我在Oracle中构建了一个关系数据模型，现在使用Python创建了一个GUI。我需要一个SQL语句在IDE中执行，但是得到一条cx_Oracle.DatabaseError: ORA-00936: missing expression错误消息。这是一个在TOAD中运行良好的CTE，当我删除CTE并放入一个简单的SQl语句时，它执行得很好。在

我可以在我的数据库中构建一个视图并执行select * from，但我不想这样。在

我是Python新手，所以我确信有更好的方法来实现这一点。在import cx_Oracle

con = cx_Oracle.connect('Example', 'Example', "Example")

cur = con.cursor()

statement = ("with r1 as (" +

" select " +

" r.PARENT_ITEM_id, " +

" D.SC_ID, " +

" --F.TONS" +

" SUM(ROUND(F.TONS*Pic_Distro*2000*s.stk_lvl_mult)) as Stocking_Lvl" +

" from PIC_DISTRO_TBL D" +

" Left Join Part_Velocity_TBL P on (P.item_ID = D.Item_ID and D.SC_ID = P.SC_ID)" +

" Left Join Forecast_TBL F on (D.Bucket_ID = F.Bucket_ID and D.SC_ID =F.SC_ID)" +

" left join Stock_lvl_tbl S on (S.Velocity_id = P.VELOCITY_ID)" +

" left join item_tbl I on (i.item_ID = D.ITEM_ID)" +

" left join parent_item_tbl R on (r.PARENT_ITEM_id = i.PARENT_ITEM_id)" +

" Where F.MTH = '4'" +

" and F.YEAR = '2017'" +

" and P.Velocity_id in ('A','B','C')" +

" and D.SC_ID in ('01','02')" +

" -- and SUM(ROUND(F.TONS*Pic_Distro*2000*s.stk_lvl_mult)) > 0" +

" Group by " +

" r.PARENT_ITEM_id, D.SC_ID " +

" Order by " +

" D.SC_ID DESC, Stocking_lvl DESC" +

")," +

"R2 as (" +

"select r.Parent_Item_ID, o.SC_ID, " +

"coalesce(sum(avail_wt), 0) as Avail_Wt" +

" from" +

" open_inv_tbl O" +

" left join item_tbl I on (i.item_ID = o.ITEM_ID)" +

" left join parent_item_tbl R on (r.PARENT_ITEM_id = i.PARENT_ITEM_id)" +

" Where r.Parent_item_ID is not null" +

" Group by r.Parent_Item_ID,o.SC_ID)" +

"select " +

" r1.PARENT_ITEM_id, " +

" R1.SC_ID, R1.Stocking_Lvl , " +

" coalesce(R2.Avail_wt, 0 ) as Avail_Wt, " +

" coalesce(R2.Avail_wt/R1.Stocking_Lvl, 0) as Precantage" +

" From R1" +

" left join R2 on (R1.parent_item_id = R2.parent_item_id and R1.Sc_ID = R2.Sc_ID) " +

" Where R1.Stocking_lvl > '0' " +

" Order by SC_id Desc, Stocking_Lvl Desc)" )

cur.arraysize = 2000

cur.execute(statement)