Скачать или смотреть (SQL Tutorial #13) HAVING clause with GROUP BY (HAVING clause VS. WHERE clause)

(SQL Tutorial #13) HAVING clause with GROUP BY (HAVING clause VS. WHERE clause)

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Описание к видео (SQL Tutorial #13) HAVING clause with GROUP BY (HAVING clause VS. WHERE clause)

Learn how to use HAVING clause with GROUP BY in SQL. Also, learn the difference between HAVING clause and WHERE clause.

► The HAVING clause was added to SQL because the WHERE keyword could not be used with aggregate functions.

► Queries used in this video:
1. SELECT * FROM hr.employees;
2. Show number of employee_id, department_id for each department where number of employee_ids is more than 3. Sort in ascending order.
SELECT COUNT(employee_id), department_id
FROM hr.employees GROUP BY department_id
WHERE COUNT(employee_id) ▶️ 3 ORDER BY COUNT(employee_id) ASC;
VS.
SELECT COUNT(employee_id), department_id
FROM hr.employees GROUP BY department_id
HAVING COUNT(employee_id) ▶️ 3 ORDER BY COUNT(employee_id) ASC;
3. Show all job_id and average salary who work as any of these jobs IT_PROG, SA_REP, FI_ACCOUNT, AD_VP
select job_id, avg(salary) as "average salary" from hr.employees group by job_id
having job_id IN ('IT_PROG', 'SA_REP', 'FI_ACCOUNT', 'AD_VP');
**▶️ means greater than & ◀️ means less than**

► This video is a part of SQL for Beginners Tutorial series.
► See the PLAYLIST to learn more about SQL commands: • SQL Quick Tutorials for Beginners [Best St...

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HAVING clause with GROUP BY | Difference between HAVING clause and WHERE clause |
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