0
在工作台上打开一个新的会话并尝试运行此查询此查询在第一次执行时返回计数'15' ,第二次执行时返回'4'为什么它如此..Mysql查询给出不同的计数第一次和第二次执行
select count(id)
from (
select *,@num := if(@company_id = company_id, @num + 1, 1) as row_number,@company_id := company_id as dummy
from salebuild_ctl.company_contact
where id in (12352,59898,59899,59900,59901,59902,59903,59904,14047,15196,15197,41402,41403,41404,41405)
order by company_id, date_created asc
) as x
where x.row_number <= 2;
什么IST的'选择@num结果之前正常运行;您查询的每个调用之前'? – Lars 2013-03-01 06:21:36