sql - 如何返回在 SQL 中只返回一条记录的 ID？

Question

我目前已经修剪了我的数据集的一部分，但我需要进一步过滤它。

我的目标是仅隔离返回单行的那些 ID。

例如，使用如下数据集：

ID          Client Name                  Client Manager
1           XYZ Corp.                    Ralph
2           Bob's Marketplace            Marianne
2           Bob's Marketplace            David
3           Davis Auto Repair            Ralph
3           Davis Auto Repair            Marianne
4           Everything Inc.              David
5           Pet World                    Marianne

我需要返回：

ID          Client Name                  Client Manager
1           XYZ Corp.                    Ralph
4           Everything Inc.              David
5           Pet World                    Marianne

Answer 1

SELECT ID, 
       Client_Name, 
       Client_Manager
FROM table_name
WHERE ID IN 
(
    SELECT ID 
    FROM table_name
    GROUP BY ID
    HAVING COUNT(*) = 1
)

Answer 2

SELECT *
FROM your_table a, (SELECT ID FROM your_table
                    GROUP BY ID
                    HAVING COUNT(*) = 1) b
WHERE a.ID = b.ID;

见 SQLFiddle 演示

Answer 3

SELECT ID, [Client Name], min([Client Manager]) as [Client Manager]
FROM dbo.Table1
GROUP BY ID, [Client Name]
HAVING COUNT(*) = 1

Answer 4

尝试这个

SELECT ID, [Client Name], [Client Manager] FROM Table1
WHERE ID IN 
(
  SELECT ID FROM Table1
  GROUP BY ID
  HAVING COUNT(ID) = 1
)