Do 2 multivalues fields (such as OPPORTUNITIES.COMPETITORS) have at least one common value?

Fri, 31 Jan 2020 14:05:10 +0000

I implemented an Oracle function :

create or replace FUNCTION CUSTOM_MULTIVALUES_MATCH(value_1 VARCHAR2, value_2 VARCHAR2)
RETURN NUMBER AS
value_exists NUMBER;
BEGIN
with value1(value1) as (
select regexp_substr(value_1,'[^;]+', 1, level) value1
from dual
connect by regexp_substr(value_1, '[^;]+', 1, level) is not null
)
,value2(value2) as (
select regexp_substr(value_2,'[^;]+', 1, level) value1
from dual
connect by regexp_substr(value_2, '[^;]+', 1, level) is not null
)
select (case when count(*) > 0 then 1 else 0 end) as "Match"
into value_exists
from value1 v1
inner join value2 v2 on v1.value1 = v2.value2;
return value_exists;
END;

Here is the result of the function for some test values :

CUSTOM_MULTIVALUES_MATCH(';1;2;',';1;') = 1
CUSTOM_MULTIVALUES_MATCH(';1;',';1;2;') = 1
CUSTOM_MULTIVALUES_MATCH(';1;2;',';3;4;') = 0

Here is a query returning the opportunities having at least one competitor in common with a given opportunity:

select o1.K_OPPORTUNITY, o1.NAME, o1.R_COMPETITORS
from 
R_OPPORTUNITIES o1, 
OPPORTUNITIES o2
where 
o1.K_OPPORTUNITY != o2.K_OPPORTUNITY
and o2.K_OPPORTUNITY = 2549
and CUSTOM_MULTIVALUES_MATCH(o1.COMPETITORS, o2.COMPETITORS) = 1;

Efficy Overflow Q&A - Recent questions tagged multivalues

Do 2 multivalues fields (such as OPPORTUNITIES.COMPETITORS) have at least one common value?