查詢當前用戶所有表明及表結構，用and t1.TABLE_NAME='你要查詢的表名' 這個表來查出單獨表結構。

SELECT --t1.Table_Name || chr(13) || t3.comments AS "表名稱及說明",t1.Column_Name AS "字段名稱",t1.DATA_TYPE AS "數據類型",t1.DATA_LENGTH AS "長度",t1.NullAble AS "是否為空",t2.Comments AS "字段說明",t1.Data_Default AS "默認值"--t4.created AS "建表時間"--t3.comments AS "表說明",FROM cols t1LEFT JOIN user_col_comments t2 ON t1.Table_name = t2.Table_nameAND t1.Column_Name = t2.Column_NameLEFT JOIN user_tab_comments t3 ON t1.Table_name = t3.Table_nameLEFT JOIN user_objects t4 ON t1.table_name = t4.OBJECT_NAMEWHERE NOT EXISTS (SELECT t4.Object_NameFROM User_objects t4WHERE t4.Object_Type = 'TABLE'AND t4.Temporary = 'Y'AND t4.Object_Name = t1.Table_Name)--and t1.TABLE_NAME='你要查詢的表名'ORDER BY t1.Table_Name, t1.Column_ID;

?查詢當前表中所有表名稱及結構

select distinct t.table_name,t.comments from user_col_comments t order by t.table_name

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