sql - 简单的 SQL 语句

Question

我已经想太多了。假设我有一个表 TEST(refnum VARCHAR(5))

    |refnum|
    --------
    | 12345|
    | 56873|
    | 63423|
    | 12345|
    | 56873|
    | 12345|

我希望我的“观点”看起来像这样

    |refnum| count|
    ---------------
    | 12345|   3  |
    | 56873|   2  |

因此，要求是每个引用句柄的计数必须 > 1。我在解决这个问题时遇到了一些麻烦。预先感谢您的帮助。

Answer 1

除非我遗漏了什么，否则这看起来很简单

select refnum, count(*) from test group by refnum having count(*) > 1

Answer 2

select refnum, count(*)
from table
group by refnum

Answer 3

这是 SQL Server 版本：

CREATE VIEW vRefnumCounts AS
SELECT refnum, 
count(1) as [count] 
FROM test 
GROUP BY refnum 
HAVING count(1) > 1

SELECT *
FROM vRefnumCounts 
ORDER BY refnum

您说的是“视图”，但现在我认为您的意思是结果集意义上的......