GP中查詢表和視圖清單，視圖的字段及其類型

查詢schema_name.view_name的字段及其類型：sql select a.attname, pg_catalog.format_type(a.atttypid, a.atttypmod) as type,a.attnotnull from pg_catalog.pg_attribute a,pg_catalog.pg_class c, pg_catalog.pg_namespace

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