Question

Lets say that I have a table A. This table has ID, X_value, Y_value. Here is content of table A:

Table A

ID X_value Y_value
1  100     150
2  110     170
3  120     190

Now, if I’m comparing number 130 with range numbers(X_value – Y_value) I would like to get ID of range with smallest(minimal) difference! If I can name it that way? Right away we see that number 130 will fall into all this ranges, but I need ID of range with smallest(minimal) difference between 130 and numbers of range. To elaborate that difference:

For range 1: 130-100=30 and 150-130=20
For range 2: 130-110=20 and 170-130=40
For range 3: 130-120=10 and 190-130=60

From this elaboration we see that minimal difference is at third range(that is 10) so I would like to get ID 3. What will be a query for this example if I have this table within MySQL db?!

Answer 1

select * 
from yourtable
order by case when ABS(x-130)<ABS(y-130) then ABS(x-130) else ABS(y-130) end
limit 1

or

select id
from
(select id,x from yourtable union select id,y from yourtable) v
order by ABS(x-130) 
limit 1