Find manglende data sendt til SQL in-clause

Du kan bruge union for at bygge tabel over byer og derefter minus operatør.

select 'Dallas' as city from dual union all 
select 'Berlin' as city from dual union all 
select 'Cracow' as city from dual union all 
select 'Praha'  as city from dual  
minus
select city from address

I stedet for union kan du bruge den foruddefinerede type odcivarchar2list , som forkorter syntaks:

select column_value as city 
  from table(sys.odcivarchar2list('Dallas', 'Berlin', 'Cracow', 'Praha'))
minus
select city from address

... og i stedet for minus Du kan bruge joins eller not in eller not exists .

Testdata og output af begge forespørgsler:

create table address (id number, city varchar2(10));
insert into address values (1, 'Rome');
insert into address values (2, 'Dallas');
insert into address values (3, 'Cracow');
insert into address values (4, 'Moscow');
insert into address values (5, 'Liverpool');
insert into address values (6, 'Cracow');
insert into address values (7, 'Seoul');

CITY
------------
Berlin
Praha