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Semester 2/SQL Hell pt 2.txt

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+/* 1. list the snumber, sname, and pnumber for suppliers who supply parts but the condition of the joins is in the where clause */
+select supplier.snumber, sname, pnumber, jnumber
+from supplier, spj
+where spj.snumber = supplier.snumber
+
+/* 2. list the snumber, sname, and pnumber for suppliers USING SUBQUERIES aka nested selects */
+select snumber, (select a.sname from supplier as a where a.snumber = spj.snumber)
+pnumber, jnumber
+from spj 
+where spj.snumber in 
+(select supplier.snumber from supplier);
+
+/* 3. list the snumber, sname, and pnumber for suppliers USING SUBQUERIES aka nested selects */
+select snumber, (select a.sname from supplier as a 
+                where a.snumber = spj.snumber)
+				(select b.jname from project as b 
+				 where b.jnumber = spj.jnumber),
+				pnumber, jnumber
+from spj 
+where spj.snumber in 
+(select supplier.snumber 
+ 		from supplier);
+ 		
+
+/*4.  List the snumber, sname, pnumber, jnumber and jname for suppliers who supply parts but not the condition for all joins in there WHERE clause */
+
+select supplier.snumber, sname, spj.jnumber, jname
+from supplier, spj, project
+where supplier.snumber = spj.snumber AND
+spj.jnumber = project.jnumber;
+
+
+select * /* for i 0 to number of suppliers */
+from supplier 
+where  snumber in 
+	(select snumber /* for j 0 to number of tuples in spj */
+     from spj
+     where jnumber IN
+     (select jnumber /* for K 0 to number of tuples in project */
+      from project)
+     );