6lab_DONE!

Lab/Lab#6/insert.sql

@@ -1,4 +1,4 @@
-DROP TABLE bd6_employees IF EXISTS;
+DROP TABLE IF EXISTS bd6_employees;
 
 -- CREATE TABLE bd6_departments(
 --   id integer PRIMARY KEY,

Lab/Lab#6/lab6.sql

@@ -0,0 +1,49 @@
+CREATE OR REPLACE PROCEDURE update_salary() AS $$
+DECLARE
+   emp_record bd6_employees%ROWTYPE;
+   counter integer := 0;
+   min_salary bd6_employees.salary_in_euro%TYPE;
+   max_salary bd6_employees.salary_in_euro%TYPE;
+BEGIN
+  -- SELECT MIN(salary_in_euro), MAX(salary_in_euro) INTO min_salary, max_salary FROM bd6_employees;
+   
+   FOR emp_record IN
+   SELECT * FROM (SELECT * FROM bd6_employees ORDER BY salary_in_euro LIMIT 3) AS min_salaries
+   LOOP
+      DELETE FROM bd6_employees WHERE id = emp_record.id;
+      counter := counter + 1;
+   END LOOP;
+   FOR emp_record IN
+   SELECT * FROM (SELECT * FROM bd6_employees ORDER BY salary_in_euro DESC LIMIT 3) AS max_salaries
+   LOOP
+      UPDATE bd6_employees SET salary_in_euro = salary_in_euro + min_salary WHERE id = emp_record.id;
+      counter := counter + 1;
+   END LOOP;
+   
+   RAISE NOTICE 'Successfully updated % bd6_employees.', counter;
+END $$ LANGUAGE plpgsql;
+CALL update_salary();
+
+CREATE OR REPLACE PROCEDURE update_and_delete_salaries() AS $$
+BEGIN
+    -- Увеличение заработной платы
+    WITH lowest_salaries AS (
+        SELECT id, salary_in_euro
+        FROM bd6_employees
+        ORDER BY salary_in_euro
+        LIMIT 10
+    ), highest_salary AS (
+        SELECT max(salary_in_euro) AS max_salary
+        FROM bd6_employees
+    )
+    UPDATE bd6_employees e
+    SET salary_in_euro = e.salary_in_euro + ls.salary_in_euro - (SELECT max_salary FROM highest_salary)
+    FROM lowest_salaries ls
+    WHERE e.id = ls.id;
+
+    -- Удаление сотрудников
+    DELETE FROM bd6_employees WHERE id IN (SELECT id FROM lowest_salaries);
+
+    RAISE NOTICE 'Salaries updated and lowest paid bd6_employees deleted.';
+END;
+$$ LANGUAGE plpgsql;

Lab/Lab#6/lab6_done.sql

@@ -50,6 +50,7 @@ FOR employee_rec IN (
    SELECT last_name, first_name, salary_in_euro 
    FROM bd6_employees 
    ORDER BY salary_in_euro) 
+
 LOOP
    current_salary := employee_rec.salary_in_euro;
 
@@ -74,32 +75,42 @@ CALL print_employees();
 большой заработной платой. 2-я с конца заработная плата должна добавиться
 к человеку со второй по размеру заработной платой и т.д. */
 
-CREATE OR REPLACE PROCEDURE update_salary() AS $$
+CREATE OR REPLACE FUNCTION rearrange_salaries() RETURNS VOID AS $$
 DECLARE
-   emp_record bd6_employees%ROWTYPE;
+    salaries RECORD;
-   counter integer := 0;
+	small NUMERIC[];
-   min_salary bd6_employees.salary_in_euro%TYPE;
+	larg NUMERIC[];
-   max_salary bd6_employees.salary_in_euro%TYPE;
+	const CONSTANT INTEGER = 10;
 BEGIN
-   SELECT MIN(salary_in_euro), MAX(salary_in_euro) INTO min_salary, max_salary FROM bd6_employees;
+    FOR salaries IN 
-   
+        SELECT id, salary_in_euro
-   FOR emp_record IN
+        FROM bd6_employees 
-   SELECT * FROM (SELECT * FROM bd6_employees ORDER BY salary_in_euro LIMIT 3) AS min_salaries
+        ORDER BY salary_in_euro 
-   LOOP
+        LIMIT const
+	LOOP
+		small = array_append(small, (SELECT salary_in_euro FROM bd6_employees WHERE id = salaries.id));
+    	DELETE FROM bd6_employees
+    	WHERE id = salaries.id;
+	END LOOP;
 
