SQL Select 比较主列表和两个子列表的独占 ID

Question

我需要有关 SQL 查询的帮助。我有一个"Master list table (X and Y categories)"。我必须将上面的列表与两个子列表表进行比较 - "List X" 和 "List Y"

表：

*MasterList*              
ID Cat Status           
101 X  Ready            
102 X  Ready            
103 Y  Dispatched Y     
104 X  Dispatched Y     
105 Y  Dispatched       
106 X  Ready
107 X  Dispatched Y
108 Y  Ready Y
109 X  Dispatched
110 Y  Dispatched
111 X  Ready Y
112 X  Dispatched
113 X  Dispatched Y

*ListX* 
ID    
101   
102   
106
109
112

*ListY*
ID
105
110

我正在尝试创建一个输出的查询：

Cat-X 在 List-X
Cat-Y 在 List-Y

输出

ID  Cat Status
103  Y  Dispatched
104  X  Dispatched
107  X  Dispatched
108  Y  Ready
111  X  Ready
113  X  Dispatched

谢谢，

拉维

Answer 1

您可以通过多种方式完成此操作，例如此处：

select * 
  from master_list 
  where (cat = 'X' and id not in (select id from listx))
     or (cat = 'Y' and id not in (select id from listy))

也可以尝试 not exists 和简单连接。

在Oracle中测试数据并输出：

create table master_list (id int, cat varchar2(1), status varchar2(15));
insert into master_list values (101, 'X', 'Ready');
insert into master_list values (102, 'X', 'Ready');
insert into master_list values (103, 'Y', 'Dispatched');
insert into master_list values (104, 'X', 'Dispatched');
insert into master_list values (105, 'Y', 'Dispatched');
insert into master_list values (106, 'X', 'Ready');
insert into master_list values (107, 'X', 'Dispatched');
insert into master_list values (108, 'Y', 'Ready');
insert into master_list values (109, 'X', 'Dispatched');
insert into master_list values (110, 'Y', 'Dispatched');
insert into master_list values (111, 'X', 'Ready');
insert into master_list values (112, 'X', 'Dispatched');
insert into master_list values (113, 'X', 'Dispatched');

create table listx as (select column_value id 
                         from table(sys.odcinumberlist(101, 102, 106, 109, 112)));
create table listy as (select column_value id 
                         from table(sys.odcinumberlist(105, 110)));

  ID CAT STATUS
---- --- ---------------
103 Y   Dispatched
104 X   Dispatched
107 X   Dispatched
108 Y   Ready
111 X   Ready
113 X   Dispatched

Answer 2

您可以在 WHERE 子句中使用 OR：

SELECT ID, CAT, STATUS 
  FROM MASTERLIST M
 WHERE (M.ID NOT IN (SELECT ID FROM LISTX) AND CAT = 'X')
    OR (M.ID NOT IN (SELECT ID FROM LISTY) AND CAT = 'Y');

其他替代方法是将两个查询中的规则分开，然后与 UNION ALL 组合：

SELECT ID, CAT, STATUS 
  FROM MASTERLIST M
 WHERE M.ID NOT IN (SELECT ID FROM LISTX) AND CAT = 'X'
 UNION ALL
SELECT ID, CAT, STATUS 
  FROM MASTERLIST M
 WHERE M.ID NOT IN (SELECT ID FROM LISTY) AND CAT = 'Y';

两种技术都会产生相同的结果。实际上，一些优化器（如 Oracle 的）会尝试将第一个解决方案实时转换为第二个解决方案。这就是所谓的 OR 扩展。

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