## `rightJoin`
此方法用于指定RIGHT JOIN查詢
## 示例：
~~~
db.name('user').alias('a').rightJoin('info b', 'a.id = b.userid').select()
~~~
~~~
db.name('user')\
.alias('a')\
.rightJoin('info b', 'a.id = b.userid')\
.rightJoin('work c', 'a.id = c.userid')\
.select()
~~~
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