我有这个问题。我有一个 sql 查询正在尝试对我的 postgres 数据库进行。这些查询在 oracle 中运行良好，但正在将其转换为 postgres 查询，但它会抱怨。这是查询：
select to_char(calldate,'Day') as Day, date_trunc(calldate) as transdate,
Onnet' as destination,ceil(sum(callduration::integer/60) )as total_minutes,round(sum(alltaxcost::integer) ,2)as revenue
from cdr_data
where callclass ='008' and callsubclass='001'
and callduration::integer >0
and regexp_like(identifiant,'^73')
and bundleunits = 'Money'
and inserviceresultindicator in (0,5)
and regexp_like(regexp_replace(callednumber,'^256','') ,'^73')
group by to_char(calldate,'Day') ,trunc(calldate),'Onnet' order by 2
我得到的错误是：
Err] ERROR: function date_trunc(timestamp without time zone) does not exist
LINE 4: select to_char(calldate,'Day') as Day, date_trunc(calldate)...
我做错了什么，或者这个错误的解决方案是什么？