PostgreSQL - 获取物化视图列元数据 [英] PostgreSQL - get materialized view column metadata

问题描述

这类似于物化视图的列数据类型?但我需要更多数据(不仅仅是数据类型).我想对表/视图执行相同类型的查询，但对实体化视图执行.

This is similar to Column data types for materialized views? but I need more data (not just data type). I would like to have the same kind of query that I do for tables/views but for materialized views.

SELECT column_name, data_type, character_maximum_length,
      character_octet_length, numeric_precision, numeric_precision_radix,
     numeric_scale, datetime_precision, interval_type, interval_precision
     FROM information_schema.columns
    WHERE table_schema = '{}'
    AND table_name   = '{}'
    order by ordinal_position

有人遇到过这种情况吗?pg_attribute 中的列名非常神秘.

Does anyone have something like this? Column names in pg_attribute are very cryptic.

推荐答案

在运行带有 -E ("回显隐藏查询") 选项.

Queries for this kind of question can easily be retrieve when running psql with the -E ("echo hidden queries") option.

以下查询应该可以满足您的要求:

The following query should do what you want:

SELECT a.attname,
       pg_catalog.format_type(a.atttypid, a.atttypmod),
       a.attnotnull
FROM pg_attribute a
  JOIN pg_class t on a.attrelid = t.oid
  JOIN pg_namespace s on t.relnamespace = s.oid
WHERE a.attnum > 0 
  AND NOT a.attisdropped
  AND t.relname = 'mv_name' --<< replace with the name of the MV 
  AND s.nspname = 'public' --<< change to the schema your MV is in 
ORDER BY a.attnum;

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