Oracle Select From JSON Array - sql

Question

I have a table for some 'settings' and in that table I have a record with a json array. It is a simple array, like this:
"['scenario1','scenario2','scenario3']"
I want to use a sub-select statement in a view to pull this information out so I can use it like this:
select * from table where field_scenario in (select ????? from settings_table where this=that)
I have been looking through documentation and googling for this but for the life of me I can't figure out how to 'pivot' the returning array into individual elements in order to use it.
Oracle 12c I believe, thanks in advance.

Answer 1

Do NOT use regular expression to parse JSON. Use a proper JSON parser:
select *
from table_name
where field_scenario in (
SELECT j.value
FROM settings_table s
OUTER APPLY (
SELECT value
FROM JSON_TABLE(
s.json,
'$[*]'
COLUMNS(
value VARCHAR2(50) PATH '$'
)
)
) j
)
Which, for the sample data:
CREATE TABLE settings_table ( json CLOB CHECK ( json IS JSON ) );
INSERT INTO settings_table ( json ) VALUES ( '["scenario1","scenario2","scenario3"]');
INSERT INTO settings_table ( json ) VALUES ( '["scenario5"]');
INSERT INTO settings_table ( json ) VALUES ( '["scenario \"quoted\""]');
INSERT INTO settings_table ( json ) VALUES ( '["scenario2,scenario4"]');
CREATE TABLE table_name ( id, field_scenario ) AS
SELECT LEVEL, 'scenario'||LEVEL FROM DUAL CONNECT BY LEVEL <= 6 UNION ALL
SELECT 7, 'scenario "quoted"' FROM DUAL;
Outputs:
ID | FIELD_SCENARIO
-: | :----------------
1 | scenario1
2 | scenario2
3 | scenario3
5 | scenario5
7 | scenario "quoted"
db<>fiddle here