如何在 sqldeveloper 中创建视图

【问题标题】：how can I create a view in sqldeveloper如何在 sqldeveloper 中创建视图
【发布时间】：2022-01-18 16:34:48
【问题描述】：

我正在尝试在视图中添加此查询，在测试时它工作正常且没有语法错误，但当单击保存时，我收到此错误

ORA-00907：缺少右括号

这是查询：

SELECT
    importer_id,
    AVG(count),
    STDDEV(count),
    AVG(count) + STDDEV(count) * 2 AS baseline
FROM
    (SELECT
         COUNT(declaration_identifier)        AS count,
         EXTRACT(MONTH FROM declaration_date) AS month,
         importer_id
     FROM
         declaration
     GROUP BY
         importer_id,
         EXTRACT(MONTH FROM declaration_date)
    )
GROUP BY
    importer_id

【问题讨论】：

标签： sql database oracle

【解决方案1】：

我创建了一个虚拟表来编译您的视图。

create table declaration
( declaration_identifier integer,
  declaration_date date,
  importer_id integer
  );

然后我用 CREATE VIEW 包装了您的查询...

CREATE VIEW SO_ERROR
AS SELECT
    imp_id as id,
    AVG(count) as count,
    STDDEV(count) as stddev,
    AVG(count) + STDDEV(count) * 2 as baseline
FROM
    (
        SELECT
            COUNT(declaration_identifier)         count,
            EXTRACT(MONTH FROM declaration_date)  month,
            importer_id imp_id
        FROM
            declaration
        GROUP BY
            importer_id,
            EXTRACT(MONTH FROM declaration_date) 
    )
GROUP BY
    imp_id;

请注意，外部选择中的每一列都有一个别名。

【讨论】：

感谢帮助，成功了！