Sqlite联合和排序顺序

Question

select 'none', '0'
union
select * from category where id='2'

我可以检索上面sqlite查询的输出，因为'none'应该始终是第一项吗？，即我想阻止两种结果集的组合排序。请帮忙......

Answer 1

select * from
(
select 'none' as col1, '0' as col2 union  select  * from category where id='2' 
) t
order by case when col1='none' then 0 else 1 end

Answer 2

我会避免在联合查询中使用SELECT *

SELECT 'none', '0', 0 AS sort
UNION
SELECT col1, col2, 1 AS sort
FROM category
WHERE id = '2'
ORDER BY sort ASC