Question

我正在使用ORACLE数据库。的修改：

我只想要列表中没有的表，而不是数据库中的所有表。

例如：在我的数据库中，存在以下表格：

a
b
c
d
e
r
s

我收到了一份表格清单：

a
b
c
v
h

我希望在我的数据库中找出哪些表缺席（不存在）。

所以：a，b，c是我的数据库中存在的那些表。所以不包括这些表我的答案是：

v and h

我的答案不是d，e，r，s

我如何编写查询以查找？

Answer 1

您可以使用

SELECT a.table_name FROM (SELECT 'A' as table_name 
               FROM DUAL UNION
               SELECT 'B' as table_name 
               FROM DUAL UNION
               SELECT 'C' as table_name 
               FROM DUAL UNION
               SELECT 'V' as table_name 
               FROM DUAL UNION
               SELECT 'H' as table_name 
               FROM DUAL) a WHERE NOT EXISTS (
SELECT 1 FROM DBA_TABLES b where b.table_name=a.table_name)

Answer 2

WITH table_names AS ( 
   SELECT 'A' AS tname FROM DUAL
   UNION ALL
   SELECT 'B' FROM DUAL
   UNION ALL
   SELECT 'C' FROM DUAL
   UNION ALL
   SELECT 'D' FROM DUAL
   UNION ALL
   SELECT 'E' FROM DUAL
)
SELECT tn.tname
FROM table_name tn
WHERE NOT EXISTS (SELECT 1  
                  FROM all_tables at
                  WHERE tn.tname = at.table_name);

WITH部分只是编写派生表（“内联视图”）的另一种（可重用）方式。

Answer 3

我会使用MINUS运算符（摘要如下）：

select table_name from table_list
minus
select table_name from db_tables
;

更全面：

with table_list as 
(     select 'A' table_name from dual    
union select 'B' table_name from dual
union select 'C' table_name from dual
union select 'V' table_name from dual
union select 'H' table_name from dual
) 
, db_tables as
(     select 'A' table_name from dual
union select 'B' table_name from dual
union select 'C' table_name from dual
union select 'D' table_name from dual
union select 'E' table_name from dual
union select 'R' table_name from dual
union select 'S' table_name from dual
)
select table_name from table_list
minus
select table_name from db_tables
;

Answer 4

SELECT table_name FROM DBA_tables WHERE table_name IN (Yourlist comes here)

例如

SELECT table_name FROM DBA_tables WHERE table_name NOT IN ('a','b','c');

Answer 5

您可以使用表格和sys.dbms_debug_vc2coll从列表中创建虚拟列。

以下应该可以解决问题：

SELECT
    column_value AS missing_table_names
FROM
    TABLE(SYS.DBMS_DEBUG_VC2COLL('a','b','c','v','h'))
WHERE
    column_value NOT IN (
        SELECT
            table_name
        FROM
            ALL_TABLES
    );

sql查询从数据库中查找缺少的表

5 个答案: