重复复制select title from employee_data;   +----------------------------+   | title                      |   +----------------------------+   | CEO                        |   | Senior Programmer          |   | Senior Programmer          |   | Web Designer               |   | Web Designer               |   | Programmer                 |   | Programmer                 |   | Programmer                 |   | Programmer                 |   | Multimedia Programmer      |   | Multimedia Programmer      |   1.2.3.4.5.6.7.8.9.10.11.12.13.14.15.16.