Left outer Join between 2 Data Table or Data View

Hi all, i have a problem when i must generate query some data from SQL server dan Oracle and left join that.

It Easy if the 2 table come same database . But in this case , Table 1 from SQL server and Table 2 from Oracle.

query from SQL server have column like this : ColumnA,ColumnB
query from Oracle have column like this : ColumnB,ColumnC

so When i left outer join SQL server and Oracle , it must like this : ColumnA,ColumnB,ColumnC

i have idea to left outer join in application with data table or data view, but i don't know how to do that.

Any one can give me suggestion or link to provide solution to my problem?