结果列表顶部的指定记录

Question

任务：在结果列表顶部选择指定记录

我丑陋的变种：

(select * from mytable where id = 42)
union all
(select * from mytable where id != 42 order by id)

除ansi mysql以外，{{1}}的查询变体对我来说也很有趣

Answer 1

ANSI和供应商SQL解决方案之间没有区别

select *
from mytable 
order by
    CASE WHEN id = 42 THEN 0 ELSE 1 END, id

注意：对于没有ORDER BY子句的表或SELECT，有否保证或隐含的顺序

Answer 2

假设id始终为正，请尝试：

select *
from mytable 
order by CASE WHEN id = 42 THEN 0 ELSE id END