case insensitive sort for output from SELECT

Is there any way to alphabetically sort the output of a select
statement correctly?

what I'm using at the moment is
SELECT data FROM table ORDER BY DATA ASC
which gives (for example)
A
B
C
a
b

Is there any way to rig this so that it sorts 'properly', i.e. both
the a's come together?

Given what I'm working on, I could use either a pure SQL solution or
some perl to put around the perl DBI.

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