ob-sql: support for postgresql

  It achieves this in the same way the mysql support is done, by using
  the psql client with suitable command line arguments.

lisp/ob-sql.el

@@ -66,6 +66,8 @@ This function is called by `org-babel-execute-src-block'."
          (command (case (intern engine)
                     ('mysql (format "mysql %s -e \"source %s\" > %s"
                                     (or cmdline "") in-file out-file))
+		    ('postgresql (format "psql -A -P footer=off -F \"\t\"  -f %s -o %s %s"
+					 in-file out-file (or cmdline "")))
                     (t (error "no support for the %s sql engine" engine)))))
     (with-temp-file in-file
       (insert (org-babel-expand-body:sql body params)))