Yii怎么表示 sort = 0,sort desc; [ 未指定版本 ]

SELECT FROM banner ORDER BY CASE when sort<>0 then sort else 99999 end asc;
SELECT FROM banner ORDER BY CASE when sort<>0 then sort else 99999 end desc;

SELECT FROM banner ORDER BY sort = 0,sort asc;
SELECT FROM banner ORDER BY sort = 0,sort desc;

Yii怎么表示ORDER BY啊

->orderBy('paixu=0 Paixu desc')

打印出来的是
ORDER BY ‘paixu=0 Paixu’ DESC