与两个表之间没有共同关系的表B列值相比，从表A中检索列

Question

A new bird to SQL.

Table A name is EmployeeDetails which has four columns.

EmployeeID  FirstName,  LastName,  NativeState
        1     Frank        Dyre         FL
        2     John         Smith        AL
        3     Taylor       Cox          GA

Table B is CompanyDetails which has three columns

CompanyID   CompanyName  HeadQuatersState
 1           Steve's       FL
 2           Johnson       NY
 3           Huston        GA

Now in both the tables there is no same columns. But Native State and HeadQuatersStat have common states.

how can I retrieve first and lastname of an employee from employeeDetails table where the nativestate is not equals to company headquarters state.

Expected result is John Smith.

Answer 1

I think this is what your looking for

SELECT EmployeeID,FirstName + ' ' + LastName 'Employee'
FROM EmployeeDetails
WHERE NativeState NOT IN (SELECT HeadQuartersState
                            FROM CompanyDetails)