Data commit

Task/Set/SQL/set.sql

@@ -0,0 +1,83 @@
+-- set of numbers is a table
+-- create one set with 3 elements
+
+create table myset1 (element number);
+
+insert into myset1 values (1);
+insert into myset1 values (2);
+insert into myset1 values (3);
+
+commit;
+
+-- check if 1 is an element
+
+select 'TRUE' BOOL from dual
+where 1 in
+(select element from myset1);
+
+-- create second set with 3 elements
+
+create table myset2 (element number);
+
+insert into myset2 values (1);
+insert into myset2 values (5);
+insert into myset2 values (6);
+
+commit;
+
+-- union sets
+
+select element from myset1
+union
+select element from myset2;
+
+-- intersection
+
+select element from myset1
+intersect
+select element from myset2;
+
+-- difference
+
+select element from myset1
+minus
+select element from myset2;
+
+-- subset
+
+-- change myset2 to only have 1 as element
+
+delete from myset2 where not element = 1;
+
+commit;
+
+-- check if myset2 subset of myset1
+
+select 'TRUE' BOOL from dual
+where 0 =  (select count(*) from
+(select element from myset2
+minus
+select element from myset1));
+
+-- equality
+
+-- change myset1 to only have 1 as element
+
+delete from myset1 where not element = 1;
+
+commit;
+
+ -- check if myset2 subset of myset1 and
+ -- check if myset1 subset of myset2 and
+
+select 'TRUE' BOOL from dual
+where
+0 =  (select count(*) from
+(select element from myset2
+minus
+select element from myset1)) and
+0 =
+(select count(*) from
+(select element from myset1
+minus
+select element from myset2));