Delete rows using sql 'like' command using data from another table

Question

I am trying to delete rows from a table ("lovalarm"), where the field ("pointid") is like any of several rows.

I currently enter them all manually, however I need to have a list of more than 100,000 options.

My thoughts are to have a table ("lovdata") containing all possible rows, and run a query to delete rows, where the field "likes" any of the rows in another table.

Can someone point me in the right direction as to how and how I can use, for example, this way?

Thanks a lot Cap

Answer 1

, LIKE:

DELETE FROM lovalarm a 
 WHERE EXISTS (SELECT NULL 
                 FROM lovdata d 
                WHERE a.pointid LIKE d.pointid)

lovdata.pointid , :

SQL> CREATE TABLE lovalarm AS
  2  SELECT 'AA' pointid FROM dual
  3  UNION ALL SELECT 'AB' FROM dual
  4  UNION ALL SELECT 'AC' FROM dual
  5  UNION ALL SELECT 'BA' FROM dual
  6  UNION ALL SELECT 'BB' FROM dual
  7  UNION ALL SELECT 'BC' FROM dual;    

Table created

SQL> --# suppose that you want to remove all entries that start
  2  --# with A or end with C
  3  CREATE TABLE lovdata AS
  4  SELECT 'A%' pointid FROM dual
  5  UNION ALL SELECT '%C' FROM dual;

Table created

SQL> DELETE FROM lovalarm a
  2   WHERE EXISTS (SELECT NULL
  3                   FROM lovdata d
  4                  WHERE a.pointid LIKE d.pointid);

4 rows deleted

SQL> select * from lovalarm;

POINTID
-------
BA
BB

Answer 2

, :

DELETE 
  FROM lovalarm
 WHERE pointid IN (SELECT mystring FROM lovdata)

EDIT: , LIKE , IN , . , .

Answer 3

here is an example with% concatenation

CREATE TABLE LOVALARM(POINTID VARCHAR2(50) ,TXT VARCHAR2(50));
create table deleteThese(deleteStringList varchar2(50));
/
INSERT INTO LOVALARM(POINTID, TXT) VALUES('abc def','1');
INSERT INTO LOVALARM(POINTID, TXT) VALUES('def','2');
INSERT INTO LOVALARM(POINTID, TXT) VALUES('abc','3');
INSERT INTO LOVALARM(POINTID, TXT) VALUES('efd','4');
INSERT INTO LOVALARM(POINTID, TXT) VALUES('abb','5');
INSERT INTO LOVALARM(POINTID, TXT) VALUES('efd bbb','6');
INSERT INTO LOVALARM(POINTID, TXT) VALUES('abb ccc','7');
INSERT INTO LOVALARM(POINTID, TXT) VALUES('abbbccc','8');


INSERT INTO DELETETHESE(DELETESTRINGLIST) VALUES('abc');
INSERT INTO DELETETHESE(DELETESTRINGLIST) VALUES('bbb');

COMMIT;
/

DELETE LOVALARM 
 where exists(
            SELECT NULL
              FROM DELETETHESE
             where LOVALARM.pointid like '%' || dELETETHESE.DELETESTRINGLIST  || '%'
        );

select * from LOVALARM;

POINTID                                            TXT                                                
-------------------------------------------------- -----
def                                                2                                                  
efd                                                4                                                  
ABB                                                5                                                  
abb ccc                                            7