mysql sorting of version numbers

Question

I have values like:

1.1.2 
9.1 
2.2
4
1.2.3.4
3.2.14
3.2.1.4.2
.....

I need to sort those values using mysql. The data type for this one is varbinary(300).

The desired output will be like:

1.1.2
1.2.3.4
2.2
3.2.1.4.2
3.2.14
4
9.1

The Query is:

select version_number from table order by version_number asc 

it does not give the correct sorting order.

The desired output of this is:

1.1.2
1.2.3.4
2.2
3.2.1.4.2
3.2.14 
4
9.1

The version numbers are up to 20 digits (like 1.2.3.4.5.6.7.8.9.2.34) and more also. There is no particular max size and the standard version is just like above mentioned.

Answer 1

Try abusing the INET_ATON function to do the sorting like so:

SELECT version_number FROM table ORDER BY INET_ATON(SUBSTRING_INDEX(CONCAT(version_number,'.0.0.0'),'.',4))

This trick was originally posted on the mysql mailing list, so many thanks to the original poster, Michael Stassen!

Here's what he had to say:

If each part is no larger than 255, you can leverage INET_ATON() to do what you want (up to the 4th part). The trick is making each of these look like an IP first by using CONCAT to add '0.0.0' to make sure every row has at least 4 parts, then SUBSTRING_INDEX to pull out just the first 4 parts.

Now, I must point out that because we are sorting on a function of the column, rather than on the column itself, we cannot use an index on the column to help with the sort. In other words, the sorting will be relatively slow.

In the latter case, he recommends a solution similar to the one posted by @spanky (separate columns).

Answer 2

I would store it in three separate columns, one for each part of the version number.

Make each column a TINYINT and even create an index across the 3 columns. That should make things simple.

Then you can do: select CONCAT(v1,'.',v2,'.',v3) AS version_number FROM table ORDER BY v1 asc, v2 asc, v3 asc