mysql、sqlserver的order by按字段內容排序

一、mysql、sqlserver都適用的方法

SELECT username,(CASE WHEN username = '用戶1' THEN 1
    WHEN username = '用戶2' THEN 2
    WHEN username = '用戶3' THEN 3 
    WHEN username = '用戶4' THEN 4
    WHEN username = '用戶5' THEN 5
    WHEN username = '用戶6' THEN 6 ELSE 7 END) orderUsername
FROM sharingcar_info
ORDER BY orderUsername

二、mysql第二種方法

SELECT username
FROM sharingcar_info
ORDER BY username='用戶1' DESC,username='用戶2' DESC,
username='用戶3' DESC,username='用戶4' DESC,
username='用戶5' DESC,username='用戶6' DESC