Match value with alternate position

Question

I want to self join a table on a column having value with alternate position, specifying the position is easy for one record, but I have thousands of record with different values. I'm not sure how to do it generally. I tried to match it by palindrome using reverse() but of course it's not the way to do it. I have a value like below:

Block	Range
A	1-10
A	10-1

I want to match the value as if 1-10=10-1 in general way.

Answer 1

As @Akina mentions, I tried parsing the table data with following query:

SELECT t.`Block`, 
LEAST(SUBSTRING_INDEX(t.`Range`,'-',1) ,SUBSTRING_INDEX(t.`Range`,'-',-1)) leastNumber,
GREATEST(SUBSTRING_INDEX(t.`Range`,'-',1) ,SUBSTRING_INDEX(t.`Range`,'-',-1)) greatestNumber
 FROM test_table t

which will give you results

Block	leastNumber	greatestNumber
A	1	10
A	1	10

And then may be you can join them with ease.