如何使用低权限的 PL-SQL 在 Oracle 中获取列数据类型?

问题描述

我对 Oracle 数据库中的几个表具有只读"访问权限.我需要获取某些列的架构信息.我想使用类似于 MS SQL 的 sp_help 的东西.

I have "read only" access to a few tables in an Oracle database. I need to get schema information on some of the columns. I'd like to use something analogous to MS SQL's sp_help.

我看到此查询中列出了我感兴趣的表:

I see the table I'm interested in listed in this query:

SELECT * FROM ALL_TABLES

当我运行这个查询时，Oracle 告诉我在架构中找不到表"，是的，参数是正确的.

When I run this query, Oracle tells me "table not found in schema", and yes the parameters are correct.

SELECT 
DBMS_METADATA.GET_DDL('TABLE', 'ITEM_COMMIT_AGG', 'INTAMPS') AS DDL
FROM DUAL;

在使用我的 Oracle 通用转换器 9000 后，我推测这不起作用，因为我没有足够的权限.鉴于我的限制，如何使用 PL-SQL 语句获取表中列的数据类型和数据长度?

After using my Oracle universal translator 9000 I've surmised this doesn't work because I don't have sufficient privileges. Given my constraints how can I get the datatype and data length of a column on a table I have read access to with a PL-SQL statement?

推荐答案

ALL_TAB_COLUMNS 应该可以从 PL/SQL 查询.DESC 是一个 SQL*Plus 命令.

ALL_TAB_COLUMNS should be queryable from PL/SQL. DESC is a SQL*Plus command.

SQL> desc all_tab_columns;
 Name                                      Null?    Type
 ----------------------------------------- -------- ----------------------------
 OWNER                                     NOT NULL VARCHAR2(30)
 TABLE_NAME                                NOT NULL VARCHAR2(30)
 COLUMN_NAME                               NOT NULL VARCHAR2(30)
 DATA_TYPE                                          VARCHAR2(106)
 DATA_TYPE_MOD                                      VARCHAR2(3)
 DATA_TYPE_OWNER                                    VARCHAR2(30)
 DATA_LENGTH                               NOT NULL NUMBER
 DATA_PRECISION                                     NUMBER
 DATA_SCALE                                         NUMBER
 NULLABLE                                           VARCHAR2(1)
 COLUMN_ID                                          NUMBER
 DEFAULT_LENGTH                                     NUMBER
 DATA_DEFAULT                                       LONG
 NUM_DISTINCT                                       NUMBER
 LOW_VALUE                                          RAW(32)
 HIGH_VALUE                                         RAW(32)
 DENSITY                                            NUMBER
 NUM_NULLS                                          NUMBER
 NUM_BUCKETS                                        NUMBER
 LAST_ANALYZED                                      DATE
 SAMPLE_SIZE                                        NUMBER
 CHARACTER_SET_NAME                                 VARCHAR2(44)
 CHAR_COL_DECL_LENGTH                               NUMBER
 GLOBAL_STATS                                       VARCHAR2(3)
 USER_STATS                                         VARCHAR2(3)
 AVG_COL_LEN                                        NUMBER
 CHAR_LENGTH                                        NUMBER
 CHAR_USED                                          VARCHAR2(1)
 V80_FMT_IMAGE                                      VARCHAR2(3)
 DATA_UPGRADED                                      VARCHAR2(3)
 HISTOGRAM                                          VARCHAR2(15)

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