Question

我需要查询Redshift元数据以获取表列的列表，其中包含列是否是主键的一部分的信息。

已经有一个帖子List columns with indexes in PostgreSQL有一个PostgreSQL的答案，但不幸的是，它在Redshift上失败了＆＃34; ERROR：42809：op ANY / ALL（数组）需要右侧数组＆＃34 ;

Answer 1

使用以下查询：

select * from pg_table_def where tablename = 'mytablename'

这将为您提供表的所有列及其数据类型，编码以及是否具有排序键或dist键。

Answer 2

以下对我有用：

    SELECT   n.nspname as schema_name,
       t.relname as table_name,
       i.relname as index_name,
       c.contype as index_type,
       a.attname as column_name,
       a.attnum AS column_position
    FROM  pg_class t
    INNER JOIN  pg_index      AS ix ON t.oid = ix.indrelid
    INNER JOIN  pg_constraint AS c  ON ix.indrelid = c.conrelid
    INNER JOIN  pg_class      AS i  ON i.oid = ix.indexrelid
    INNER JOIN  pg_attribute  AS a  ON a.attrelid = t.oid
    AND a.attnum= ANY(string_to_array(textin(int2vectorout(ix.indkey)),' ')::int[])
  INNER JOIN  pg_namespace  AS n  ON n.oid = t.relnamespace;

列出Amazon Redshift中具有索引的列

2 个答案: