sql - Select and Update with join 给出不同的记录

Question

我有两个表有关系

• 表分配
• table 票

赋值表中有一个字段是status。所以我从状态为 complete 的表分配中获取记录，返回 6909 条记录

然后我使用内部连接返回记录，条件为 complete 也返回 6909 记录。

但是，当我使用连接更新表并使用更新 6625 记录而不是 6909 的相同条件时。查询或其他任何问题是否有问题？请指导

查询:

首先:返回6909条记录

SELECT * FROM [ITSC].[dbo].[assignment] where assignment_status = 'Completed' 

第二个:返回6909条记录

SELECT tickets.ticket_submitted_by , tickets.ticket_type , tickets.ticket_open_date , tickets.ticket_priority , tickets.ticket_description , assignment.staff_name,assignment.assigned_time_start,assignment.assigned_time_end,assignment.assignment_status
from tickets 
inner join 
assignment 
on tickets.ticket_id = assignment.ticket_id
where assignment.assignment_status = 'Completed'

第三:更新 6625 条记录而不是 6909

 update tickets set tickets.ticket_close_date = '2015-04-29' 
,tickets.ticket_close_time = '2015-04-29 09:25:40.670' from tickets
 inner join assignment
 on tickets.ticket_id = assignment.ticket_id
 where assignment.assignment_status = 'Completed'

Answer 1

你能试试这个查询吗

 update tickets set tickets.ticket_close_date = '2015-04-29' 
                    ,tickets.ticket_close_time = '2015-04-29 09:25:40.670' 
    from assignment
    where  tickets.ticket_id = assignment.ticket_id
    and  assignment.assignment_status = 'Completed'