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Refactor SQL queries to include GROUP BY and counts #102

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Refactor SQL queries to include GROUP BY and counts #102

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18 changes: 13 additions & 5 deletions SQL Deep Dive/Group By/questions.sql
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Original file line number Diff line number Diff line change
Expand Up @@ -4,22 +4,30 @@
* Table: Employees
*/

SELECT e.emp_no
FROM employees as e
SELECT hire_date, count(emp_no)
FROM employees GROUP BY hire_date
ORDER BY "amount" asc;l

/*
* Show me all the employees, hired after 1991 and count the amount of positions they've had
* Database: Employees
*/

SELECT e.emp_no
FROM employees as e
SELECT e.emp_no, count(t.titles) as "Amount of titles"
FROM employees as e JOIN titles as t USING(emp_no)
WHERE EXTRACT (YEAR FROM e.hire_date) > 1991
GROUP BY e.emp_no
ORDER BY e.emp_no;


/*
* Show me all the employees that work in the department development and the from and to date.
* Database: Employees
*/

SELECT e.emp_no
SELECT e.emp_no, de.from_date, de.to_date
FROM employees as e
JOIN dept_emp as de USING(emp_no)
WHERE de.dept_no = 'd005'
GROUP BY e.emp_no, de.from_date, de.to_date
ORDER BY e.emp_no, de.to_date;