显示表，描述与redshift等价的表

我是AWS的新手，有人可以告诉我redshifts与mysql命令等效吗？

show tables -- redshift command
describe table_name -- redshift command

所有信息都可以在PG_TABLE_DEF表格文档中找到。

列出public模式中的所有表（默认）-show tables等效：

SELECT DISTINCT tablename
FROM pg_table_def
WHERE schemaname = 'public'
ORDER BY tablename;

名为table_name的表中所有列的描述-describe table等效：

SELECT *
FROM pg_table_def
WHERE tablename = 'table_name'
AND schemaname = 'public';

我必须从信息模式中进行选择以获取表和列的详细信息。如果它可以帮助任何人：

SELECT * FROM information_schema.tables
WHERE table_schema = 'myschema'; 

SELECT * FROM information_schema.columns
WHERE table_schema = 'myschema' AND table_name = 'mytable'; 

或者简单地：

\dt 显示表格

\d+ <table name> 描述一张桌子

编辑：使用psql命令行客户端工作

Tomasz Tybulewicz的答案是个好方法。

SELECT * FROM pg_table_def WHERE tablename = 'YOUR_TABLE_NAME' AND schemaname = 'YOUR_SCHEMA_NAME';

如果在搜索路径中未定义架构名称，则该查询将显示空结果。请首先通过以下代码检查搜索路径。

SHOW SEARCH_PATH

如果在搜索路径中未定义架构名称，则可以重置搜索路径。

SET SEARCH_PATH to '$user', public, YOUR_SCEHMA_NAME

您可以使用-desc /在Redshift中查看视图/表的定义。我一直在使用Workbench / J作为Redshift的SQL客户端，它在Results选项卡旁边的Messages选项卡中提供了定义。

在下面的文章中，我记录了从Redshift检索TABLE和COLUMN注释的查询。 https://sqlsylvia.wordpress.com/2017/04/29/redshift-comment-views-documenting-data/

请享用！

表注释

    SELECT n.nspname AS schema_name
     , pg_get_userbyid(c.relowner) AS table_owner
     , c.relname AS table_name
     , CASE WHEN c.relkind = 'v' THEN 'view' ELSE 'table' END 
       AS table_type
     , d.description AS table_description
     FROM pg_class As c
     LEFT JOIN pg_namespace n ON n.oid = c.relnamespace
     LEFT JOIN pg_tablespace t ON t.oid = c.reltablespace
     LEFT JOIN pg_description As d 
          ON (d.objoid = c.oid AND d.objsubid = 0)
     WHERE c.relkind IN('r', 'v') AND d.description > ''
     ORDER BY n.nspname, c.relname ;

专栏评论

    SELECT n.nspname AS schema_name
     , pg_get_userbyid(c.relowner) AS table_owner
     , c.relname AS table_name
     , a.attname AS column_name
     , d.description AS column_description
    FROM pg_class AS c
    INNER JOIN pg_attribute As a ON c.oid = a.attrelid
    INNER JOIN pg_namespace n ON n.oid = c.relnamespace
    LEFT JOIN pg_tablespace t ON t.oid = c.reltablespace
    LEFT JOIN pg_description As d 
     ON (d.objoid = c.oid AND d.objsubid = a.attnum)
    WHERE c.relkind IN('r', 'v')
     AND a.attname NOT         
     IN ('cmax', 'oid', 'cmin', 'deletexid', 'ctid', 'tableoid','xmax', 'xmin', 'insertxid')
    ORDER BY n.nspname, c.relname, a.attname;

捷径

\ d用于显示所有表格

\ d表名描述表

\？有关Redshift的更多快捷方式

您可以简单地使用下面的命令来描述一个表。

desc table-name

要么

desc schema-name.table-name