Oracle表的SQL Server等效项。列（+）=值

我正在从事一个项目，该项目涉及将Oracle db迁移到SQL Server。我遇到了这样一个问题：

select <colums>
from Table1, Table2
where Table1.key = Table2.Key(+)
      and Table1.Column1(+) = 1234

只会

and Table1.Column1 = 1234 

工作，因为我认为我已经谈到了连接部分

select <colums>
from Table1 LEFT OUTER JOIN Table2 ON Table1.Key = Table2.Key
WHERE Table1.Column1 = 1234

and Table1.Column1 = 1234 

select <colums>
from Table1 LEFT OUTER JOIN Table2 ON Table1.Key = Table2.Key
WHERE Table1.Column1 = 1234