粗心了，少打了 select
第一种
SELECT (count() FROM bbs_thread WHERE uid = 7) AS mythreads, (COUNT() FROM bbs_post WHERE uid = 7) AS myposts
第二种
SELECT (count() FROM bbs_thread WHERE uid = 7) AS mythreads, COUNT() AS myposts FROM bbs_post WHERE uid = 7
以上两种写法均不可行。
补充一下，是在 mysql 5.7.9 下
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SELECT (select count() FROM bbs_thread WHERE uid = 7) AS mythreads, (select COUNT() FROM bbs_post WHERE uid = 7) AS myposts
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