在11g中 SQL> select count(*) 2 from emp a, dept b, bonus c 3 where a.deptno(+) = b.deptno 4 and a.ename(+) = c.ename; where a.deptno(+) = b.deptno * ERROR at line 3: ORA-01417: a table may be outer joined to at most one other table
SQL>
在12C中 SQL> select count(*) 2 from emp a, dept b, bonus c 3 where a.deptno(+) = b.deptno 4 and a.ename(+) = c.ename; COUNT(*) ---------- 0 SQL>
