From the DBD::Sybase docs: 
DBD::Sybase supports the use of ? placeholders in SQL statements as lo
+ng as the underlying library and database engine supports it.

[download]

So it's possible that the database engine you are using does not support placeholders. Certainly, I know this is the case with FreeTDS, as documented here.

If this is the problem in your case, then the solution would probably be to switch to ODBC.

Hope this helps,
Darren :)

In reply to Re: Placeholders(?) in the prepare statements for executing DBD::Sybase queries by McDarren
in thread Placeholders(?) in the prepare statements for executing DBD::Sybase queries by santhi

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