所以我需要列出代表不同工作室的每个销售人员的salesID，firstName，lastName，我有以下内容（这是来自SalesPeople表）
+---------+-----------+----------+---------------------+
| SalesID | firstName | LastName | StudioName |
+---------+-----------+----------+---------------------+
| 1 | Bob | Bentley | MakeTrax |
| 1 | Bob | Bentley | Lone Star Recording |
| 1 | Bob | Bentley | Pacific Rim |
| 2 | Lisa | Williams | MakeTrax |
| 2 | Lisa | Williams | Lone Star Recording |
| 2 | Lisa | Williams | Pacific Rim |
| 3 | Clint | Sanchez | MakeTrax |
| 3 | Clint | Sanchez | Lone Star Recording |
| 3 | Clint | Sanchez | Pacific Rim |
| 4 | Scott | Bull | MakeTrax |
| 4 | Scott | Bull | Lone Star Recording |
| 4 | Scott | Bull | Pacific Rim |
+---------+-----------+----------+---------------------+
所以我想要的只是三个记录显示三个不同工作室的销售人员
**I've tried**
SELECT DISTINCT a.SalesID, a.FirstName, a.LastName, b.StudioName FROM SalesPeople a JOIN Studios b;
但我得到了这个
+---------+-----------+----------+---------------------+
| SalesID | firstName | LastName | StudioName |
+---------+-----------+----------+---------------------+
| 1 | Bob | Bentley | MakeTrax |
| 1 | Bob | Bentley | Lone Star Recording |
| 1 | Bob | Bentley | Pacific Rim |
| 2 | Lisa | Williams | MakeTrax |
| 3 | Clint | Sanchez | Lone Star Recording |
| 3 | Clint | Sanchez | Pacific Rim |
| 4 | Scott | Bull | MakeTrax |
| 4 | Scott | Bull | Lone Star Recording |
| 4 | Scott | Bull | Pacific Rim |
+---------+-----------+----------+---------------------+
如何区分以找到代表一个工作室的三个不同的人？
答案 0 :(得分：2)
从您的不同内容中删除StudioName。