sql - 显示驱动程序和所涉及的班次数超过 1

Question

select dr_drvname, count(sh_drvnum)
from driver join shift on dr_drvnum = sh_drvnum
where count(sh_drvnum) not like '1'
group by dr_drvname;

此代码不起作用。我知道某处需要涉及子查询，但我无法弄清楚什么和在哪里。谢谢。

Answer 1

got it solved here's the answer

select dr_drvname, count(sh_drvnum)
from driver join shift on dr_drvnum = sh_drvnum
group by dr_drvname
having count(sh_drvnum) > 1;

Answer 2

或者，在加入之前预先聚合计数：

select dr_drvname,
       shift_count
from   driver inner join (
         select   sh_drvnum,
                  count(*) shift_count
         from     shift
         group by sh_drvnum
         having   count(*) > 1) on (dr_drvname = sh_drvname)