SQL Server - 在派生表中选择一列中计数> 1的行答案

【问题标题】：SQL Server - Select Rows in Derived Table that have count > 1 of value in one columnSQL Server - 在派生表中选择一列中计数> 1的行
【发布时间】：2018-10-08 19:24:26
【问题描述】：

请帮忙。我有以下选择查询，并且只想选择列 A.Name 重复超过 1 次的行：

SELECT
    A.Payer,
    A.PaymentDate,
    A.Name
FROM 
    (SELECT
         T.InstitutionRoleXrefLongName AS 'Payer',
         T.PaymentDate AS 'PaymentDate',
         T.FullName AS 'Name'
     FROM 
         Transfer T
     UNION ALL
     SELECT
         T.InstitutionRoleXrefLongName AS 'Payer',
         T.PaymentDate AS 'PaymentDate',
         T.FullName AS 'Name'
     FROM 
         TransferClosed T) A
WHERE 
    PaymentDate BETWEEN '20180101' AND '20180331 23:59:59'

【问题讨论】：

标签： sql-server having derived-table

【解决方案1】：

使用CTE和self join得到大于1的count。

你可以试试这个。

 ;with CTE AS (
    SELECT
        A.Payer,
        A.PaymentDate,
        A.Name
    FROM (
        SELECT
            T.InstitutionRoleXrefLongName AS 'Payer',
            T.PaymentDate AS 'PaymentDate',
            T.FullName AS 'Name'
        FROM Transfer T
    UNION ALL
        SELECT
            T.InstitutionRoleXrefLongName AS 'Payer',
            T.PaymentDate AS 'PaymentDate',
            T.FullName AS 'Name'
        FROM TransferClosed T
    ) A
    WHERE PaymentDate Between '20180101' AND '20180331 23:59:59'
)
select t2.*
from (
    SELECT name,count(1) totle 
    FROM CTE
    GROUP BY Name
) t1 inner join CTE t2 
ON t1.totle > 1 and t1.Name = t2.Name

sqlfiddle CTE 模拟你的结果集

sqlfiddle:http://sqlfiddle.com/#!18/cc68f/9

【讨论】：

【解决方案2】：

WITH Payments AS (
    SELECT
        A.Payer, A.PaymentDate, A.Name,
        COUNT(*) OVER (PARTITION BY A.Name) AS NameCount
    FROM (
        SELECT
            T.InstitutionRoleXrefLongName AS Payer,
            T.PaymentDate AS PaymentDate,
            T.FullName AS Name
        FROM Transfer T
        UNION ALL
        SELECT
            T.InstitutionRoleXrefLongName AS Payer,
            T.PaymentDate AS PaymentDate,
            T.FullName AS Name
        FROM TransferClosed T
    ) A
    WHERE PaymentDate Between '20180101' AND '20180331 23:59:59'
)
SELECT * FROM Payments WHERE Name_Count > 1;

您可能会发现通过在联合的两侧复制该日期过滤器，查询的性能会更好。只是一个想法。

【讨论】：