oracle获取当天特定的时间

sql：

SELECT (

To_date(To_char(Trunc(SYSDATE), 'yyyy/mm/dd hh24:mi:ss'), 'yyyy/mm/dd hh24:mi:ss') + interval '7' hour

) as "now",
 (

To_date(To_char(Trunc(SYSDATE -1), 'yyyy/mm/dd hh24:mi:ss'), 'yyyy/mm/dd hh24:mi:ss') + interval '7' hour

)  as "e" 
 FROM dual

 

结果：