In my database I've column fill this data:
1
1.1
1.1.1
1.1.1.1
1.1.2
1.10
1.11
1.2
1.9
I want to sort it, to get result looks like this:
1
1.1
1.1.1
1.1.1.1
1.1.2
1.2
1.9
1.10
1.11
How can I accomplish this? Simple use "ORDER BY" gives wrong result because it's lexicographic order.
You could split the string to an array, cast it to an int[]
and rely on Postgres' natural ordering for arrays:
SELECT mycolumn
FROM mytable
ORDER BY STRING_TO_ARRAY(mycolumn, '.')::int[] ASC
Casting to cidr
will do the trick (if the numbers are well-behaved)
DROP table meuk;
CREATE table meuk
( id SERIAL NOT NULL PRIMARY KEY
, version text
);
INSERT INTO meuk(version) VALUES
('1' )
, ('1.1' )
, ('1.1.1' )
, ('1.1.1.1' )
, ('1.1.2' )
, ('1.10' )
, ('1.11' )
, ('1.2' )
, ('1.9' )
;
SELECT * FROM meuk
ORDER BY version::cidr
;
Result:
INSERT 0 9
id | version
----+---------
1 | 1
2 | 1.1
3 | 1.1.1
4 | 1.1.1.1
5 | 1.1.2
8 | 1.2
9 | 1.9
6 | 1.10
7 | 1.11
(9 rows)
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