I'd be worried if it didn't produce the same result.

I was surprised to read this in DBD::Sybase, might be your client lib:

>DBD::Sybase supports the use of ? placeholders in SQL statements as long as the underlying library and database engine supports it. It does this by using what Sybase calls Dynamic SQL. The ? placeholders allow you to write something like: ...

In reply to Re^3: fetchall_arrayref hangs with placeholders query with no results by perlfan
in thread fetchall_arrayref hangs with placeholders query with no results by TieUpYourCamel

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