Initial data commit

Task/Hash-join/SQL/hash-join-1.sql

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+-- setting up the test data
+
+create table people (age number(3), name varchar2(30));
+insert into people (age, name)
+  select 27, 'Jonah'  from dual union all
+  select 18, 'Alan'   from dual union all
+  select 28, 'Glory'  from dual union all
+  select 18, 'Popeye' from dual union all
+  select 28, 'Alan'   from dual
+;
+
+create table nemesises (name varchar2(30), nemesis varchar2(30));
+insert into nemesises (name, nemesis)
+  select 'Jonah', 'Whales'  from dual union all
+  select 'Jonah', 'Spiders' from dual union all
+  select 'Alan' , 'Ghosts'  from dual union all
+  select 'Alan' , 'Zombies' from dual union all
+  select 'Glory', 'Buffy'   from dual
+;

Task/Hash-join/SQL/hash-join-2.sql

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+select /*+ use_hash */ * from people join nemesises using(name);