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create table WIRES ( ID int not null primary key clustered, WTYPE char(3) not null, WSIZE int not null ); create table PARTS( id int not null, PNAME varchar(50) null, WIRES_ID int not null )
insert into Wires(id, wtype,wsize) values(1,'ch',1),(2,'Ty',3); insert into Parts(id,pname,wires_id) values(1,null,1), (2,'bolt',1), (3,'Nut',2)
5 rows affected
SELECT w.WTYPE, w.WSIZE, p.PNAME FROM WIRES as w LEFT JOIN PARTS as p ON w.ID = p.WIRES_ID WHERE ( p.pname is null and not exists(select 1 from parts as s where p.wires_id =s.wires_id and s.pname is not null and p.id <> s.id) ) or p.pname is not null
WTYPE
WSIZE
PNAME
ch
1
bolt
Ty
3
Nut