postgresql - Postgres 改变 View 添加列

Question

我想改变一个 View 并在其中添加一个新列。我有:

ALTER VIEW folders_contents
AS
SELECT files.id,
    files.name,
    files.filesize,
    files.updated,
    files.deleted,
   FROM files
UNION ALL
 SELECT folders.id,
    folders.name,
    0 AS filesize,
    folders.updated,
    folders.deleted,
    FROM folders
  ORDER BY 8, 2
GO

问题在于它显示:

[Err] ERROR: syntax error at or near "AS"

我是第一次处理 View ，我需要一些帮助:)

Answer 1

ALTER VIEW changes various auxiliary properties of a view. 
(If you want to modify the view's defining query, use CREATE OR REPLACE VIEW.)

使用创建或替换代替

在您的情况下，它将类似于:

CREATE OR REPLACE VIEW folders_contents
AS
SELECT files.id,
    files.name,
    files.filesize,
    files.updated,
    files.deleted,
   FROM files
UNION ALL
 SELECT folders.id,
    folders.name,
    0 AS filesize,
    folders.updated,
    folders.deleted,
    FROM folders
  ORDER BY 8, 2;

SOURCE