Question

我有一个显示公司列表的select语句。

SELECT distinct [Company]
  FROM [Records]

如何添加条目＆＃34; ALL＆＃34;作为返回列表中的第一项？

Answer 1

使用union all和order by：

select company
from ((select distinct company, 1 as ordering from records)
      union all
      (select 'ALL', 0)
     ) t
order by ordering;

在实践中，以下似乎有效：

select 'ALL' as company
union all
select distinct company from records;

但是，SQL Server不保证按顺序执行这些操作。在实践中，我从未发现过这样的陈述不会将ALL放在第一位的情况，但据我所知，这并不能保证。

Answer 2

您可以使用UNION ALL并添加订单：

SELECT [Company] FROM
    (SELECT 'All' as [Company], 0 as RecordOrder
    UNION ALL
    SELECT distinct [Company], 1 as RecordOrder
    FROM [Records]) X
ORDER BY RecordOrder

Answer 3

尝试使用union all

    SELECT 'ALL'
    UNION ALL
    SELECT distinct [Company]
      FROM [Records]

Answer 4

SELECT 'ALL'
UNION ALL
SELECT distinct [Company]
FROM [Records]

SQL将ALL添加到select语句

4 个答案: