[英]how to add column value in postgresql?
我正在運行的查詢是
select
to_char(fs.order_item_id ,'99999999999')as Order_Item_Id ,
(case when (sum(fs.shipping_fee) < 0) then (-sum(fs.shipping_fee))else
sum(fs.shipping_fee) END) as Shipping_Fee_Charged ,
(case when (sum(se.shipping_fee) < 0) then (-sum(se.shipping_fee)) else
sum(se.shipping_fee) END) as Standard_Shipping_Charges ,
(case when (sum(fs.shipping_fee - se.shipping_fee) < 0) then (-
sum(fs.shipping_fee - se.shipping_fee)) else sum(fs.shipping_fee -
se.shipping_fee) END) as Error
from
"meta".fk_Payment as fs
join
"meta".ship_error as se
on
fs.order_item_id = se.order_item_id
where
(fs.order_status = 'delivered' and se.shipping_fee != 0 and(fs.shipping_fee-se.shipping_fee)< 0)
and
to_char(se.order_date, 'YYYY') = '2015'
and
to_char(se.order_date, 'Mon') = 'Feb'
group by
fs.order_item_id
limit 10;
如上述查詢中所述,計算列Shipping_Fee_Charged
, Standard_Shipping_Charges
, Error
並僅顯示10行。 現在,我想再次對這些列求和,只有10行。
我該怎么做?
您可以使用子查詢將結果存儲在臨時表(下面的代碼中為T1
)中,然后從該結果集中找到總和
SELECT SUM(T1.Shipping_Fee_Charged), SUM(T1.Standard_Shipping_Charges), SUM(T1.Error)
FROM (
SELECT
to_char(fs.order_item_id ,'99999999999')as Order_Item_Id ,
(case when (sum(fs.shipping_fee) < 0) then (-sum(fs.shipping_fee))else
sum(fs.shipping_fee) END) as Shipping_Fee_Charged ,
(case when (sum(se.shipping_fee) < 0) then (-sum(se.shipping_fee)) else
sum(se.shipping_fee) END) as Standard_Shipping_Charges ,
(case when (sum(fs.shipping_fee - se.shipping_fee) < 0) then (-
sum(fs.shipping_fee - se.shipping_fee)) else sum(fs.shipping_fee -
se.shipping_fee) END) as Error
FROM "meta".fk_Payment as fs
JOIN "meta".ship_error as se ON fs.order_item_id = se.order_item_id
WHERE (fs.order_status = 'delivered' and se.shipping_fee != 0 and(fs.shipping_fee-se.shipping_fee)< 0) AND to_char(se.order_date, 'YYYY') = '2015' AND to_char(se.order_date, 'Mon') = 'Feb'
GROUP BY fs.order_item_id
LIMIT 10
) AS T1
您還可以使用與上面類似的WITH Queries(公用表表達式)
WITH shipping_details AS (
SELECT
to_char(fs.order_item_id ,'99999999999')as Order_Item_Id ,
.
.
)
SELECT SUM(Shipping_Fee_Charged), SUM(Standard_Shipping_Charges), SUM(Error) FROM shipping_details
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.