oracle - 在 Oracle 中等效于 Ms Sql sys 表

Question

我在 oracle 中找不到所有等效的表。如;

sys.index_columns
sys.columns
sys.foreign_key_columns

是否有任何列表可以找出这些表名？我们在 mssql 中有几个查询，需要将它们转换为 oracle。

Answer 1

您正在寻找Oracle 数据字典。

MS SQL                      Oracle
------------------------    ------------------------------------------
sys.index_columns           user_indexes      and  user_ind_columns
sys.columns                 user_tab_cols
sys.foreign_key_columns     user_constraints  and  user_cons_columns

除了user_（仅限于您自己架构中的对象）之外，您还可以将all_其用于您有权访问dba_的所有对象或数据库中的所有对象（前提是您具有 DBA 授权）。

Answer 2

记录了数据字典。请参阅静态数据字典视图

您可能正在寻找以下表格：

• ALL_IND_COLUMNS
• ALL_TAB_COLUMNS
• ALL_CONS_COLUMNS

Answer 3

如果这有帮助，这里是我在我构建的“数据库浏览器”中使用的 SQL 模板。它会根据所选数据库的 RDBMS 进行自我调整，并将完全相同的数据返回到应用程序中。

在这里，您可以查询：

• 表和视图列表，包括统计表中的行数。
• 表的结构，包括索引列

---

表/视图列表

SQL 服务器：

SELECT ta.tname, sc.name AS owner, ta.ttype, SUM(pa.rows) RowCnt
 FROM
 (
     SELECT 'T' AS ttype, object_id, schema_id, name AS tname
     FROM sys.tables 
     WHERE is_ms_shipped = 0 AND name LIKE  '%{table_name_whatever}%' 
     UNION ALL
      SELECT 'V' AS ttype, object_id, schema_id, name AS tname
     FROM sys.views 
     WHERE is_ms_shipped = 0  AND name LIKE  '%{table_name_whatever}%'
) ta
LEFT JOIN sys.partitions pa ON pa.OBJECT_ID = ta.OBJECT_ID AND pa.index_id IN (1,0)
LEFT JOIN sys.schemas sc ON ta.schema_id = sc.schema_id
GROUP BY ta.tname, sc.name, ta.ttype
ORDER BY ta.tname

甲骨文

(SELECT table_name as tname, owner, 'T' AS ttype, NUM_ROWS AS RowCnt FROM all_tables WHERE table_name LIKE  '%{table_name_whatever}%') 
UNION ALL  
(SELECT view_name as tname, owner, 'V' AS ttype, NULL AS RowCnt FROM all_views WHERE view_name LIKE  '%{table_name_whatever}%') ORDER BY tname

---

表结构（cols 和基本 idx）

SQL 服务器

SELECT c.name as column_name, ty.name AS type_name, c.max_length AS col_len,
    (CASE 
        WHEN (i.name IS NOT NULL AND i.is_unique=1) THEN 'U'
        WHEN (i.name IS NOT NULL AND i.is_unique=0) THEN 'X'
        ELSE '' 
    END) AS idx,
    '' as comments
FROM sys.columns c
INNER JOIN sys.objects o                ON o.object_id=c.object_id  
INNER JOIN sys.types ty         ON c.system_type_id = ty.system_type_id AND ty.name<>'ID_Code'
LEFT  JOIN sys.index_columns ic ON o.object_id = ic.object_id AND ic.column_id = c.column_id
LEFT  JOIN sys.indexes i                ON o.object_id = i.object_id AND i.index_id = ic.index_id 
WHERE o.name = '{table_name_whatever}' 
ORDER BY C.column_id

甲骨文

SELECT  t.column_name, t.data_type as type_name, t.data_length as col_len, 
                (CASE 
                    WHEN b.uniqueness='UNIQUE' THEN 'U' 
                    WHEN b.uniqueness='NONUNIQUE' THEN 'X' 
                    ELSE '' 
              END) AS idx,
              c.comments
FROM all_tab_columns t
LEFT JOIN all_col_comments c ON c.table_name=t.table_name AND c.column_name = t.column_name
LEFT JOIN all_ind_columns a  ON a.table_name=t.table_name AND a.column_name = t.column_name
LEFT JOIN all_indexes b      ON a.index_name=b.index_name 
WHERE t.table_name='{table_name_whatever}' 
ORDER BY t.column_ID