mysql错误：以前找到了别名

Question

我在mysql查询中使用这些代码

    select c1.date,sum(SELECT IFNULL(cx.purchase-cx.sold,0))+MAX(p.openqty) as opening,c1.purchase,c1.sold,
    sum(SELECT IFNULL(cx.purchase-cx.sold,0))+MAX(p.openqty) + c1.purchase-c1.sold as closing 
from 
    (select open_qty as openqty from stock ) p
left join
(select IFNULL(a.date,b.date) as date,SELECT IFNULL(a.qty,0) as purchase,SELECT IFNULL(b.qty,0) as sold from arrival a FULL JOIN pouring b ON a.date = b.date order by 1) c1 
on c1.purchase +p.openqty>0
left join
 (select IFNULL(a.date,b.date) as date,SELECT IFNULL(a.qty,0) as purchase,SELECT IFNULL(b.qty,0) as sold from arrival a FULL JOIN pouring b ON a.date = b.date order by 1) cx 
on c1.date>cx.date
 group by c1.date,c1.purchase,c1.sold

它说：

An alias was previously found. (near "purchase" at position 170)
An alias was previously found. (near "c1" at position 179)
An alias was previously found. (near "sold" at position 182)
An alias was previously found. (near "closing" at position 190)

MySQL说：文档

  

1064 - 您的SQL语法出错;检查与MySQL服务器版本对应的手册，以获得正确的语法

     靠近'SELECT IFNULL（cx.purchase-cx.sold，0））+ MAX（p.openqty）as   开放，c1.purchase，C1“。在第1行

请帮助如何克服？

2 个答案:

答案 0 :(得分：0)

首先，子查询需要有自己的括号。其次，子查询不能是聚合函数的参数。第三，你根本不需要子查询。所以：

select c1.date,
       (COALESCE(sum(cx.purchase-cx.sold), 0) + MAX(p.openqty)
       ) as opening, c1.purchase, c1.sold,
       (COALESCE(sum(cx.purchase-cx.sold), 0) + MAX(p.openqty) + c1.purchase - c1.sold
       ) as closing 

答案 1 :(得分：0)

一种可能性

select c1.date,sum(coalesce(cx.purchase-cx.sold,0))+MAX(p.openqty)  as opening,
c1.purchase,
c1.sold,
sum(coalesce(cx.purchase-cx.sold,0)) + MAX(p.openqty) + c1.purchase-c1.sold as closing 
from ( select open_qty as openqty from stock ) p
left join ( select coalesce(a.date,b.date) as date,
            coalesce(a.qty,0) as purchase,
            coalesce(b.qty,0) as sold 
            from arrival a 
            LEFT JOIN pouring b ON a.date = b.date 
            UNION select coalesce(a.date,b.date) as date,
            coalesce(a.qty,0) as purchase,
            coalesce(b.qty,0) as sold 
            from arrival a 
            RIGHT JOIN pouring b ON a.date = b.date 
            order by 1) c1 on c1.purchase +p.openqty>0
left join ( select coalesce(a.date,b.date) as date,
            coalesce(a.qty,0) as purchase,
            coalesce(b.qty,0) as sold 
            from arrival a 
            LEFT JOIN pouring b ON a.date = b.date 
            UNION select coalesce(a.date,b.date) as date,
            coalesce(a.qty,0) as purchase,
            coalesce(b.qty,0) as sold 
            from arrival a 
            RIGHT JOIN pouring b ON a.date = b.date order by 1) cx on c1.date>cx.date
group by c1.date,c1.purchase,c1.sold 
order by 1

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Answer 1

首先，子查询需要有自己的括号。其次，子查询不能是聚合函数的参数。第三，你根本不需要子查询。所以：

select c1.date,
       (COALESCE(sum(cx.purchase-cx.sold), 0) + MAX(p.openqty)
       ) as opening, c1.purchase, c1.sold,
       (COALESCE(sum(cx.purchase-cx.sold), 0) + MAX(p.openqty) + c1.purchase - c1.sold
       ) as closing 

Answer 2

一种可能性

select c1.date,sum(coalesce(cx.purchase-cx.sold,0))+MAX(p.openqty)  as opening,
c1.purchase,
c1.sold,
sum(coalesce(cx.purchase-cx.sold,0)) + MAX(p.openqty) + c1.purchase-c1.sold as closing 
from ( select open_qty as openqty from stock ) p
left join ( select coalesce(a.date,b.date) as date,
            coalesce(a.qty,0) as purchase,
            coalesce(b.qty,0) as sold 
            from arrival a 
            LEFT JOIN pouring b ON a.date = b.date 
            UNION select coalesce(a.date,b.date) as date,
            coalesce(a.qty,0) as purchase,
            coalesce(b.qty,0) as sold 
            from arrival a 
            RIGHT JOIN pouring b ON a.date = b.date 
            order by 1) c1 on c1.purchase +p.openqty>0
left join ( select coalesce(a.date,b.date) as date,
            coalesce(a.qty,0) as purchase,
            coalesce(b.qty,0) as sold 
            from arrival a 
            LEFT JOIN pouring b ON a.date = b.date 
            UNION select coalesce(a.date,b.date) as date,
            coalesce(a.qty,0) as purchase,
            coalesce(b.qty,0) as sold 
            from arrival a 
            RIGHT JOIN pouring b ON a.date = b.date order by 1) cx on c1.date>cx.date
group by c1.date,c1.purchase,c1.sold 
order by 1