sqlite数据库执行full outer join

 sqlite数据库执行full outer join时提示：RIGHT and FULL OUTER JOINs are not currently supported。

sqlite数据库不支持（+），不支持右外连接（right outer join）和全外连接(full outer join)，但支持左外连接（left outer join）。我们可以利用这一点来得到全外连接的结果

1.left outer join

Select * From aa left outer join  bb on aa.id=bb.id

2.right outer join

select * from bb left outer join aa on aa.id=bb.id

3.full outer join

Select aa.*,bb.* from aa left outer join bb on aa.id=bb.id

union

select aa.*,bb.* from bb left outer join aa on aa.id=bb.id