12:56:38 jlanzpa817>select trunc(1.23333,2) from dual;            1.23
已用时间:  00: 00: 00.20
12:56:55 jlanzpa817>select trunc(1.235,2) from dual;          1.23
已用时间:  00: 00: 00.20
12:57:08 jlanzpa817>