两个表中的工会

Question

自动产生的id我有两个表：由活动和简单的活动：

composed_activities

id | name  
1 | Activity 1  
5 | Activity 2 

simple_activities

id | name  
1 | S Activity 1  
2 | S Activity 2  
3 | S Activity 3 

我需要一个查询返回一个新生成的id，带有'+'前缀和简化的组合活动Ë那些与“ - ”前缀：

id | name 

1 | + Activity 1  
2 | + Activity 5  
3 | - S Activity 1  
4 | - S Activity 2  
5 | - S Activity 3 

到目前为止，我只设法加入这两个表，但不会自动生成一个ID：

SELECT id, CONCAT('- ',name) as name 
FROM simple_activities 
UNION 
SELECT id,CONCAT('+ ',name) AS name 
FROM composed_activities 

有人能告诉我如何生成的ID？提前致谢。

Answer 1

总结你联合成一个子查询，然后使用ROW_NUMBER()窗函数生成您的ID：

SELECT 
    ROW_NUMBER() OVER (ORDER BY name ASC) as newid, 
    id as oldid, 
    name 
FROM 
    (SELECT 
     id, 
     CONCAT('- ',name) as name 
    FROM simple_activities 
    UNION 
    SELECT 
     id, 
     CONCAT('+ ',name) AS name 
    FROM composed_activities) subquery 

Answer 2

JNevill是正确的，是正确的答案，在更少的代码。

我使用CTE张贴，因为我觉得他们更容易阅读：

DECLARE @composed_activities TABLE (id int, name varchar(20)) 
INSERT INTO @composed_activities (id, name) 
VALUES (1,'Activity 1'), (5,'Activity 2') 

DECLARE @simple_activities TABLE (id int, name varchar(20)) 
INSERT INTO @simple_activities (id, name) 
VALUES (1,'S Activity 1'), (2,' S Activity 2'), (3,' S Activity 3') 

;WITH X (id, name) AS 
(
    SELECT id,'+ '+name FROM @composed_activities 
    UNION ALL 
    SELECT id,'- '+name FROM @simple_activities 
), Y AS 
    (
     SELECT ROW_NUMBER() OVER(ORDER BY name,id) AS id, name 
     FROM X 
    ) 

SELECT * 
FROM Y