Sql 我想要每个datesection的最大容量，但当我运行它时

导致此错误的原因：

[Err]错误：表“steponesection”的子句条目中缺少
第10行：其中“公共”。steponesection。“交易量”=最大值
^

错误信息非常清楚：

where

子句不能引用

steponesesection

，因为在该查询级别上没有具有该名称的标识符。派生表称为

t

，这就是您需要使用的

您也没有在内部查询中选择

“交易量”

，因此它在外部级别不可用：

SELECT *
FROM
(SELECT
"public".steponesection.datesection,
"public".steponesection."Trade Price",
max ("public".steponesection."Trade Volume") OVER (partition by "public".steponesection.datesection) as max_Volm

FROM "public".steponesection)t

WHERE "public".steponesection."Trade Volume" = max_Volm

选择*
从(
选择“public”.steponesesection.datesection，
“公共”。StephoneSection.“交易价格”，
“公共”。StephoneSection.“交易量”--
SELECT *
FROM (
   SELECT "public".steponesection.datesection,
          "public".steponesection."Trade Price",
          "public".steponesection."Trade Volume",  --<< missing
           max ("public".steponesection."Trade Volume") OVER (partition by "public".steponesection.datesection) as max_volm
   FROM "public".steponesection
) t
WHERE t."Trade Volume" = t.max_volm --<< use the alias of the derived table