员工表：
+--------+----------+-----------+------------+----------+-----------------+---------+--------------------+--------------------+
| emp_id | fname | lname | start_date | end_date | superior_emp_id | dept_id | title | assigned_branch_id |
+--------+----------+-----------+------------+----------+-----------------+---------+--------------------+--------------------+
| 1 | Michael | Smith | 2005-06-22 | NULL | NULL | 3 | President | 1 |
| 2 | Susan | Barker | 2006-09-12 | NULL | 1 | 3 | Vice President | 1 |
| 3 | Robert | Tyler | 2005-02-09 | NULL | 1 | 3 | Treasurer | 1 |
| 4 | Susan | Hawthorne | 2006-04-24 | NULL | 3 | 1 | Operations Manager | 1 |
| 5 | John | Gooding | 2007-11-14 | NULL | 4 | 2 | Loan Manager | 1 |
| 6 | Helen | Fleming | 2008-03-17 | NULL | 4 | 1 | Head Teller | 1 |
| 7 | Chris | Tucker | 2008-09-15 | NULL | 6 | 1 | Teller | 1 |
| 8 | Sarah | Parker | 2006-12-02 | NULL | 6 | 1 | Teller | 1 |
| 9 | Jane | Grossman | 2006-05-03 | NULL | 6 | 1 | Teller | 1 |
| 10 | Paula | Roberts | 2006-07-27 | NULL | 4 | 1 | Head Teller | 2 |
| 11 | Thomas | Ziegler | 2004-10-23 | NULL | 10 | 1 | Teller | 2 |
| 12 | Samantha | Jameson | 2007-01-08 | NULL | 10 | 1 | Teller | 2 |
| 13 | John | Blake | 2004-05-11 | NULL | 4 | 1 | Head Teller | 3 |
| 14 | Cindy | Mason | 2006-08-09 | NULL | 13 | 1 | Teller | 3 |
| 15 | Frank | Portman | 2007-04-01 | NULL | 13 | 1 | Teller | 3 |
| 16 | Theresa | Markham | 2005-03-15 | NULL | 4 | 1 | Head Teller | 4 |
| 17 | Beth | Fowler | 2006-06-29 | NULL | 16 | 1 | Teller | 4 |
| 18 | Rick | Tulman | 2006-12-12 | NULL | 16 | 1 | Teller | 4 |
+--------+----------+-----------+------------+----------+-----------------+---------+--------------------+--------------------+
查询：
SELECT e1.fname, e1.lname,
'VS' AS vs,
e2.fname, e2.lname
FROM employee e1
INNER JOIN employee e2
ON e1.emp_id < e2.emp_id
WHERE e1.title = "Teller" AND e2.title = "Teller";
结果：
+----------+----------+----+----------+----------+
| fname | lname | vs | fname | lname |
+----------+----------+----+----------+----------+
| Chris | Tucker | VS | Sarah | Parker |
| Chris | Tucker | VS | Jane | Grossman |
| Chris | Tucker | VS | Thomas | Ziegler |
| Chris | Tucker | VS | Samantha | Jameson |
| Chris | Tucker | VS | Cindy | Mason |
| Chris | Tucker | VS | Frank | Portman |
| Chris | Tucker | VS | Beth | Fowler |
| Chris | Tucker | VS | Rick | Tulman |
| Sarah | Parker | VS | Jane | Grossman |
| Sarah | Parker | VS | Thomas | Ziegler |
| Sarah | Parker | VS | Samantha | Jameson |
| Sarah | Parker | VS | Cindy | Mason |
| Sarah | Parker | VS | Frank | Portman |
| Sarah | Parker | VS | Beth | Fowler |
| Sarah | Parker | VS | Rick | Tulman |
| Jane | Grossman | VS | Thomas | Ziegler |
| Jane | Grossman | VS | Samantha | Jameson |
| Jane | Grossman | VS | Cindy | Mason |
| Jane | Grossman | VS | Frank | Portman |
| Jane | Grossman | VS | Beth | Fowler |
| Jane | Grossman | VS | Rick | Tulman |
| Thomas | Ziegler | VS | Samantha | Jameson |
| Thomas | Ziegler | VS | Cindy | Mason |
| Thomas | Ziegler | VS | Frank | Portman |
| Thomas | Ziegler | VS | Beth | Fowler |
| Thomas | Ziegler | VS | Rick | Tulman |
| Samantha | Jameson | VS | Cindy | Mason |
| Samantha | Jameson | VS | Frank | Portman |
| Samantha | Jameson | VS | Beth | Fowler |
| Samantha | Jameson | VS | Rick | Tulman |
| Cindy | Mason | VS | Frank | Portman |
| Cindy | Mason | VS | Beth | Fowler |
| Cindy | Mason | VS | Rick | Tulman |
| Frank | Portman | VS | Beth | Fowler |
| Frank | Portman | VS | Rick | Tulman |
| Beth | Fowler | VS | Rick | Tulman |
+----------+----------+----+----------+----------+
意向：
我想把人们配对在一起，好像员工在玩象棋游戏一样，一个员工在第一轮中只与一个人比赛，而不是3个或4个不同的人。例如，我不希望Chris Tucker在第一轮对阵Sarah，Jane，Thomas等。我希望他只与一个对手搭档。如果他或他的对手失去了他们的外出。
我该怎么做？
答案 0 :(得分：1)
我会通过随机枚举名称然后成对选择它来解决这个问题：
ORDER BY这假设您拥有偶数员工，这似乎被隐含地假设为问题的一部分。