rebased 1.0

Lab/Lab#2/var2.sql

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+/* Лабораторная работа #2 || Вариант 2 || Антипенко, Дробышевский */
+
+/* Задание 1 */
+SELECT 
+    (first_name || ' ' || last_name) AS "ФИО",
+    salary AS "ОКЛАД",
+    trunc(salary*0.87) AS "Оклад минус подоходный"
+FROM employees;
+
+/* Задание 2 */
+SELECT 
+    first_name AS "Имя",
+    last_name AS "Фамилия",
+    job_id AS "Должность", 
+    hire_date AS "Дата приема на работу"
+FROM employees
+WHERE job_id IN ('AD_PRES', 'AD_VP', 'AD_ASST')
+AND hire_date BETWEEN SYMMETRIC
+'1995-01-01' AND '2023-01-01'
+LIMIT 5;
+
+/* Задание 3 */
+SELECT 
+	first_name AS "Имя",
+	last_name AS "Фамилия",
+	job_id AS "Должность", 
+	to_char(hire_date, 'DD.MM.YYYY') AS "Дата приема на работу",
+
+	EXTRACT(month from now()) + EXTRACT(year from now())*12
+	- EXTRACT(month from hire_date) - EXTRACT(year from hire_date)*12
+	as "Проработано месяцев"
+
+FROM employees;
+
+/* Задание 4 */
+SELECT 
+	job_id AS "Должность",
+	trunc(MAX(salary)) AS "Максимальная зарплата",
+	trunc(MIN(salary)) AS "Минимальная зарплата",
+	trunc(AVG(salary), 2) AS "Средняя зарплата" 
+
+FROM employees 
+GROUP BY job_id;