mysql order by,null first,和DESC之后

Question

如何通过字段订购DESC,但首先列出NULL值？

所以我有一张桌子:

reuestId | offerId | offerTitle
1        | 1       | Alfa
NULL     | 2       | Beta
2        | 3       | Gamma

我想选择它们,以便结果如下:

NULL | 2 | Beta
2    | 3 | Gamma
1    | 1 | Alfa

Answer 1

试试这个:

ORDER BY [reuestId] IS NULL DESC, [reuestId] DESC

应该工作(对于mySql)

Answer 2

SELECT *
FROM TableX
ORDER BY (requestId IS NOT NULL)
       , requestId DESC