ORA Database Error Messages ORA-01799: a column may not be outer-joined to a subquery June 11, 2015 mpbod ORA-01799: a column may not be outer-joined to a subquery Cause: (+) () is not allowed. Action: Either remove the (+) or make a view out of the subquery. In V6 and before, the (+) was just ignored in this case. Back to previous menu https://support.oracle.com/ http://www.oracle.com/ Share this:Click to email a link to a friend (Opens in new window)Click to print (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on LinkedIn (Opens in new window)Click to share on Tumblr (Opens in new window)Click to share on Twitter (Opens in new window)Click to share on Pinterest (Opens in new window)Click to share on Reddit (Opens in new window)Click to share on Pocket (Opens in new window)