Question

我发现无需使用group by就无法获得行数非常烦人。我只需要获得＆＃34;总计数＆＃34;我的子查询返回。

这是我的子查询的样子：

select sales_flat_order.increment_id, sales_flat_order.created_at, sales_flat_order.status, dispatch.dispatch_date, 
DATEDIFF(TO_DATE(dispatch.dispatch_date), TO_DATE(sales_flat_order.created_at)) as delay 
FROM 
magentodb.sales_flat_order 
LEFT OUTER JOIN erpdb.dispatch 
ON 
sales_flat_order.increment_id == dispatch.order_num 
where
TO_DATE(created_at) >= DATE_SUB(current_date(),6)
AND 
TO_DATE(created_at) <= DATE_SUB(current_date(), 3)
AND
sales_flat_order.status NOT IN ('canceled', 'exchange', 'rto', 'pending_auth', 'pending_payment' ,'partial_refund','refund', 'refund_cash', 'partial_refund_cash', 'holded')
)
AS TempFiltered

现在，我在外部查询中添加了1个额外的WHERE子句，以便它返回＆＃34; less＆＃34;行数，我们称之为column y。

然后我要求将x的百分比取为y（即外部查询返回到子查询的行数）

我不想重复我的子查询只是为了计算行数。我能得到它吗？

这是我到目前为止所得到的：但当然这是错误的。我无法计算所有行，而不必排除选择列或在group by中使用它们。我能解决这个问题吗？

SELECT tempfiltered.delay, count(*) as countOfOrders,(100*count(*))/tempfiltered.Total) over () as percentage
FROM
(
select count(*) as Total, sales_flat_order.increment_id, sales_flat_order.created_at, sales_flat_order.status, dispatch.dispatch_date, 
DATEDIFF(TO_DATE(dispatch.dispatch_date), TO_DATE(sales_flat_order.created_at)) as delay 
FROM 
magentodb.sales_flat_order 
LEFT OUTER JOIN erpdb.dispatch 
ON 
sales_flat_order.increment_id == dispatch.order_num 
where
TO_DATE(created_at) >= DATE_SUB(current_date(),6)
AND 
TO_DATE(created_at) <= DATE_SUB(current_date(), 3)
AND
sales_flat_order.status NOT IN ('canceled', 'exchange', 'rto', 'pending_auth', 'pending_payment' ,'partial_refund','refund', 'refund_cash', 'partial_refund_cash', 'holded')
)
AS TempFiltered
Where 
 DATEDIFF(TO_DATE(TempFiltered.dispatch_date), TO_DATE(TempFiltered.created_at)) > 1     
GROUP BY tempfiltered.delay
ORDER BY tempfiltered.delay

Answer 1

您可以将子查询更改为SELECT INTO查询，并将数据放在临时表中，并在主查询中使用它，并单独选择该临时表的count（*）。这应该非常符合你的要求。

获取子查询返回的行数以及子查询返回的列

1 个答案: