Distinct multi-column problem combined with GROUP by solution method

Table table1
ID regname postionsn PERSONSN
1 Shandong Qilu Pharmaceutical 223 2
2 Shandong Qilu Pharmaceutical 224 2
3 Beijing Construction Company 225 2
4 Technology companies 225 2

I want to get the result

ID regname postionsn PERSONSN
1 Shandong Qilu Pharmaceutical 223 2
3 Beijing Construction Company 225 2
4 Technology companies 225 2

SELECT DISTINCT REGNAME,POSTIONSN,PERSONSN from table1

If the query is for multiple columns distinct with and without the same

Only GROUP BY

With GROUP by Regname
SELECT * FROM table1 where ID in (select min (id) from table1 Group by Regname) and personsn=2