Sort numbers (and numbers+letters) with sqlite

问题

I'm trying to sort a VarChar field with Sqlite.

The field can contain numbers or numbers+letters, but I need to sort in numerical order, like this:

1
1a
1b
5
5x
5y
10
10d
10e
10g1
11
11a
11b
100c
100f

Any ideas? I've been able to do this... it is close (but not quite) what I need:

Pad the start of the field with '00000', and then sort on the 1st five letters

回答1:

Easy

select col from tbl order by col*1, col

回答2:

There's no easy way to do this with the built-in functions. Use sqlite3_create_collation (or the equivalent wrapper in your preferred programming language) to define a string comparison function that implements natural sort.

来源：https://stackoverflow.com/questions/5189511/sort-numbers-and-numbersletters-with-sqlite