Question

Let’s take this query:

WITH temp as SELECT '123455' colum from dual
SELECT * FROM big_table WHERE cod IN (SELECT colum from temp)
UNION ALL
SELECT * FROM big_table2 WHERE cod IN (SELECT colum from temp)

I’d like to search for a list of values as well as I can look for one single, but how can I build a list of rows without having to write a lot of UNION?

Answer 1

If you have a string table type available, then the following script might do what you want

create table big_table
(
cod varchar2(4000)
);

create table big_table2
(
cod varchar2(4000)
);

insert into big_table (cod) values ('12345');
insert into big_table (cod) values ('12346');
insert into big_table (cod) values ('12347');

insert into big_table (cod) values ('12345');
insert into big_table (cod) values ('12348');
insert into big_table (cod) values ('12349');

--Example usage of the custom defined type stringarray
SELECT column_value from table(stringarray('12345','12348'));

WITH temp as (SELECT column_value from table(stringarray('12345','12348')))
SELECT * FROM big_table WHERE cod IN (SELECT column_value from temp)
UNION ALL
SELECT * FROM big_table2 WHERE cod IN (SELECT column_value from temp);

drop table big_table;
drop table big_table2;

You can create the stringarray type like this

CREATE OR REPLACE TYPE STRINGARRAY as table of varchar2(30)

I hope that answers your question.