Commit 19226d6

committed

Add a question

1 parent 7b93164 commit 19226d6Copy full SHA for 19226d6

File tree

+51

-0

lines changed

+51

-0

lines changed

Lines changed: 51 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -1506,3 +1506,54 @@ WHERE store3 IS NOT NULL`
`1506`	`1506`	`---`
`1507`	`1507`
`1508`	`1508`	`[⬆ Back to Top](#sql-coding-challenges-for-beginners)`
	`1509`	`+`
	`1510`	`+## 45. Find the Team Size`
	`1511`	`+`
	`1512`	`+Write a SQL query to find the team size of each of the employees. Return result table in any order. Here is an example:`
	`1513`	`+`
	`1514`	+```
	`1515`	`+Employee Table:`
	`1516`	`++-------------+------------+`
	`1517`	`+\| employee_id \| team_id \|`
	`1518`	`++-------------+------------+`
	`1519`	`+\| 1 \| 8 \|`
	`1520`	`+\| 2 \| 8 \|`
	`1521`	`+\| 3 \| 8 \|`
	`1522`	`+\| 4 \| 7 \|`
	`1523`	`+\| 5 \| 9 \|`
	`1524`	`+\| 6 \| 9 \|`
	`1525`	`++-------------+------------+`
	`1526`	+```
	`1527`	`+`
	`1528`	+```
	`1529`	`+Result table:`
	`1530`	`++-------------+------------+`
	`1531`	`+\| employee_id \| team_size \|`
	`1532`	`++-------------+------------+`
	`1533`	`+\| 1 \| 3 \|`
	`1534`	`+\| 2 \| 3 \|`
	`1535`	`+\| 3 \| 3 \|`
	`1536`	`+\| 4 \| 1 \|`
	`1537`	`+\| 5 \| 2 \|`
	`1538`	`+\| 6 \| 2 \|`
	`1539`	`++-------------+------------+`
	`1540`	+```
	`1541`	`+`
	`1542`	`+<details><summary>Solution</summary>`
	`1543`	`+`
	`1544`	+```sql
	`1545`	`+SELECT employee.employee_id, team.team_size`
	`1546`	`+FROM employee`
	`1547`	`+LEFT JOIN (`
	`1548`	`+ SELECT team_id, COUNT(employee_id) AS team_size`
	`1549`	`+ FROM employee`
	`1550`	`+ GROUP BY team_id`
	`1551`	`+) team`
	`1552`	`+ON employee.team_id = team.team_id;`
	`1553`	+```
	`1554`	`+`
	`1555`	`+</details>`
	`1556`	`+`
	`1557`	`+---`
	`1558`	`+`
	`1559`	`+[⬆ Back to Top](#sql-coding-challenges-for-beginners)`

Comments

(0)