无法绑定多部分标识符“ DB1..Students.studentnumber”

Question

SELECT
       (SELECT Grade
       FROM  DB2..Students
       WHERE   DB2..Students.studentnumber=DB1..Students.studentnumber             
          AND  ISNULL(Students.Disable,'')  != 'T'
    )  as test,* from DB2..Students

WHERE  studentnumber IN
       ( SELECT studentnumber FROM DB2..Students where              
           AND ISNULL(studentnumber,'') !=''
       AND ISNULL(Students.Disable,'')     != 'T'
)

What's wrong?

I am getting an error: "The multi-part identifier "DB1..Students.studentnumber" could not be bound."

Please help
Thanks

Answer 1

You appear to be using two tables named "Students". One in DB1 and one in DB2. You are referencing DB1..Students in your WHERE clause, but not in your FROM clause.