2.id
where t2.birthdate = mybirthdate

ERROR: column "mybirthdate" does not exist
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LVL 12

Expert Comment

by:tel2
ID: 38849774
Q1. So are you saying you've already solved the problem outlined in your original question?

Q2. How is the above SQL query related to your original question?
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LVL 21

Author Comment

by:Mazdajai
ID: 38849789
It is somehow related because I am trying to use it in a sub query.
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LVL 12

Expert Comment

by:tel2
ID: 38849793
What is the answer to Q1, please Mazdajai.
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LVL 21

Author Comment

by:Mazdajai
ID: 38849797
Q1 - yes
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LVL 12

Accepted Solution

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tel2 earned 1500 total points
ID: 38849801
Good.  Please accept my answer and open another question to cover your new problem.

Thanks Mazdajai
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LVL 12

Expert Comment

by:tel2
ID: 38849815
Thanks for the points.
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