这个函数输出什么

Question

round(12345.57896,-4)这句的结果是什么？

Answer 1

  1* select round(12345.57896,-4) from dual
SQL> /ROUND(12345.57896,-4)
---------------------
                10000
  1* select round(15345.57896,-4) from dual
SQL> /ROUND(15345.57896,-4)
---------------------
                20000这样不就明白了

Answer 2

SQL> select round(12345.57896,-4) from dual
  2  /ROUND(12345.57896,-4)
---------------------
                10000SQL> 多动手，多尝试~~~