在 postgres sql 中创建带有评论的视图

Question

我在 postgres sql 中使用 sql 语句创建了一个视图

CREATE OR REPLACE VIEW  {ViewName} as 
Select
.....

我想问有没有什么方法可以为视图中的列创建注释。创建视图后，在向列添加注释时会生成错误：

ERROR: "{ViewName}" is not a table, composite type, or foreign table.

Answer 1

要在列（或视图）上定义注释，请使用 comment on:

create view some_view
as
select x as col1, y as col2, z as col3
from some_table;

然后：

comment on view some_view is 'Some View';
comment on column some_view.col1 is 'Originally column X';

Answer 2

使用虚拟 select 语句。

select 'general information for the use of the comments' as c1;

它很笨重，但这是我能找到的唯一嵌入评论的方法。对于较大的项目，我在 header.

中创建评论

with query_header as (
    select 'purpose - statement' as c1,
    select 'revision - revised 16 Oct 2019 by WDH' as c2
    select 'owner - contact details' as c3
    select 'lines 234-312 to declutter orders with no valid partnmber' as c4
    select 'join on itemtable changed to left join 23July2018 by WDH' as c5
)

在 postgres sql 中创建带有评论的视图

Create view in postgres sql with comments

sql

postgresql

sql-view