sql查询结果重复

Question

大家好，首先我有这样的表 t1

ID  cid     enter     sort
===================
1             20
2      1                5 
3.     1.               6
4             10    
5      4                 2
6.             30

我需要得到这样的结果

ID  enter    sort     stock
===============================
1    20       11        9
4    10        2          8
6.    30.      0.        30

什么意思 获取 cid 为空的所有 id 获取输入编号 然后获取所有cid，其中cid =id取排序号的总和 然后最后stock = enter - sort

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like mu db 结果一定是这样的

ID  enter    sort     stock
===============================
18    1P       6        4

我的查询

 SELECT        p_stock.id, p_stock.code, p_stock.quant_entr, SUM(p_stock_1.quant_sort) AS Expr1
FROM            (p_stock INNER JOIN
                         p_stock p_stock_1 ON p_stock.id = p_stock_1.cid)
HAVING        (p_stock.id = 18) AND (p_stock.code = 27)

感谢您的帮助

Answer 1

我觉得你可以用join:

select t1.id, t1.enter, t2.sort, (t1.enter - t2.sort) as stock
from t as t1 join
     t as t2
     on t2.id = t1.id + 1
where t1.id in (1, 3)   -- or perhaps all odd numbers