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Commit b782b28

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Update: column name
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‎problems/human-traffic-of-stadium/README.md

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Original file line numberDiff line numberDiff line change
@@ -11,15 +11,14 @@
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## 601. Human Traffic of Stadium (Hard)
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<p>X city built a new stadium, each day many people visit it and the stats are saved as these columns: <b>id</b>, <b>date</b>, <b>people</b>
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</p><p>
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Please write a query to display the records which have 3 or more consecutive rows and the amount of people more than 100(inclusive).
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</p>
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<p>X city built a new stadium, each day many people visit it and the stats are saved as these columns: <b>id</b>, <strong>visit_</strong><b>date</b>, <b>people</b></p>
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<p>Please write a query to display the records which have 3 or more consecutive rows and the amount of people more than 100(inclusive).</p>
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For example, the table <code>stadium</code>:
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<pre>
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+------+------------+-----------+
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| id | date | people |
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| id | visit_date | people |
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+------+------------+-----------+
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| 1 | 2017年01月01日 | 10 |
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| 2 | 2017年01月02日 | 109 |
@@ -31,20 +30,19 @@ For example, the table <code>stadium</code>:
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| 8 | 2017年01月08日 | 188 |
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+------+------------+-----------+
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</pre>
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<p>
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For the sample data above, the output is:
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</p>
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<p>For the sample data above, the output is:</p>
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<pre>
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+------+------------+-----------+
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| id | date | people |
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| id | visit_date | people |
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+------+------------+-----------+
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| 5 | 2017年01月05日 | 145 |
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| 6 | 2017年01月06日 | 1455 |
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| 7 | 2017年01月07日 | 199 |
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| 8 | 2017年01月08日 | 188 |
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+------+------------+-----------+
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</pre>
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<p>
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<b>Note:</b><br/>
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Each day only have one row record, and the dates are increasing with id increasing.
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</p>
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<p><b>Note:</b><br />
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Each day only have one row record, and the dates are increasing with id increasing.</p>
Lines changed: 9 additions & 9 deletions
Original file line numberDiff line numberDiff line change
@@ -1,10 +1,10 @@
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Create table If Not Exists stadium (id int, date DATE NULL, people int);
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Create table If Not Exists stadium (id int, visit_date DATE NULL, people int);
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Truncate table stadium;
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insert into stadium (id, date, people) values ('1', '2017年01月01日', '10');
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insert into stadium (id, date, people) values ('2', '2017年01月02日', '109');
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insert into stadium (id, date, people) values ('3', '2017年01月03日', '150');
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insert into stadium (id, date, people) values ('4', '2017年01月04日', '99');
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insert into stadium (id, date, people) values ('5', '2017年01月05日', '145');
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insert into stadium (id, date, people) values ('6', '2017年01月06日', '1455');
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insert into stadium (id, date, people) values ('7', '2017年01月07日', '199');
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insert into stadium (id, date, people) values ('8', '2017年01月08日', '188');
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insert into stadium (id, visit_date, people) values ('1', '2017年01月01日', '10');
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insert into stadium (id, visit_date, people) values ('2', '2017年01月02日', '109');
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insert into stadium (id, visit_date, people) values ('3', '2017年01月03日', '150');
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insert into stadium (id, visit_date, people) values ('4', '2017年01月04日', '99');
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insert into stadium (id, visit_date, people) values ('5', '2017年01月05日', '145');
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insert into stadium (id, visit_date, people) values ('6', '2017年01月06日', '1455');
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insert into stadium (id, visit_date, people) values ('7', '2017年01月07日', '199');
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insert into stadium (id, visit_date, people) values ('8', '2017年01月08日', '188');

