PostgreSQL中物化视图的列名和数据类型？
PostgreSQL中物化视图的列名和数据类型？
提问于 2015-06-29 15:10:32
对于一般表和视图，我可以通过运行以下查询查看它们的数据类型：
select data_type from information_schema.columns
where .....但是，这里似乎没有显示任何有关物化视图的信息。
通过运行以下命令，我能够获得物化视图的列列表：
SELECT
a.attname as column_name
FROM
pg_catalog.pg_attribute a
INNER JOIN
(SELECT c.oid,
n.nspname,
c.relname
FROM pg_catalog.pg_class c
LEFT JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace
WHERE c.relname ~ ('^(materializedview)$')
AND pg_catalog.pg_table_is_visible(c.oid)
ORDER BY 2, 3) b
ON a.attrelid = b.oid
INNER JOIN
(SELECT
a.attrelid,
max(a.attnum) as max_attnum
FROM pg_catalog.pg_attribute a
WHERE a.attnum > 0
AND NOT a.attisdropped
GROUP BY a.attrelid) e
ON a.attrelid=e.attrelid
WHERE a.attnum > 0
AND NOT a.attisdropped
ORDER BY a.attnum但是，我无法确定是否能够确定底层列/数据类型。
有办法查看这些信息吗？
回答 1
Stack Overflow用户
回答已采纳
发布于 2015-10-11 12:14:09
我觉得你们很亲密。最后一步是加入pg_type
join pg_catalog.pg_type as tp on tp.oid = attr.atttypid字段tp.typname将具有数据类型。
以下查询使用命名空间(例如，模式)和关系(例如物化视图)名称获取列数据类型：
select
attr.attnum,
ns.nspname as schema_name,
cls.relname as table_name,
attr.attname as column_name,
tp.typname as datatype
from pg_catalog.pg_attribute as attr
join pg_catalog.pg_class as cls on cls.oid = attr.attrelid
join pg_catalog.pg_namespace as ns on ns.oid = cls.relnamespace
join pg_catalog.pg_type as tp on tp.oid = attr.atttypid
where
ns.nspname = 'your_schema'
and cls.relname = 'your_materialized_view'
and attr.attnum >= 1
order by
attr.attnum你必须改变'your_schema'和'your_materialized_view'。
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原文链接：
https://stackoverflow.com/questions/31119260
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