我试图理解为什么在psql上使用ROUND函数时出现错误。我的查询看起来像这样
round(avg(minutes_at_pickup_loading_incl_drops) / 60.0,2) as avg_hrs_loading,
round(avg(proper_minutes_at_delivery_loading) / 60.0,2) as avg_hrs_unloading
我收到此错误：
No function matches the given name and argument types. You might need to add explicit type casts.
我也尝试过这种方法：
round(avg(minutes_at_pickup_loading_incl_drops)*1.0 / 60.0,2) as avg_hrs_loading,
round(avg(proper_minutes_at_delivery_loading)*1.0 / 60.0,2) as avg_hrs_unloading
但我仍然遇到相同的错误。请帮助我了解此错误的原因。谢谢