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查询所有手术预约及相对应的安排，如果安排的pk不为null，则用逗号隔开（如果有多个）。mysql中sql语句如下：
select distinct a.pk, a.surgeryName, a.clerkName, a.customerName, a.orderTime, b.forecastTime, b.pk surgery_pk,
case
when c.pk is not null then (select group_concat(d.pk) from surgery_arrange d where d.surgery_order_fk=a.pk)
else null end surgery_arrange_pk
from (surgery_order a left join surgery b on a.surgery_fk=b.pk) left join surgery_arrange c on a.pk=c.surgery_order_fk
order by surgery_arrange_pk desc, a.orderTime asc
limit 0,10
结果如下图所示：
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