postgresql数据库如何查看数据中表的信息

select * from pg_namespace WHERE nspname ='screen';

select * from pg_tables  where schemaname = 'creen' and tablename = 'title';

select * from pg_class where relname = 'title' ;

select * from pg_description
where objoid = to_regclass('screen' || '.' || 'title')::REGCLASS::OID;

SELECT tb.table_name, d.description
FROM information_schema.tables tb
       JOIN pg_class c ON c.relname = tb.table_name
       LEFT JOIN pg_description d ON d.objoid = c.oid AND d.objsubid = '0'
WHERE tb.table_schema = 'screen';

-- 查询列注释
SELECT col.table_catalog,
       col.table_schema   AS tableSchema,
       col.table_name     AS tableName,
       col.column_name    AS fieldName,
       col.is_nullable    AS "isNull",
       col.data_type      AS dataType,
       col.column_default AS defaultValue,
       d.description      AS fieldDescribe
FROM information_schema.columns col
         JOIN pg_class c ON c.relname = col.table_name
         LEFT JOIN pg_description d ON d.objoid = c.oid
    AND d.objsubid = col.ordinal_position
WHERE col.table_schema = 'screen'
ORDER BY col.table_name;