我有以下的SQL查询:
select <misc things>
from pluspbillline
left outer join workorder
on workorder.siteid=pluspbillline.siteid
and workorder.wonum = pluspbillline.refwo
and workorder.orgid = pluspbillline.orgid
left outer join ticket
on ticket.ticketid = pluspbillline.ticketid
and ticket.class=pluspbillline.ticketclass
left outer join pluspsalesorder
on pluspsalesorder.salesordernum=pluspbillline.salesordernum
and pluspsalesorder.siteid=pluspbillline.siteid
在连接到DB2数据库的Oracle SQL Developer 4.0.0.13中,我在以下斜体文本下方得到了波浪线:"from pluspbillline"和"left outer join workorder"。警告显示:"pluspbillline与连接图的其余部分断开联系"。这是什么意思?