[英]how to add column value in postgresql?
My running query is 我正在运行的查询是
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;
as describe in above query calculate the column Shipping_Fee_Charged
, Standard_Shipping_Charges
, Error
and show only 10 rows. 如上述查询中所述,计算列
Shipping_Fee_Charged
, Standard_Shipping_Charges
, Error
并仅显示10行。 Now i want to sum these column again, only 10 row . 现在,我想再次对这些列求和,只有10行。
How i can do this ? 我该怎么做?
You can use a subquery to store the result in a temporary table ( T1
in the code below) and from that resultset find the sum 您可以使用子查询将结果存储在临时表(下面的代码中为
T1
)中,然后从该结果集中找到总和
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
You can also use WITH Queries (Common Table Expressions) , which is similar to the above 您还可以使用与上面类似的WITH Queries(公用表表达式)
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
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