1,查询本周数据
select * from t_Engine_Process_Workitem where start_time >sysdate-to_char(sysdate-1,'D')
备注:start_time指的是要查询的字段,条件
2,查询本月数据
select * from t_Engine_Process_Workitem where start_time>=TRUNC(SYSDATE, 'MM') and start_time<=last_day(SYSDATE)
3,查询本年数据
select * from 表 where 查询字段>=TRUNC(SYSDATE, 'MM') and time<=last_day(SYSDATE)
例:select * from t_Engine_Process_Workitem where start_time>=TRUNC(SYSDATE, 'MM') and start_time<=last_day(SYSDATE)