mysql order by, null first, and DESC after

问题

How can I order DESC by a field, but list the NULL values first?

So I'm having a table:

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

I want to select them so that the results would be:

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

回答1:

Try this:

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

should work (for mySql)

回答2:

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

来源：https://stackoverflow.com/questions/9307613/mysql-order-by-null-first-and-desc-after