每个派生 table 必须有自己的别名？这怎么错了

Question

我已经给派生的 table 一个别名，但是当我运行查询时它仍然给我错误 "Every derived table must have its own alias".

select a,b,c,sum(d) as 'sum'
from(select a,b,c,sum(d)as 'd' from e join f using(z)) as 'alias'
group by a;


EDIT: better sample
----This gives derived table error-----
select name,sum(pop) as 'total' from(select name as 'name',sum(population) 
as pop from table1 join table2 using(countrycode));

----This gives me the SQL syntax error--------
select name,sum(pop) as 'total' from(select name as 'name',sum(population) 
as pop from table1 join table2 using(countrycode)) as 'alias';

提前致谢。

Answer 1

试试这个：

select name,
       sum(pop) as `total` 
from( 
        select name as `name`, sum(population) as pop 
        from table1 
        join table2 using(countrycode)
) `m` <---- alias needed here too

每个派生 table 必须有自己的别名？这怎么错了

Every derived table must have its own alias? How is this wrong

mysql

mysql-error-1064