Question

我有两个表，一个用于销售人员，一个用于乐队成员。我需要列出 sales people who represent members who ARE NOT in california

销售人员表

 +---------+-----------+----------+
 | salesid | firstname | lastname |
 +---------+-----------+----------+
 |       1 | Bob       | Bentley  |
 |       2 | Lisa      | Williams | 
 |       3 | Clint     | Sanchez  |
 |       4 | Scott     | Bull     |
 +---------+-----------+----------+

成员表

+---------+-----------+-----------+--------+
| salesid | firstname | lastname  | region |
+---------+-----------+-----------+--------+
|       2 | Bryce     | Sanders   | NC     |
|       3 | Marcellin | Lambert   | VA     |
|       3 | Caroline  | Kale      | VA     |
|       1 | Kerry     | Fernandez | VA     |
|       2 | Roberto   | Alvarez   | IN     |
|       1 | Mary      | Chrisman  | IN     |
|       3 | Carol     | Wanner    | TX     |
|       2 | Warren    | Boyer     | TX     |
|       1 | Bonnie    | Taft      | VT     |
|       3 | Terry     | Irving    | GA     |
|       2 | Louis     | Holiday   | IL     |
|       2 | Michelle  | Henderson | GA     |
|       3 | Bobby     | Crum      | VT     |
|       2 | Tony      | Wong      | ONT    |
|       2 | Vic       | Cleaver   | VT     |
|       1 | Frank     | Payne     | NY     |
|       1 | Roberto   | Goe       | OH     | 
|       1 | Jose      | MacArthur | CA     |
|       3 | Doug      | Finney    | GA     |
|       3 | Brian     | Ranier    | ONT    |
|       2 | William   | Morrow    | NY     |
|       2 | Aiden     | Franks    | TX     |
|       2 | Davis     | Goodman   | OH     |
+---------+-----------+-----------+--------+

我试过了

SELECT a.firstname, a.lastname, b.region FROM salespeople a LEFT JOIN members b ON 
b.region != "CA";

返回约88条记录，因为所有4名销售人员代表每个成员。这引出了我的下一个问题， I also need to list all salespeople who do not represent any members who are located in California 。我的查询有什么不同？

Answer 1

SELECT b.firstname, b.lastname, GROUP_CONCAT(a.region) regions
FROM members a 
LEFT JOIN salespeople b ON a.salesid = b.salesid 
GROUP BY b.firstname,b.lastname
HAVING NOT FIND_IN_SET("CA", regions);

<强> SQLFIDDLE

Answer 2

这将为您提供不代表CA的销售人员。

SELECT a.firstname, a.lastname, b.region FROM salespeople a LEFT JOIN members b 
ON a.salesid = b.salesid where b.region != "CA" 
and b.salesid NOT IN (select c.salesid from members c where b.region = "CA");

Answer 3

SELECT a.firstname, a.lastname ,b.region
FROM salespeople a, members b
WHERE a.salesid = b.salesid
AND a.salesid NOT IN(
  SELECT DISTINCT c.salesid
  FROM members c
  WHERE c.region = 'CA'
)
GROUP BY a.salesid,b.region
HAVING b.region !='CA'

这个答案没有使用join，希望对此有所帮助。

Answer 4

SELECT 
  a.firstname, 
  a.lastname, 
  b.region 
FROM salespeople a 
  LEFT JOIN members b ON a.salesid = b.salesid 
WHERE b.region != "CA"

MYSQL：列出所有代表不在加利福尼亚州的会员的销售人员

4 个答案: