oracle 中date类型精确可以年月日,时分秒,timestamp类型可以精确的秒一下
data转为timstamp
data 转为timstam可以函数to_timestamp的方式来转化:
SQL> Select to_timestamp('2006-01-01 12:10:10.1','yyyy-mm-dd hh24:mi:ss.ff') From dual; TO_TIMESTAMP('2006-01-0112:10:10.1','YYYY-MM-DDHH24:MI:SS.FF') ---------------------------------------------------------------------------
01-1月 -06 12.10.10.100000000 下午
timestamp转化为data
1, timestamp+0
SQL> select Systimestamp+0 FROM DUAL;
SYSTIMESTAMP+0 --------------
12-8月 -15
2, to_char的方式
SQL> Select to_char(Systimestamp,'yyyymmdd') From dual; TO_CHAR( --------
20150812
3,cast转化
SQL> Select Cast(Systimestamp As Date) From dual;
CAST(SYSTIMEST --------------
12-8月 -15