I am using python and MySQL and I have the following table:
id name value1 value2
1 a 36041 140636
2 b 36046 140647
3 c 36042 140642
4 d 36042 140645
5 e 36040 140642
I want to select all those rows which have almost same value1 and value2 (±2). So based on the table above, I want to select row 3 and row 5 only and arrange them in increasing order of value1. How should I write the SELECT query for this?
One way to achieve this by using self-join:
select t1.*
from table1 t1
join table1 t2
on abs(t1.value1 - t2.value1) <= 2
and abs(t1.value2 - t2.value2) <= 2
and t1.id <> t2.id
order by t1.value1
And see demo in Rextester.
I think you want a self join:
select t1.*, t2.*
from t t1 join
t t2
on abs(t1.value1 - t2.value1) <= 2 and
abs(t1.value2 - t2.value2) <= 2 and
t1.id < t2.id
order by t1.value1
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