text field with numeric values for sorting
I'm having a problem my sort. Usually, when the column follows a format, I can use a combination of INSTR and LPAD to sort correctly. In this new case, my columns does not follow a specific format.Sample data:
with t as(
select 'xxx 10 MG yyy' sortcol from dual union
select 'xxx 5 MG yyy' from dual union
select 'xxx 28 MG yyy' from dual union
select 'aa 10% 12.5 ' from dual union
select 'aa 6.25% 12.5' from dual union
select '222 zzz 30/17.5' from dual union
select '222 zzz 30/5.5' from dual
)
select * from t
SORTCOL
222 zzz 30/17.5
222 zzz 30/5.5
aa 10% 12.5
aa 6.25% 12.5
xxx 10 MG yyy
xxx 28 MG yyy
xxx 5 MG yyy
I want to sort the data in the222 zzz 30/5.5
222 zzz 30/17.5
aa 6.25% 12.5
aa 10% 12.5
xxx 5 MG yyy
xxx 10 MG yyy
xxx 28 MG yyy
I'm trying to replace all numerical values in the string to have 4 digits. For example:xxx yyy MG 0010
xxx yyy MG 0028
xxx yyy 0005 MG
0222 zzz 0030/0017.0005
0222 zzz 0030/0005.0005
If Oracle will sort correctly digital in the form of text fields. I thought I found the solution with the regular expression:
select regexp_replace('x10x100x6.5x','([0-9]+)',lpad('\1', 4,0)) from dual
x0010x00100x006.005x
But the problem is that the backreference in the LPAD overrides the value before it run LPAD. He treats her like the literal string '\1' as oppose to the reference value: 10, 1, 6, and 5. Therefore, LPAD think length is always 2, length ('\1') = 2 instead of length('100') = 3.Is there another method to develop all the numbers? Thank you for your time.
Hello
You can do with nested REGEXP_REPLACEs:
SELECT sortcol
, REGEXP_REPLACE ( REGEXP_REPLACE ( sortcol
, '([0-9]+)'
, '000\1'
)
, '[0-9]+([0-9]{4})'
, '\1'
) AS four_digits
FROM t
ORDER BY four_digits
;
You probably don't want to display the string converted; you want to just ORDER BY it. It is included in the SELECT clause only if you could see what it was, for the tests.
Output:
SORTCOL FOUR_DIGITS
--------------- ------------------------------
222 zzz 30/5.5 0222 zzz 0030/0005.0005
222 zzz 30/17.5 0222 zzz 0030/0017.0005
aa 6.25% 12.5 aa 0006.0025% 0012.0005
aa 10% 12.5 aa 0010% 0012.0005
xxx 5 MG yyy xxx 0005 MG yyy
xxx 10 MG yyy xxx 0010 MG yyy
xxx 28 MG yyy xxx 0028 MG yyy
As you can see, the inner REGEXP_REPLACE adds 3 leading 0 to each number, if she need to 0, 1, 2, or 3. This means that each number will be at least 4 digits, but maybe more. The external REGEXP_REPLACE replaces 4 digits with the last 4 digits only.
Thanks for posting the sample data in a useful form. The description of the problem was very clear, and it was useful to see that you had already tried and your results on why it does not work. I wish we could mark questions as "Correct." This one was really were.
Published by: Frank Kulash, January 21, 2011 16:20
Tags: Database
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