*Screams into the void*

Semester 2/SQL Hell pt5.txt

@@ -0,0 +1,35 @@
+/* list the supplier number and supplier name for suppliers who DO NOT supply any parts USE subqueries*/
+select snumber
+from supplier
+where not exists
+(select *
+	from spj
+		where spj.snumber = supplier.snumber);
+		
+		
+/* list the supplier number and supplier name for suppliers who DO NOT supply any parts USE subqueries*/
+select snumber
+from supplier
+where snumber in /* you may use a NOT in and and omit the FALSE at the end */
+(select *
+	from spj
+		where spj.snumber = supplier.snumber) = false;
+
+select snumber
+from supplier
+where snumber in
+(select snumber from spj) = false;
+
+/* AAAAAAAAAAAAAAAAAA */
+
+select distinct snumber
+from spj as c 
+where not exists 
+
+(select *
+ 	from project as a cross join spj as b 
+ 	where c.snumber = b.snumber and not exists 
+ 
+ 	(select * 
+     from spj
+     	where b.snumber=spj.snumber and a.jnumber = spj.jnumber))