SQL>
SQL> CREATE TABLE myTable(
2 e INTEGER,
3 f INTEGER
4 );
Table created.
SQL>
SQL> DELETE FROM myTable;
0 rows deleted.
SQL> INSERT INTO myTable VALUES(1, 3);
1 row created.
SQL> INSERT INTO myTable VALUES(2, 4);
1 row created.
SQL>
SQL> DECLARE
2 a myTable.e%TYPE;
3 b myTable.f%TYPE;
4 CURSOR myTableCursor IS
5 SELECT e, f
6 FROM myTable
7 WHERE e < f
8 FOR UPDATE;
9 BEGIN
10 OPEN myTableCursor;
11 LOOP
12 FETCH myTableCursor INTO a, b;
13 EXIT WHEN myTableCursor%NOTFOUND;
14 DELETE FROM myTable WHERE CURRENT OF myTableCursor;
15 INSERT INTO myTable VALUES(b, a);
16 END LOOP;
17
18 CLOSE myTableCursor;
19
20 END;
21
22 /
PL/SQL procedure successfully completed.
SQL>
SQL> drop table myTable;
Table dropped.
SQL>