add 1303

Author: fishercoder1534

README.md

@@ -887,6 +887,7 @@ _If you like this project, please leave me a star._ ★
 |1327|[List the Products Ordered in a Period](https://leetcode.com/problems/list-the-products-ordered-in-a-period/)|[Solution](../master/database/_1327.sql) || Easy |
 |1322|[Ads Performance](https://leetcode.com/problems/ads-performance/)|[Solution](../master/database/_1322.sql) || Easy |
 |1308|[Running Total for Different Genders](https://leetcode.com/problems/running-total-for-different-genders/)|[Solution](../master/database/_1308.sql) || Medium |
+|1303|[Find the Team Size](https://leetcode.com/problems/find-the-team-size/)|[Solution](../master/database/_1303.sql) || Easy |
 |1294|[Weather Type in Each Country](https://leetcode.com/problems/weather-type-in-each-country/)|[Solution](../master/database/_1294.sql) | | Easy |
 |1280|[Students and Examinations](https://leetcode.com/problems/students-and-examinations/)|[Solution](../master/database/_1280.sql) | [:tv:](https://www.youtube.com/watch?v=ThbkV4Fs7iE)| Easy |
 |1270|[All People Report to the Given Manager](https://leetcode.com/problems/all-people-report-to-the-given-manager/)|[Solution](../master/database/_1270.sql) || Medium |

database/_1303.sql

@@ -0,0 +1,51 @@
+--1303. Find the Team Size
+--
+--Table: Employee
+--
+--+---------------+---------+
+--| Column Name   | Type    |
+--+---------------+---------+
+--| employee_id   | int     |
+--| team_id       | int     |
+--+---------------+---------+
+--employee_id is the primary key for this table.
+--Each row of this table contains the ID of each employee and their respective team.
+--Write an SQL query to find the team size of each of the employees.
+--
+--Return result table in any order.
+--
+--The query result format is in the following example:
+--
+--Employee Table:
+--+-------------+------------+
+--| employee_id | team_id    |
+--+-------------+------------+
+--|     1       |     8      |
+--|     2       |     8      |
+--|     3       |     8      |
+--|     4       |     7      |
+--|     5       |     9      |
+--|     6       |     9      |
+--+-------------+------------+
+--Result table:
+--+-------------+------------+
+--| employee_id | team_size  |
+--+-------------+------------+
+--|     1       |     3      |
+--|     2       |     3      |
+--|     3       |     3      |
+--|     4       |     1      |
+--|     5       |     2      |
+--|     6       |     2      |
+--+-------------+------------+
+--Employees with Id 1,2,3 are part of a team with team_id = 8.
+--Employees with Id 4 is part of a team with team_id = 7.
+--Employees with Id 5,6 are part of a team with team_id = 9.
+
+--# Write your MySQL query statement below
+select employee_id, team_size from Employee e
+left join
+(
+select team_id, count(distinct(employee_id)) as team_size from Employee group by team_id
+) as t
+on e.team_id = t.team_id;