Question

此查询按预期工作：

select nspname, relname, max(attnum) as num_cols
from pg_attribute a, pg_namespace n, pg_class c
where n.oid = c.relnamespace and  a.attrelid = c.oid
and c.relname not like '%pkey'
and n.nspname not like 'pg%'
and n.nspname not like 'information%'
group by 1, 2
order by 1, 2;

nspname | relname  | num_cols
--------+----------+----------
public  | category |        4
public  | date     |        8
public  | event    |        6
public  | listing  |        8
public  | sales    |       10
public  | users    |       18
public  | venue    |        5

但是如何获取每个表的列列表？预期产出：

nspname | relname  | num_cols
--------+----------+----------
public  | category | col1, col2, col3, col4
public  | date     | col1, col2, col3, col4 ..., col8

Mysql具有适用于此处的group_concat函数。

http://docs.aws.amazon.com/redshift/latest/dg/c_join_PG_examples.html

该页面上提到的以下查询不会为我返回任何行。

select distinct attrelid, rtrim(name), attname, typname
from pg_attribute a, pg_type t, stv_tbl_perm p
where t.oid=a.atttypid and a.attrelid=p.id
and a.attrelid between 100100 and 110000
and typname not in('oid','xid','tid','cid')
order by a.attrelid asc, typname, attname;

Answer 1

确保在搜索路径中包含您要查看的所有模式。

http://docs.aws.amazon.com/redshift/latest/dg/r_search_path.html

set search_path to '$user', public, enterprise;

没有用户ID搜索路径中的架构的Redshift无法显示列。要访问表结构，您可能还希望对模式具有使用权限。

每个表的列列表

1 个答案: