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Oracle SQL character data need sorted numerically

Posted on 2013-01-31
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Last Modified: 2013-01-31
I have a column in my database that has data that begins with numbers but can have letters, that is why it is a varchar field.  For example, 1, 1a, 2, 2a, 3, 3a, 4,5,6, 7, 8, 9 10
I need to sort it in ascending order, but it sorts like the following:
1
10
2
20
3
30

How can I get it to do that.????
Thank you.
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Question by:newtoperlpgm
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6 Comments
 
LVL 74

Expert Comment

by:sdstuber
ID: 38841367
select * from yourtable order by to_number(regexp_replace(yourcharacterfield,'[^0-9]'));
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LVL 74

Accepted Solution

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sdstuber earned 2000 total points
ID: 38841373
another variation

select * from yourtable order by to_number(regexp_substr(yourcharacterfield,'^[0-9]+'));
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Author Comment

by:newtoperlpgm
ID: 38841559
is there way to select it as a number rather than having to order by?
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Author Comment

by:newtoperlpgm
ID: 38841635
I tried the following but it doesn't work.
select regexp_subst(SAMPLE_NO,'^[0-9]+') from Table
Thanks.
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LVL 74

Expert Comment

by:sdstuber
ID: 38841640
put either of the conditions I used in the order by

select to_number(regexp_substr(yourcharacterfield,'^[0-9]+')) from yourtable

will return '123abc'  as 123



when you say "doesn't work"  - what doesn't work about it?

wrong results, error, no results, keyboard catches fire?
0
 
LVL 74

Expert Comment

by:sdstuber
ID: 38841651
simple test cases of either method

select to_number(regexp_substr(sample_no,'^[0-9]+')) from
(select '123abc' sample_no from dual);



select to_number(regexp_replace(sample_no,'[^0-9]')) from
(select '123abc' sample_no from dual)
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