将Oracle查询转换为SQL Server？

Question

Oracle查询是：

select  t3.id, 
        t4.caption || '>' || t3.caption  
from (
    SELECT  t1.id as id, 
            (t2.caption || '>' || t1.caption) as caption, 
            t2.pid as pid  
    FROM ParentChild T1, ParentChild T2 
    WHERE T1.pid = T2.id(+)
) t3, 
(
    SELECT  t1.id as id, 
            (t2.caption || '>' || t1.caption) as caption, 
            t2.pid as pid  
    FROM ParentChild T1, ParentChild T2 
    WHERE T1.pid = T2.id(+)
) t4 
where t3.pid = t4.id(+);

输出：

ID                     T4.CAPTION||'>'||T3.CAPTION
---------------------- ---------------------------
4                      a>b>c>d                    
3                      >a>b>c                     
1                      >>a                        
2                      >a>b                       
5                      >a>e

我需要等效的SQL Server查询...

Answer 1

尝试以下查询;）

SELECT t3.id, t4.caption + '>' + t3.caption
FROM (
    SELECT t1.id as id, (t2.caption + '>' + t1.caption) as caption, t2.pid as pid 
    FROM ParentChild T1
    LEFT JOIN ParentChild T2
    ON T1.pid = T2.id) t3
LEFT JOIN (
    SELECT t1.id as id, (t2.caption + '>' + t1.caption) as caption, t2.pid as pid  
    FROM ParentChild T1
    LEFT JOIN ParentChild T2
    ON T1.pid = T2.id) t4 ON t3.pid = t4.id;