这是原始表的数据，一共是4列，分别是日期，油田ID，产液量，产油量

我的需求是查询出每天每个油田的产液量、产油量、当月累计产液量、当月累计产油量、当年累计产液量、当年累计产油量

下边是我写的sql语句：

select t.thedate,t.id_field,t.liquid,t.test_oil,

--月累计

(select sum(t1.liquid) from TJ_FIELD_PROD_DAILY t1 where t1.id_field=t.id_field and t1.thedate<=t.thedate and t1.thedate>=(select trunc(t.thedate,'mm') from dual)),
(select sum(t1.test_oil) from TJ_FIELD_PROD_DAILY t1 where t1.id_field=t.id_field and t1.thedate<=t.thedate and t1.thedate>=(select trunc(t.thedate,'mm') from dual)),

--年累计
(select sum(t1.liquid) from TJ_FIELD_PROD_DAILY t1 where t1.id_field=t.id_field and t1.thedate<=t.thedate and t1.thedate>=(select trunc(t.thedate,'yyyy') from dual)),
(select sum(t1.test_oil) from TJ_FIELD_PROD_DAILY t1 where t1.id_field=t.id_field and t1.thedate<=t.thedate and t1.thedate>=(select trunc(t.thedate,'yyyy') from dual)) 

from TJ_FIELD_PROD_DAILY t

这样一共写了4个子查询，查询效率很慢，我想问有没有办法可以把这4个子查询合并成2个，即一个子查询查两个字段，因为查询的条件都是一样的。求大神指点！