我从SQL查询中返回了以下几行,有人可以提供通用的排序代码来按升序对值进行排序吗?
('High_Speed'),
('M1 Speed'),
('M13 Speed'),
('M14 Speed'),
('M2 Speed'),
('M3 Speed'),
('Medium_Speed'),
('Test1 zone1 High_Speed'),
('Test1 zone11 High_Speed'),
('Test1 zone2 High_Speed'),
('Test1 zone21 High_Speed'),
('Medium_Speed'),
('Zone206 Speed')
期望排序-
('High_Speed'),
('M1 Speed'),
('M2 Speed'),
('M3 Speed'),
('M13 Speed'),
('M14 Speed'),
('Medium_Speed'),
('Test1 zone1 High_Speed'),
('Test1 zone2 High_Speed'),
('Test1 zone11 High_Speed'),
('Test1 zone21 High_Speed'),
('Medium_Speed'),
('Zone206 Speed')
最通用的方法是使用case
表达式:
order by (case col
when 'High_Speed' then 1
when 'M1 Speed' then 2
when 'M2 Speed' then 3
when 'M3 Speed' then 4
when 'M13 Speed' then 5
when 'M14 Speed' then 6
when 'Medium_Speed' then 7
when 'Test1 zone1 High_Speed' then 8
when 'Test1 zone2 High_Speed' then 9
when 'Test1 zone11 High_Speed' then 10
when 'Test1 zone21 High_Speed' then 11
when 'Medium_Speed' then 12
when 'Zone206 Speed' then 13
else 999
end)