‎problems/sales-person/README.md

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@@ -12,15 +12,15 @@
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## 607. Sales Person (Easy)
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<p><b>Description</b></p>
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<p>
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Given three tables: <code>salesperson</code>, <code>company</code>, <code>orders</code>.</br>
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Output all the <b>names</b> in the table <code>salesperson</code>, who didn’t have sales to company 'RED'.
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<p>
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<b>Example</b><br />
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<b>Input</b>
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<p>
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Table: <code>salesperson</code>
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</p>
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<p>Given three tables: <code>salesperson</code>, <code>company</code>, <code>orders</code>.<br />
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Output all the <b>names</b> in the table <code>salesperson</code>, who didn&rsquo;t have sales to company &#39;RED&#39;.</p>
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<p><b>Example</b><br />
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<b>Input</b></p>
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<p>Table: <code>salesperson</code></p>
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<pre>
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+----------+------+--------+-----------------+-----------+
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| sales_id | name | salary | commission_rate | hire_date |
@@ -32,10 +32,10 @@ Table: <code>salesperson</code>
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| 5 | Alex | 50000 | 10 | 2/3/2007 |
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+----------+------+--------+-----------------+-----------+
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</pre>
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The table <code>salesperson</code> holds the salesperson information. Every salesperson has a <b>sales_id</b> and a <b>name</b>.</br>
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<p>
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Table: <code>company</code>
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</p>
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The table <code>salesperson</code> holds the salesperson information. Every salesperson has a <b>sales_id</b> and a <b>name</b>.
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<p>Table: <code>company</code></p>
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<pre>
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+---------+--------+------------+
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| com_id | name | city |
@@ -46,25 +46,24 @@ Table: <code>company</code>
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| 4 | GREEN | Austin |
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+---------+--------+------------+
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</pre>
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The table <code>company</code> holds the company information. Every company has a <b>com_id</b> and a <b>name</b>.</br>
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<p>
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Table: <code>orders</code>
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</p>
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The table <code>company</code> holds the company information. Every company has a <b>com_id</b> and a <b>name</b>.
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<p>Table: <code>orders</code></p>
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<pre>
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+----------+----------+---------+----------+--------+
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| order_id | date | com_id | sales_id | amount |
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+----------+----------+---------+----------+--------+
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| 1 | 1/1/2014 | 3 | 4 | 100000 |
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| 2 | 2/1/2014 | 4 | 5 | 5000 |
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| 3 | 3/1/2014 | 1 | 1 | 50000 |
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| 4 | 4/1/2014 | 1 | 4 | 25000 |
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+----------+------------+---------+----------+--------+
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| order_id | order_date | com_id | sales_id | amount |
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+----------+------------+---------+----------+--------+
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| 1 | 1/1/2014 | 3 | 4 | 100000 |
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| 2 | 2/1/2014 | 4 | 5 | 5000 |
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| 3 | 3/1/2014 | 1 | 1 | 50000 |
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| 4 | 4/1/2014 | 1 | 4 | 25000 |
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+----------+----------+---------+----------+--------+
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</pre>
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The table <code>orders</code> holds the sales record information, salesperson and customer company are represented by <b>sales_id</b> and <b>com_id</b>.</br>
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The table <code>orders</code> holds the sales record information, salesperson and customer company are represented by <b>sales_id</b> and <b>com_id</b>.
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<p><b>output</b></p>
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<p>
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<b>output</b>
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</p>
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<pre>
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+------+
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| name |
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| Alex |
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+------+
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</pre>
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<p>
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<b>Explanation</b>
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<p>
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According to order '3' and '4' in table <code>orders</code>, it is easy to tell only salesperson 'John' and 'Alex' have sales to company 'RED',</br>so we need to output all the other <b>names</b> in table <code>salesperson</code>.
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</p>
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<p><b>Explanation</b></p>
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<p>According to order &#39;3&#39; and &#39;4&#39; in table <code>orders</code>, it is easy to tell only salesperson &#39;John&#39; and &#39;Alex&#39; have sales to company &#39;RED&#39;,<br />
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so we need to output all the other <b>names</b> in table <code>salesperson</code>.</p>
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### Hints
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<details>

‎problems/sales-person/mysql_schemas.sql

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Original file line numberDiff line numberDiff line change
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Create table If Not Exists salesperson (sales_id int, name varchar(255), salary int,commission_rate int, hire_date varchar(255));
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Create table If Not Exists company (com_id int, name varchar(255), city varchar(255));
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Create table If Not Exists orders (order_id int, date varchar(255), com_id int, sales_id int, amount int);
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Create table If Not Exists orders (order_id int, order_date varchar(255), com_id int, sales_id int, amount int);
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Truncate table salesperson;
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insert into salesperson (sales_id, name, salary, commission_rate, hire_date) values ('1', 'John', '100000', '6', '4/1/2006');
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insert into salesperson (sales_id, name, salary, commission_rate, hire_date) values ('2', 'Amy', '12000', '5', '5/1/2010');
@@ -13,7 +13,7 @@ insert into company (com_id, name, city) values ('2', 'ORANGE', 'New York');
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insert into company (com_id, name, city) values ('3', 'YELLOW', 'Boston');
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insert into company (com_id, name, city) values ('4', 'GREEN', 'Austin');
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Truncate table orders;
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insert into orders (order_id, date, com_id, sales_id, amount) values ('1', '1/1/2014', '3', '4', '10000');
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insert into orders (order_id, date, com_id, sales_id, amount) values ('2', '2/1/2014', '4', '5', '5000');
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insert into orders (order_id, date, com_id, sales_id, amount) values ('3', '3/1/2014', '1', '1', '50000');
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insert into orders (order_id, date, com_id, sales_id, amount) values ('4', '4/1/2014', '1', '4', '25000');
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insert into orders (order_id, order_date, com_id, sales_id, amount) values ('1', '1/1/2014', '3', '4', '10000');
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insert into orders (order_id, order_date, com_id, sales_id, amount) values ('2', '2/1/2014', '4', '5', '5000');
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insert into orders (order_id, order_date, com_id, sales_id, amount) values ('3', '3/1/2014', '1', '1', '50000');
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insert into orders (order_id, order_date, com_id, sales_id, amount) values ('4', '4/1/2014', '1', '4', '25000');

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