Oracle uses an SQL to find out which data is not in a table

Ideas ： Convert these data strings into multiline records , Then compare .

Refer to the ：oracle How to convert a string to multiple lines _ Yabingshi's blog -CSDN Blog

# Find out SMITH,jiao,zhangsan,lisi Which of these people are not there scott.emp in

select * from(
with a as 
(
select ',SMITH,jiao,zhangsan,lisi' name 
from dual
)
select regexp_substr(name,'[^,]+',1,rownum) name
from a
connect by rownum<=length(regexp_replace(name,'[^,]+'))
)
where name not in (select ename from scott.emp)