Question

我有4个选择表Union All作为这些表的connect0r。

Select [] from [a] inner join [b] on a.[] = b.[]
where []

Union All

Select [] from [a] inner join [b] on a.[] = b.[]
where []

Union All

Select [] from [a] inner join [b] on a.[] = b.[]
where []

Union All

Select [] from [a] inner join [b] on a.[] = b.[]
where []

我已经尝试在最后一行或每个order by [a] asc行中制作select，但它仍然不起作用并成为错误。

Answer 1

在第一个select中，您必须拥有别名为A

的列

Select col1 as a [...] from [a] inner join [b] on a.[] = b.[] where []    
Union All   
Select [] from [a] inner join [b] on a.[] = b.[] where []    
Union All    
Select [] from [a] inner join [b] on a.[] = b.[] where []    
Union All    
Select [] from [a] inner join [b] on a.[] = b.[] where []
order by a

Answer 2

您只需将ORDER BY子句放在语句的末尾，引用首先选择列名/别名。

例如

SELECT a,b customName
FROM T1 
WHERE a = 'yourFilter'
UNION ALL
SELECT foo1,foo2 
FROM T2 
WHERE foo2 IN ('otherFilter','otherFilter2')
ORDER BY customName DESC, a

“联合所有”条件下的SQL排序

2 个答案: