Ordering dot-delimited numeric sequences (e.g., version numbers)

Question

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:

Answer 1

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