Обсуждение: Notes or comments on columns in a table
PostgreSQL 9.2
When creating a table or altering a column of a table, is there a way to add notes on a column?
If not:
I have a new enhancement request. When creating a table or altering a column, it would be nice if a user could add “comments” or “notes” to a column. This note would only appear when doing “\d table_name”.
Why? I was adding a new column to a table called “type”. Normally I only add types as characters even though integers are much better for indexing. The problem with integers is I never remember what value means what. Does a 1 mean directory or file. So I end up creating “type” as a character so I can do a quick SELECT DISTINCT to figure out the options. I would use integers if I could do \d table_name to see in the notes section what values meant. I would think other people run into this issue all the time.
Thanks,
Lance Campbell
Software Architect
Web Services at Public Affairs
217-333-0382
Вложения
PostgreSQL 9.2
When creating a table or altering a column of a table, is there a way to add notes on a column?
If not:
I have a new enhancement request. When creating a table or altering a column, it would be nice if a user could add “comments” or “notes” to a column. This note would only appear when doing “\d table_name”.
Why? I was adding a new column to a table called “type”. Normally I only add types as characters even though integers are much better for indexing. The problem with integers is I never remember what value means what. Does a 1 mean directory or file. So I end up creating “type” as a character so I can do a quick SELECT DISTINCT to figure out the options. I would use integers if I could do \d table_name to see in the notes section what values meant. I would think other people run into this issue all the time.
You should use an enumerated type definition.
create type my_file_type (
'File',
'Directory',
'SymLink')
create table foo (
id integer primary key,
filetype my_file_type
)
insert into foo(1, 'File');
select * from foo;
1 File
... and so forth.
Craig
Thanks,
Lance Campbell
Software Architect
Web Services at Public Affairs
217-333-0382
