How to query GROUP BY Month in a Year

Question

I am using Oracle SQL Developer. I essentially have a table of pictures that holds the columns:

[DATE_CREATED(date), NUM_of_PICTURES(int)]

and if I do a select *

Answer 1

You can use:

    select FK_Items,Sum(PoiQuantity) Quantity  from PurchaseOrderItems POI
    left join PurchaseOrder PO ON po.ID_PurchaseOrder=poi.FK_PurchaseOrder
    group by FK_Items,DATEPART(MONTH, TransDate)