C:\Users\XXX>sqlplus / as sysdba

SQL*Plus: Release 10.2.0.5.0 - Production on 星期日 8月 28 15:51:42 2016

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连接到:
Oracle Database 10g Enterprise Edition Release 10.2.0.5.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options sys@XXX> select to_char('0.123','FM999999999990.00'),0.123 from dual; TO_CHAR('0.123', 0.123
---------------- ----------
0.12 .123 sys@XXX> select to_char('0.125','FM999999999990.00'),0.125 from dual; TO_CHAR('0.125', 0.125
---------------- ----------
0.13 .125

它的执行结果如下:

  ①其9代表:如果存在数字则显示数字,不存在则显示空格;

  ②其0代表:如果存在数字则显示数字,不存在则显示0,即占位符;

  ③其FM代表:删除如果是因9带来的空格,则删除之;

  ④四舍五入:0.125变成了0.13不知道大家注意到了没有。如果不要四舍五入,则需要trunc下;

05-11 22:34