Question

我有如下表格，

Txn_Id    Txn_Type
___________________
1         101
1         102
1         103
1         104
2         101
2         102
2         104
3         101
3         104

我想要只有txn_type 101和104的行。例如，对于上面的数据我只能得到Txn_Id“3”。

我尝试了下面的结果。是否可以通过单一查询来实现此目的。

Select txn_id from Txn where txn_id in (Select txn_id from Txn where txn_id = 101) and txn_id =104.

Answer 1

Select txn_id from Txn where txn_type in (101,104)

选项2

    Select txn_id from Txn where (txn_type = 101 OR txn_type=104)

仅获得＆＃34; 3＆＃34;

Select distinct txn_id from Txn t1 where (txn_type = 101 OR txn_type=104)
and not exists(
select 1 from Txn t2 where t2.txn_type IN (102,103) and t2.txn_id = t1.txn_id
)

Answer 2

您好根据您的上述评论，您只需要txn_id = 3（最大）

请找到以下代码。

DECLARE @Table1  TABLE 
    (txn_id int, Txn_Type int)
;

INSERT INTO @Table1
     (txn_id , Txn_Type )
VALUES
    (1, 101),
    (1, 102),
    (1, 103),
    (1, 104),
    (2, 101),
    (2, 102),
    (2, 104),
    (3, 101),
    (3, 104)
  ;


Select max(txn_id ),Txn_Type 
  from @Table1 where item in (101,104)
  group by Txn_Type

Answer 3

正如balaji指出的那样，@ Ayush解决方案并不灵活，因为如果您在表（4,101）和（4,104）中添加另一对记录，则会返回不正确的结果。 IMO，你必须将表连接到自己进行一些过滤，如下所示：

DECLARE @Table1  TABLE 
    (txn_id int, Txn_Type int);

INSERT INTO @Table1
     (txn_id , Txn_Type )
VALUES
    (1, 101),
    (1, 102),
    (1, 103),
    (1, 104),
    (2, 101),
    (2, 102),
    (2, 104),
    (3, 101),
    (3, 104),
    (4, 101),
    (4, 104);

select t1.*
from @Table1 t1
inner join (select txn_id, count(*) as total
        from @Table1 
        group by Txn_id
        having count(*) < 3
        ) t2 on t2.txn_id = t1.txn_id
where t1.Txn_Type in (101,104)

sql server查询澄清

3 个答案: