Leetcode 607. Sales Person

Description

Given three tables: salesperson, company, orders.
Output all the names in the table salesperson, who didn’t have sales to company 'RED'.

Example
Input

Table: salesperson

+----------+------+--------+-----------------+-----------+
| sales_id | name | salary | commission_rate | hire_date |
+----------+------+--------+-----------------+-----------+
|   1      | John | 100000 |     6           | 4/1/2006  |
|   2      | Amy  | 120000 |     5           | 5/1/2010  |
|   3      | Mark | 65000  |     12          | 12/25/2008|
|   4      | Pam  | 25000  |     25          | 1/1/2005  |
|   5      | Alex | 50000  |     10          | 2/3/2007  |
+----------+------+--------+-----------------+-----------+

The table salesperson holds the salesperson information. Every salesperson has a sales_id and a name.

Table: company

+---------+--------+------------+
| com_id  |  name  |    city    |
+---------+--------+------------+
|   1     |  RED   |   Boston   |
|   2     | ORANGE |   New York |
|   3     | YELLOW |   Boston   |
|   4     | GREEN  |   Austin   |
+---------+--------+------------+

The table company holds the company information. Every company has a com_id and a name.

Table: orders

+----------+----------+---------+----------+--------+
| order_id |  date    | com_id  | sales_id | amount |
+----------+----------+---------+----------+--------+
| 1        | 1/1/2014 |    3    |    4     | 100000 |
| 2        | 2/1/2014 |    4    |    5     | 5000   |
| 3        | 3/1/2014 |    1    |    1     | 50000  |
| 4        | 4/1/2014 |    1    |    4     | 25000  |
+----------+----------+---------+----------+--------+

The table orders holds the sales record information, salesperson and customer company are represented by sales_id and com_id.

output

+------+
| name | 
+------+
| Amy  | 
| Mark | 
| Alex |
+------+

Explanation

According to order '3' and '4' in table orders, it is easy to tell only salesperson 'John' and 'Alex' have sales to company 'RED',
so we need to output all the other names in table salesperson.

 

drop table salesperson
create table salesperson (sales_id int,name varchar(25),salary int,commission_rate int,hire_date date)

insert into salesperson values (1,'John',100000,6,'2006-04-01')
insert into salesperson values (2,'Amy',120000,5,'2010-05-01')
insert into salesperson values (3,'Mark',65000,6,'2008-12-25')
insert into salesperson values (4,'Pam',25000,25,'2005-01-01')
insert into salesperson values (5,'Alex',50000,10,'2007-02-03')

Table: salesperson

+----------+------+--------+-----------------+-----------+
| sales_id | name | salary | commission_rate | hire_date |
+----------+------+--------+-----------------+-----------+
|   1      | John | 100000 |     6           | 4/1/2006  |
|   2      | Amy  | 120000 |     5           | 5/1/2010  |
|   3      | Mark | 65000  |     12          | 12/25/2008|
|   4      | Pam  | 25000  |     25          | 1/1/2005  |
|   5      | Alex | 50000  |     10          | 2/3/2007  |
+----------+------+--------+-----------------+-----------+

select * from salesperson

Table: company
+---------+--------+------------+
| com_id  |  name  |    city    |
+---------+--------+------------+
|   1     |  RED   |   Boston   |
|   2     | ORANGE |   New York |
|   3     | YELLOW |   Boston   |
|   4     | GREEN  |   Austin   |
+---------+--------+------------+

create table company(com_id int, name varchar(20),city varchar(20))

insert into company values (1,'Red','Boston')
insert into company values (2,'ORANGE','New York')
insert into company values (3,'YELLO','Boston')
insert into company values (4,'GREEN','Austin')

select * from company

Table: orders

+----------+----------+---------+----------+--------+
| order_id |  date    | com_id  | sales_id | amount |
+----------+----------+---------+----------+--------+
| 1        | 1/1/2014 |    3    |    4     | 100000 |
| 2        | 2/1/2014 |    4    |    5     | 5000   |
| 3        | 3/1/2014 |    1    |    1     | 50000  |
| 4        | 4/1/2014 |    1    |    4     | 25000  |
+----------+----------+---------+----------+--------+

create table orders (order_id int,[date] date,com_id int,sales_id int,amount int)

insert into orders values (1,'2014-01-01',3,4,100000)
insert into orders values (2,'2014-02-01',4,5,5000)
insert into orders values (3,'2014-03-01',1,1,50000)
insert into orders values (4,'2014-04-01',1,4,25000)

select * from orders

select name from salesperson where sales_id not in(
select sales_id from orders
where com_id = (select com_id from company where name='Red'))


select name from salesperson where sales_id not in
(
select o.sales_id from orders o left join company c on o.com_id=c.com_id
where c.name='Red'
)