Question

我有两张表tbl_Attendance和tbl_leave。这些表的值如下所示。

tbl_leave ：

id | empcode | Marked | datetime_From | datetime_To
1  | emp1    | 2      | 19-10-2018    | 22-10-2018
1  | emp2    | 2      | 20-10-2018    | 20-10-2018

tbl_Attendance ：

id | empcode | Marked | datetime_
1  | emp1    | 1      | 20-10-2018
1  | emp2    | 1      | 20-10-2018
1  | emp3    | 1      | 20-10-2018
1  | emp4    | 1      | 20-10-2018
1  | emp5    | 1      | 20-10-2018

现在我想将tbl_Attendance列Marked更改为2，如果表tbl_leave中存在

tbl_Attendance

id | empcode | Marked | datetime_
1  | emp1    | 2      | 20-10-2018
1  | emp2    | 2      | 20-10-2018
1  | emp3    | 1      | 20-10-2018
1  | emp4    | 1      | 20-10-2018
1  | emp5    | 1      | 20-10-2018

请有人帮助我

Answer 1

此更新查询应解决您的问题，请尝试使用。

update tbl_Attendance set Marked=2 where empcode in (select empcode from tbl_leave)

如果您想根据tbl_leave中的日期更新tbl_Attendance中的Marked，那么您可以尝试此查询：

update tbl_Attendance set Marked=2 where empcode in 
(SELECT t.empcode from 
(SELECT TL.empcode,TA.datetime_,TL.datetime_From,TL.datetime_To from 
tbl_leave TL 
INNER JOIN tbl_attendance TA ON TL.empCode=TA.empcode) t
where t.datetime_ BETWEEN t.datetime_From and t.datetime_To)

如果tbl_Attendance中的dateTime_介于tbl_Leave中的dateTime_From和dateTime_To之间，则上述查询将更新标记为2.

如果SQL Server中存在数据，则标记为2

1 个答案: