存储过程中的LEFT JOIN问题

I've an odd problem:

我有一个奇怪的问题:

SELECT a.uid, b.*, c.liveId FROM a
INNER JOIN b ON (a.uid=b.uid AND a.versionNo=b.versionNo)
LEFT JOIN c ON (a.uid=c.uid)
WHERE a.memberId=1;
SELECT a.ui