错误 SQL 查询:使用 SUM 方法，当 #1054 - 'where 子句'中的未知列'tbl_customers.id' [英] Error SQL query: Use SUM method, When #1054 - Unknown column 'tbl_customers.id' in 'where clause'

问题描述

当我们表客户 id 时出现错误#1054 - 'where 子句'中的未知列'tbl_customers.id'其实问题是每个派生表都必须有自己的别名.

When us table customer id than getting error #1054 - Unknown column 'tbl_customers.id' in 'where clause' Actually problems is Every derived table must have its own alias.

喜欢下面的这个查询.

SELECT tbl_customers.*,(SELECT SUM(amount) As Amount
FROM 
(
    SELECT tcc.entry_fees*COUNT(tccc.match_contest_id) as amount 
    FROM `tbl_cricket_customer_contests` tccc 
    LEFT JOIN tbl_cricket_contest_matches tccm on(tccm.id=tccc.match_contest_id) 
    LEFT JOIN tbl_cricket_contests tcc ON (tcc.id=tccm.contest_id) 
    WHERE tccc.customer_id = tbl_customers.id GROUP BY tccc.match_contest_id
) As DT) as spendamount
FROM (`tbl_customers`) 
WHERE `tbl_customers`.`is_deleted` = 'N' 
GROUP BY `tbl_customers`.`id` 
ORDER BY `spendamount` DESC

在查询中遵循此表关系结构.

Below table relationship structure following this in query.

推荐答案

如果我想要总量，不要嵌套聚合函数并删除分组:

If I want the total amount, don't nest the aggregation functions and remove the group by:

SELECT tbl_customers.*,(SELECT SUM(tcc.entry_fees) as amount 
                        FROM tbl_cricket_customer_contests tccc 
                        JOIN tbl_cricket_contest_matches tccm ON tccm.id = tccc.match_contest_id 
                        JOIN tbl_cricket_contests tcc ON tcc.id = tccm.contest_id 
                        WHERE tccc.customer_id = tbl_customers.id ) as spendamount
FROM (`tbl_customers`) 
WHERE `tbl_customers`.`is_deleted` = 'N' 
GROUP BY `tbl_customers`.`id` 
ORDER BY `spendamount` DESC

我还将 LEFT JOIN 更改为 JOIN.您正在对最后一个表中的值求和，因此只有匹配的行才对总和有贡献.

I also changed the LEFT JOIN to JOIN. You are summing values from the last table, so only matching rows contribute to the sum.

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