postgresql知識點：查看錶的字段名、字段描述等

select A.relname as 表名, B.attname AS 字段名, B.attnum as 字段排序, format_type (B.atttypid,B.atttypmod ) AS 數據類型及長度, B.attnotnull AS 非空, col_description ( B.attrelid, B.attnum ) AS 字段描述 from pg_class

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