Sqlite聯合和排序順序

Question

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

我可以檢索上面sqlite查詢的輸出，因為'none'應該始終是第一項嗎？，即我想阻止兩種結果集的組合。 請幫忙......

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

我避免在聯合查詢中使用SELECT *

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