如何在sql中查找父关系和子关系

我有下面这样的数据，并试图得到家长所花时间的总和

输入

预期产量

ID_P    Sum(SLA)
1       1.2
8       1.8

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有人能帮我使用SQL吗。

您可以使用递归查询。我们的想法是从父行开始，据我所知，父行由列

fl

标识。然后你可以按照链接到孩子们。最后一步是聚合：

with cte as (
    select idp_p, id_c, sla from mytable where fl = 'Y'
    union all
    select c.id_p, t.id_c, t.sla
    from cte c
    inner join mytable t on t.id_p = c.id_c
)
select id_p, sum(sla) as sum_sla from cte group by id_p

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您正在使用哪个dbms？SQL Server数据库尝试递归cte。

with cte as (
    select idp_p, id_c, sla from mytable where fl = 'Y'
    union all
    select c.id_p, t.id_c, t.sla
    from cte c
    inner join mytable t on t.id_p = c.id_c
)
select id_p, sum(sla) as sum_sla from cte group by id_p