-      DELETE FROM bd6_employees WHERE id = emp_record.id;
+    FOR salaries IN 
-      counter := counter + 1;
+        SELECT id, salary_in_euro
-   END LOOP;
+        FROM bd6_employees 
-   FOR emp_record IN
+        ORDER BY salary_in_euro DESC 
-   SELECT * FROM (SELECT * FROM bd6_employees ORDER BY salary_in_euro DESC LIMIT 3) AS max_salaries
+        LIMIT const
-   LOOP
+	LOOP
-      UPDATE bd6_employees SET salary_in_euro = salary_in_euro + min_salary WHERE id = emp_record.id;
+		larg = array_append(larg, (SELECT id FROM bd6_employees WHERE id = salaries.id));
-      counter := counter + 1;
+	END LOOP;
-   END LOOP;
+	
-   
+	FOR i IN 1..const
-   RAISE NOTICE 'Successfully updated % bd6_employees.', counter;
+	LOOP
-END $$ LANGUAGE plpgsql;
+        UPDATE bd6_employees
-CALL update_salary();
+        SET salary_in_euro = salary_in_euro + small[i]
+        WHERE id = larg[i];
+    END LOOP;
+END;
+$$ LANGUAGE plpgsql;
+SELECT rearrange_salaries();
 
 -- Task 4 --
 /* Создайте таблицу spiral с 5 полями f1, f2, f3, f4, f5 – целые числа.

Lab/Lab#6/test3.sql

@@ -1,26 +1,36 @@
-CREATE OR REPLACE PROCEDURE update_salary() AS $$
+CREATE OR REPLACE FUNCTION rearrange_salaries() RETURNS VOID AS $$
 DECLARE
-   emp_record bd6_employees%ROWTYPE;
+    salaries RECORD;
-   counter integer := 0;
+	small NUMERIC[];
-   min_salary bd6_employees.salary_in_euro%TYPE;
+	larg NUMERIC[];
-   max_salary bd6_employees.salary_in_euro%TYPE;
+	const CONSTANT INTEGER = 10;
 BEGIN
-   SELECT MIN(salary_in_euro), MAX(salary_in_euro) INTO min_salary, max_salary FROM bd6_employees;
+    FOR salaries IN 
-   
+        SELECT id, salary_in_euro
-   FOR emp_record IN
+        FROM bd6_employees 
-   SELECT * FROM (SELECT * FROM bd6_employees ORDER BY salary_in_euro LIMIT 3) AS min_salaries
+        ORDER BY salary_in_euro 
-   LOOP
+        LIMIT const
+	LOOP
+		small = array_append(small, (SELECT salary_in_euro FROM bd6_employees WHERE id = salaries.id));
+    	DELETE FROM bd6_employees
+    	WHERE id = salaries.id;
+	END LOOP;
 
-      DELETE FROM bd6_employees WHERE id = emp_record.id;
+    FOR salaries IN 
-      counter := counter + 1;
+        SELECT id, salary_in_euro
-   END LOOP;
+        FROM bd6_employees 
-   FOR emp_record IN
+        ORDER BY salary_in_euro DESC 
-   SELECT * FROM (SELECT * FROM bd6_employees ORDER BY salary_in_euro DESC LIMIT 3) AS max_salaries
+        LIMIT const
-   LOOP
+	LOOP
-      UPDATE bd6_employees SET salary_in_euro = salary_in_euro + min_salary WHERE id = emp_record.id;
+		larg = array_append(larg, (SELECT id FROM bd6_employees WHERE id = salaries.id));
-      counter := counter + 1;
+	END LOOP;
-   END LOOP;
+	
-   
+	FOR i IN 1..const
-   RAISE NOTICE 'Successfully updated % bd6_employees.', counter;
+	LOOP
-END $$ LANGUAGE plpgsql;
+        UPDATE bd6_employees
-CALL update_salary();
+        SET salary_in_euro = salary_in_euro + small[i]
+        WHERE id = larg[i];
+    END LOOP;
+END;
+$$ LANGUAGE plpgsql;
+SELECT rearrange_salaries();

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');
+