Just a pet peeve for the most part, but I prefer using parens even when they are not strictly needed just to improve clarity of intent. Seems to help me, anyway. 

my $stmt = join(" ", "select * from dbo.server" , (defined($orderby) ?
+ "order by $orderby;" : ";"));

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On a side note, I presume you have a space in front of the word "order" in your true clause. I.e. " order by $orderby;" or else you would wind up with SQL that read something like this: select * from dbo.serverorder by .... That would clearly be wrong.

In reply to Re^2: Using join and ternary operator together by boftx
in thread Using join and ternary operator together by id007

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