select cast(to_timestamp('2011-09-14 12:52:42.123456789', 'syyyy-mm-dd hh24:mi:ss.ff') as date) timestamp_to_date from dual; 4、date型转成timestamp select cast(sysdate as timestamp) date_to_timestamp from dual; 5、两date的日期相减得出的是天数,而两timestamp的日期相减得出的是完整...
selectcast(sysdateastimestamp)date_to_timestamp from dual; 4、TO_TIMESTAMP_TZ(char[fmt[,’nls_param’]])函数:将符合特定日期和时间格式的字符串转变为TIMESTAMP WITH TIME ZONE类型。 Select TO_TIMESTAMP_TZ('2018-05-14','yyyy-mm-dd') from dual; 结果: 5、current_date、current_timestamp、lo...
select sysdate,systimestamp,to_char(systimestamp, 'yyyymmdd hh24:mi:ssxff6'), to_char(systimestamp, 'yyyymmdd hh24:mi:ss.ff6') from dual; 2、字符型转成timestamp select to_timestamp('2011-09-14 12:52:42.123456789', 'syyyy-mm-dd hh24:mi:ss.ff') from dual; 3、timestamp转成dat...
SELECTSYSDATE,ROUND(SYSDATE),ROUND(SYSDATE,'day'),ROUND(SYSDATE,'month'),ROUND(SYSDATE,'year')FROMdual; 结果: selectsysdate,trunc(sysdate),trunc(sysdate,'year')YEAR,to_char(trunc(sysdate,'hh'),'hh24')Hoursfromdual; 结果: 1select Days,2A,3trunc(A * 24) Hours,4trunc(A * 24 * 60 -...
SELECT sysdate + INTERVAL ‘1’ MINUTE AS new_date FROM dual; SELECT sysdate + INTERVAL ’30’ SECOND AS new_date FROM dual; “` 4、使用EXTRACT函数提取分钟和秒: EXTRACT函数可以从日期和时间值中提取特定的部分,如年份、月份、天、小时、分钟和秒。
使用TO_TIMESTAMP函数:TO_TIMESTAMP函数将一个字符串转换为时间戳。示例:SELECT TO_TIMESTAMP(‘2021-01-01 12:00:00’, ‘YYYY-MM-DD HH24:MI:SS’) FROM DUAL; 使用CAST函数:可以使用CAST函数将一个日期类型转换为时间戳类型。示例:SELECT CAST(SYSDATE AS TIMESTAMP) FROM DUAL; 使用EXTRACT函数:可以使...
select cast(sysdate as timestamp) date_to_timestamp from dual; 1. 4、获取timestamp格式的系统时间 select systimestamp from dual; 1. 5、两date的日期相减得出的是天数,而两timestamp的日期相减得出的是完整的年月日时分秒小数秒 select systimestamp-systimestamp from dual; ...
所以会有时区的差值。问题二：ORA-30076的含义就是非法的字段 Description: invalid extract field for extract source Cause: The extract source does not contain the specified extract field.使用以下语句可以执行：select extract(hour from cast(sysdate as timestamp)) from dual;...
2、timestamp转成date型 代码如下:select cast(to_timestamp('01-10月-08 07.46.41.000000000 上午','dd-MON-yy hh:mi:ss.ff AM') as date) timestamp_to_date from dual;3、date型转成timestamp 代码如下:select cast(sysdate as timestamp) date_to_timestamp from dual;4、获取time...