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According to the sqlite3 documentation,
The COLLATE clause following each
column name defines a collating
sequence used for text entries in that
column. The default collating sequence
is the collating sequence defined for
that column in the CREATE TABLE
statement. Or if no collating sequence
is otherwise defined, the built-in
BINARY collating sequence is used.
What does a collating sequence do, and what is a BINARY collating sequence?
It is the way that the sql engine orders data internally. Binary Collation does what it suggests, it does a binary comparison. Generally its the fastest collation though I have never quantified it, as it checks bit patterns, which means it is case and accent sensitive.