获取错误错误：WHERE位置：98中不允许聚合函数

Question

我试图找到customer值的minimum我试过这样

select info->'customer'
from orders
where cast(info->'items'->>'qty' as INTEGER) =
      (select min(cast(info->'items'->>'qty' as INTEGER)))

这是我的代码

http://sqlfiddle.com/#!17/79606/17

获取错误：WHERE位置：98中不允许聚合函数

预期答案“Josh William”

Answer 1

你的子查询错过了FROM条款。尝试：

select info->'customer'
from orders
where cast(info->'items'->>'qty' as INTEGER) =
      (select min(cast(info->'items'->>'qty' as INTEGER))
              from orders)