Oracle trunc()函数的用法
1.select trunc(sysdate) from dual
2.select trunc(sysdate, 'mm') from dual
3.select trunc(sysdate,'yy') from dual
4.select trunc(sysdate,'dd') from dual
5.select trunc(sysdate,'yyyy') from dual
6.select trunc(sysdate,'d') from dual
7.select trunc(sysdate, 'hh') from dual
8.select trunc(sysdate, 'mi') from dual
9.SELECT last_day(SYSDATE) FROM dual
10.SELECT to_char(last_day(sysdate), 'yyyy-mm-dd') FROM dual
11.SELECT add_months(last_day(sysdate), -1) FROM dual
12.select to_char(trunc(add_months(last_day(sysdate), -1) + 1), 'yyyy-mm-dd') FROM dual
1.select trunc(123.458) from dual
2.select trunc(123.458,0) from dual
3.select trunc(123.458,1) from dual
4.select trunc(123.458,-1) from dual
5.select trunc(123.458,-4) from dual
6.select trunc(123.458,4) from dual
7.select trunc(123) from dual
8.select trunc(123,1) from dual
9.select trunc(123,-1) from dual