reboot rep

3 sem/Practice/27_11.sql

@@ -0,0 +1,104 @@
+-- Task 1 --
+
+CREATE OR REPLACE PROCEDURE molodec() AS $$
+DECLARE 
+    name1 varchar := 'Julia';
+    name2 varchar := 'Пустотааа';
+BEGIN
+    RAISE INFO ' %, %, вы молодцы! ', name1, name2;
+
+END $$ LANGUAGE plpgsql; 
+CALL molodec();
+
+-- Task 2 -- 
+
+CREATE OR REPLACE PROCEDURE fiiiizika() AS $$
+DECLARE
+    velocity_kmh NUMERIC := 60; 
+    time_seconds NUMERIC := 30; 
+    velocity_ms NUMERIC;
+    distance_m NUMERIC; 
+    train_length_m NUMERIC; 
+BEGIN
+
+    velocity_ms := velocity_kmh * 1000 / 3600;
+
+    distance_m := velocity_ms * time_seconds;
+    train_length_m := distance_m;
+
+    RAISE INFO ' % ', TRUNC(train_length_m);
+END;
+$$ LANGUAGE plpgsql;
+CALL fiiiizika();
+
+
+
+-- Task 3 -- 
+
+CREATE OR REPLACE PROCEDURE show_city_streets() AS $$
+DECLARE
+    city_record RECORD;
+BEGIN
+    FOR city_record IN SELECT city, street_address FROM locations
+	LOOP
+        RAISE NOTICE 'В городе % есть улица %',
+		city_record.city, city_record.street_address;
+    END LOOP;
+END;
+$$ LANGUAGE plpgsql;
+
+CALL show_city_streets();
+
+
+-- Task 4 --
+
+CREATE OR REPLACE PROCEDURE factorial(n INTEGER) AS $$
+DECLARE
+    result INTEGER := 1;
+    i INTEGER := 1;
+BEGIN
+    WHILE i <= n LOOP
+        result := result * i;
+        i := i + 1;
+    END LOOP;
+    RAISE INFO ' % ', result;
+END;
+$$ LANGUAGE plpgsql;
+
+CALL factorial(10);
+
+-- Task 5 -- 
+
+CREATE OR REPLACE FUNCTION get_employees_and_managers_names() 
+RETURNS TABLE (employee_name TEXT, manager_name TEXT) AS $$ 
+BEGIN 
+    RETURN QUERY  
+    SELECT e.first_name || ' ' || e.last_name AS employee_name,  
+           COALESCE(m.first_name || ' ' || m.last_name, 'No manager') AS manager_name 
+    FROM employees e 
+    LEFT JOIN employees m ON e.manager_id = m.employee_id; 
+END; 
+$$ LANGUAGE plpgsql;
+
+SELECT get_employees_and_managers_names();
+
+-- Task 6 -- 
+
+CREATE OR REPLACE FUNCTION binary_to_decimal(binary_num VARCHAR)
+RETURNS NUMERIC AS $$
+DECLARE
+    decimal_num NUMERIC := 0;
+    power NUMERIC := 0;
+    bit NUMERIC;
+BEGIN
+    FOR i IN REVERSE 1..LENGTH(binary_num) LOOP
+        bit := CAST(SUBSTRING(binary_num FROM i FOR 1) AS NUMERIC);
+        decimal_num := decimal_num + (bit * (2 ^ power));
+        power := power + 1;
+    END LOOP;
+    RETURN decimal_num;
+END;
+$$ LANGUAGE plpgsql;
+
+SELECT binary_to_decimal('101');
+

3 sem/Practice/SR/var1.sql

@@ -0,0 +1 @@
+SELECT name FROM departments

3 sem/Practice/prac1.sql

@@ -0,0 +1,32 @@
+DROP TABLE IF EXISTS professors;
+
+CREATE table professors(
+    id integer PRIMARY KEY,
+    first_name varchar(20) NOT NULL,
+    last_name varchar(20) NOT NULL,
+    sec_name varchar(20),
+    salary integer CHECK(salary <= 900000) NOT NULL,
+    subj varchar(20) default 'Общая практика',
+    work_exp integer CHECK(work_exp >= 0),
+    dep varchar(2)
+);
+
+INSERT into professors VALUES 
+(1, 'Rob', 'Ivanov', 'Ivanovich', 34000, default, 3, '75'),
+(2, 'Vasiliy', 'Vasilyev', 'Vasilyevich', 874000, 'TMP', 12, 42),
+(3, 'Сергей', 'Егоров', 'Артемьевич', 37879, default, 2, 33),
+(4, 'Егор', 'Медведев', 'Кириллович', 34000, default, 3, '75'),
+(5, 'Андрей', 'Смирнов', ' Александрович', 554000, 'TMP', 6, 72),
+(6, 'Андрей', 'Егоров', 'Артемьевич', 37879, default, 2, 83),
+(7, 'Rob', 'Ivanov', 'Ivanovich', 34000, default, 6, '75'),
+(8, 'Vasiliy', 'Vasilyev', 'Vasilyevich', 874000, 'TMP', 12, 49),
+(9, 'Петр', 'Сергеев', 'Артемьевич', 349583, default, 3, 43),
+(10, 'Егор', 'Вакутагин', 'Артемьевич', 35669, default, 2, 33);
+
+
+/*SELECT last_name, first_name FROM professors;*/
+SELECT first_name, last_name AS last_name, first_name FROM professors;
+
+DROP table professors;
+
+SELECT * FROM professors;

3 sem/Practice/prac2.sql

@@ -0,0 +1,30 @@
+CREATE table students(
+  id integer primary key,
+  f_name varchar(20) NOT NULL,
+  l_name varchar(20) NOT NULL,
+  age integer CHECK(age >= 18) NOT NULL,
+  grp char(7) NOT NULL,
+  code_spec char(8)
+);
+
+INSERT into students VALUES 
+(1, 'Vasya', 'Pupkin', 20, 'C21-712', '10.05.04'),
+(2, 'Vasya', 'Pupkin', 20, 'C21-712', '10.05.04'),
+(3, 'Ivan', 'Ivanov', 30, 'A12-456', '15.06.11'),
+(4, 'Sasha', 'Smirnova', 19, 'C12-987', '11.07.08'),
+(5, 'Natasha', 'Nikitina', 28, 'D21-654', '03.03.10'),
+(6, 'Nikita', 'Orlov', 23, 'E11-345', '19.08.05'),
+(7, 'Olga', 'Petrova', 22, 'F22-876', '22.05.12'),
+(8, 'Elena', 'Efimova', 33, 'G11-234', '13.09.01');
+
+/*SELECT f_name AS l_name, l_name AS f_name, age AS grp, grp AS age,code_spec
+FROM students;*/
+
+ALTER TABLE students ADD gender char(1);
+
+ALTER TABLE students ADD CONSTRAINT gender SET UNIQUE;
+
+INSERT into students VALUES 
+(1, 'Vasya', 'Pupkin', 20, 'C21-712', '10.05.04', 'm');
+
+SELECT * FROM students;