Question

使用SQL Server，我有：

     DATE                Cookie
===============================
1   10/04/2018 11:00:00   123
2   10/04/2018 12:00:00   123
3   10/04/2018 13:00:00   321
4   10/04/2018 14:00:00   123

我想要什么：

    DATE                Cookie
================================
3   10/04/2018 13:00:00  321

我真的需要一些帮助，谢谢大家。

Answer 1

您可以在下面尝试-

select * from tablename a
  where exists (select 1 from tablename b where a.Cookie=b.Cookie having count(b.Cookie)=1)

Answer 2

因此，您只需要Cookie包含一个条目的行。可以这样做：

SELECT * 
FROM TableA AS A
WHERE Cookie IN ( SELECT Cookie, COUNT(*) 
                  FROM TableB AS B
                  GROUP BY Cookie
                  HAVING COUNT(*) = 1 )

Answer 3

您可以通过以下方式使用input_layer = Input(shape=(size, size, chs)) norm = Lambda(pre_process, output_shape=(size, size, chs))(input_layer) conv_1 = Conv2D(16, kernel_size=(1, 1), strides=(1, 1), padding='valid', activation='relu')(norm)，但可以在{fa06的解决方案中使用in

exists

Answer 4

您可以使用此：

SELECT Cookie,
    MAX[DATE]
FROM table_name
GROUP BY Cookie
HAVING COUNT(*) = 1;

Answer 5

您可以使用NOT EXISTS：

SELECT t.*
FROM table t
WHERE NOT EXISTS (SELECT 1 FROM table t1 WHERE t1.Cookie = t.Cookie AND t1.DATE <> t.DATE);

如果（Cookie，DATE）上有合适的索引，这样做会更好。

选择1列SQL Server上具有重复值的行

5 个答案: