十三、Oracle 系统表

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一、SYS 系统表

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1. 用户

-- 当前用户名
SELECT USER AS "用户名"
FROM SYS.DUAL;

-- 当前用户ID
SELECT USERENV('SCHEMAID') AS "用名ID" 
FROM SYS.DUAL;

-- 当前用户
SELECT USERNAME             AS "用户名"
     , USER_ID              AS "用户ID"
     , DEFAULT_TABLESPACE   AS "默认表空间"
     , TEMPORARY_TABLESPACE AS "临时表空间"
     , t.*
FROM SYS.USER_USERS t;
-- `SYS.DBA_USERS`DBA
-- `SYS.ALL_USERS`所有

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2. 表空间

-- 当前用户，表空间
SELECT TABLESPACE_NAME AS "表空间名", t.*
FROM SYS.USER_TABLESPACES t;

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3. 数据表

• 所有表 + 物化视图。

-- 当前用户，所有表 + 物化视图
SELECT TABLE_NAME AS "表名", TABLESPACE_NAME AS "表空间名", t.*
FROM SYS.USER_TABLES t;

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• 所有表 + 物化视图。

-- 当前用户，所有表 + 物化视图
SELECT TABLE_NAME AS "表名", TABLESPACE_NAME AS "表空间名", t.*
FROM SYS.USER_ALL_TABLES t;

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• 所有表 + 视图的注释。

-- 当前用户，所有表 + 视图的注释
SELECT TABLE_NAME AS "表名", TABLE_TYPE AS "表类型[TABLE|VIEW]", COMMENTS AS "注释", t.*
FROM SYS.USER_TAB_COMMENTS t;

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4. 数据列

-- 当前用户，所有表 + 视图 + 物化视图的列。
SELECT TABLE_NAME   AS "表名"
     , COLUMN_NAME  AS "列名"
     , DATA_TYPE    AS "数据类型"
     , DATA_LENGTH  AS "数据长度"
     , NULLABLE     AS "可以为空[N|Y]"
     , DATA_DEFAULT AS "默认数据"
     , COLUMN_ID    AS "行号"
     , t.*
FROM SYS.USER_TAB_COLUMNS t
ORDER BY TABLE_NAME, COLUMN_ID;

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• 所有表 + 视图 + 物化视图的注释。

-- 当前用户，所有表 + 视图 + 物化视图的注释。
SELECT TABLE_NAME  AS "表名"
     , COLUMN_NAME AS "列名"
     , COMMENTS    AS "注释"
     , t.*
FROM SYS.USER_COL_COMMENTS t;

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5. 约束

• 所有表的约束列。

-- 当前用户，所有表的约束列。
SELECT OWNER           AS "所属用户"
     , CONSTRAINT_NAME AS "约束名"
     , TABLE_NAME      AS "表名"
     , COLUMN_NAME     AS "列名"
     , POSITION        AS "位置"
     , t.*
FROM SYS.USER_CONS_COLUMNS t
WHERE OWNER = 'QS';

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• 所有表 + 视图的约束。

-- 当前用户，所有表 + 视图的约束。
SELECT OWNER            AS "所属用户"
     , CONSTRAINT_NAME  AS "约束名"
     , CONSTRAINT_TYPE  AS "约束类型[P主键|R外键|V|C]"
     , TABLE_NAME       AS "表名"
     , SEARCH_CONDITION AS "搜索条件"
     , INDEX_OWNER      AS "所属用户"
     , R_OWNER          AS "外键所属用户"
     , INDEX_NAME       AS "索引名"
     , t.*
FROM SYS.USER_CONSTRAINTS t
WHERE OWNER = 'QS';

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6. 索引

• 所有索引。

-- 当前用户，所有索引。
SELECT INDEX_NAME      AS "索引名"
     , INDEX_TYPE      AS "索引类型[NORMAL|UNIQUE|BITMAP]"
     , TABLE_OWNER     AS "表的主人"
     , TABLE_NAME      AS "表名"
     , TABLE_TYPE      AS "表类型[TABLE]"
     , UNIQUENESS      AS "唯一的[UNIQUE|NONUNIQUE]"
     , TABLESPACE_NAME AS "表空间名"
     , t.*
FROM SYS.USER_INDEXES t;

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• 所有索引列。

-- 当前用户，所有索引列。
SELECT INDEX_NAME      AS "索引名"
     , TABLE_NAME      AS "表名"
     , COLUMN_NAME     AS "列名"
     , COLUMN_POSITION AS "列的位置"
     , COLUMN_LENGTH   AS "列的长度"
     , DESCEND         AS "排序[ASC|DESC]"
     , t.*
FROM SYS.USER_IND_COLUMNS t;

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7. 视图

• 所有视图。

-- 当前用户，所有视图
SELECT VIEW_NAME AS "视图名", t.*
FROM SYS.USER_VIEWS t;

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8. 物化视图

• 所有物化视图。

-- 当前用户，所有物化视图
SELECT OWNER AS "所属用户", MVIEW_NAME AS "物化视图名", t.*
FROM SYS.USER_MVIEWS t
WHERE OWNER = 'QS';

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9. 存储过程 + 存储函数

-- 当前用户，所有存储过程 + 存储函数。
SELECT OBJECT_NAME    AS "对象名[过程名|方法名]"
     , PROCEDURE_NAME AS "过程名"
     , OBJECT_TYPE    AS "对象类型[PROCEDURE|FUNCTION]"
     , t.*
FROM SYS.USER_PROCEDURES t
WHERE OBJECT_TYPE IN ('PROCEDURE', 'FUNCTION');

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-- 当前用户，所有存储过程 + 存储函数配置。
SELECT OBJECT_NAME AS "对象名[过程名|方法名]"
     , PARAM_VALUE AS "参数值"
     , OBJECT_NAME AS "对象名[存储函数]"
     , t.*
FROM SYS.USER_STORED_SETTINGS t;

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7. 触发器

• 所有触发器。

-- 当前用户，所有触发器。
SELECT TRIGGER_NAME     AS "触发器名"
     , TRIGGER_TYPE     AS "触发类型"
     , TRIGGERING_EVENT AS "触发事件"
     , TABLE_OWNER      AS "表的主人"
     , BASE_OBJECT_TYPE AS "基本对象类型"
     , TABLE_NAME       AS "表名"
     , COLUMN_NAME      AS "列名"
     , t.*
FROM SYS.USER_TRIGGERS t;

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• 所有触发器列。

-- 当前用户，所有触发器列。
SELECT TRIGGER_OWNER AS "所属用户"
     , TRIGGER_NAME  AS "触发器名"
     , TABLE_OWNER   AS "表的主人"
     , TABLE_NAME    AS "表名"
     , COLUMN_NAME   AS "列名"
     , COLUMN_LIST   AS "列清单"
     , COLUMN_USAGE  AS "列的使用"
     , t.*
FROM SYS.USER_TRIGGER_COLS t
WHERE TABLE_OWNER = 'QS';

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• 所有触发器命令。

-- 当前用户，所有触发器命令。
SELECT TRIGGER_NAME  AS "触发器名"
     , REFERENCED_TRIGGER_OWNER
     , REFERENCED_TRIGGER_NAME
     , ORDERING_TYPE AS "命令类型"
     , t.*
FROM USER_TRIGGER_ORDERING t;

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8. 目录 + 对象

-- 所有用户，所有目录。
SELECT OWNER          AS "所属用户"
     , DIRECTORY_NAME AS "目录名称"
     , DIRECTORY_PATH AS "目录路径"
     , t.*
FROM SYS.ALL_DIRECTORIES t;

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-- 当前用户，所有对象。
SELECT OBJECT_NAME AS "对象名称"
     , OBJECT_TYPE AS "对象类型[TABLE|INDEX|SEQUENCE]"
     , t.*
FROM SYS.USER_OBJECTS t;

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-- 数据文件
SELECT TABLESPACE_NAME AS "表空间名", SUM(BYTES) SIZES
FROM SYS.DBA_DATA_FILES t
GROUP BY TABLESPACE_NAME;

-- 自由空间
SELECT TABLESPACE_NAME AS "表空间名", SUM(BYTES) FREES
FROM SYS.USER_FREE_SPACE t
GROUP BY TABLESPACE_NAME;

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二、Oracle 查询表结构

-- `Oracle`查询表结构。
SELECT DECODE(t2.COLUMN_ID, 1, t.TABLE_NAME, '')    AS "表名"
     , DECODE(t2.COLUMN_ID, 1, t.COMMENTS, '')      AS "表注释"
     , t2.COLUMN_NAME                               AS "列名"
     , t2.DATA_TYPE || '(' || t2.DATA_LENGTH || ')' AS "类型"
     , DECODE(t2.NULLABLE, 'N', 'N', '')            AS "NULL"
     , t2.DATA_DEFAULT                              AS "默认数据"
     , t4.CONSTRAINT_TYPE                           AS "键"
     , t3.COMMENTS                                  AS "列注释"
FROM SYS.USER_TAB_COMMENTS t
INNER JOIN SYS.USER_TAB_COLUMNS t2 ON t2.TABLE_NAME = t.TABLE_NAME
INNER JOIN SYS.USER_COL_COMMENTS t3 ON t3.TABLE_NAME = t.TABLE_NAME AND t3.COLUMN_NAME = t2.COLUMN_NAME
LEFT JOIN (
    SELECT t.TABLE_NAME, t.COLUMN_NAME, t2.CONSTRAINT_TYPE
    FROM SYS.USER_CONS_COLUMNS t
    LEFT JOIN SYS.USER_CONSTRAINTS t2 ON t2.CONSTRAINT_NAME = t.CONSTRAINT_NAME
    WHERE t2.CONSTRAINT_TYPE = 'P'
) t4 ON t4.TABLE_NAME = t.TABLE_NAME AND t4.COLUMN_NAME = t2.COLUMN_NAME
ORDER BY t.TABLE_NAME, t2.COLUMN_ID;

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