Correlated Subquery

 Hi
I was trying an example of subquery
Create Table #Temp
(
    PK_ID int identity(1,1),
    sName Varchar(50)
)

Create Table #TempAddress
(
    PK_ID int identity(1,1),
    PersonID int,
    Address Varchar(100)
)


Insert Into #Temp Values('Karan')
Insert Into #Temp Values('Gupta')
Insert Into #Temp Values('Karan')
Insert Into #Temp Values('Karan')

Insert Into #TempAddress Values(1,'Address1')
Insert Into #TempAddress Values(2,'Address2')
Insert Into #TempAddress Values(3,'Address3')



select PK_ID from #Temp a where (select PK_ID from #TempAddress b where a.PK_ID = b.PersonID)


Drop Table #Temp
Drop Table #TempAddress
But I am getting an error
Msg 4145, Level 15, State 1, Line 29
An expression of non-boolean type specified in a context where a condition is expected, near 'Drop'.
 
Am i doing something wrong.
Kindly advice
Regards
Karan