Zurab Mdivani _ SExI System SQL

calculate_largest_expensors.sql

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+-- Report employees who have expensed more than 1000
+-- Shows employee details, their manager, and total expenses in descending order
+
+SELECT 
+    e.employee_id,
+    e.first_name || ' ' || e.last_name as employee_name,
+    e.manager_id,
+    m.first_name || ' ' || m.last_name as manager_name,
+    SUM(ex.unit_price * ex.quantity) as total_expensed_amount
+FROM memory.default.EMPLOYEE e
+INNER JOIN memory.default.EXPENSE ex ON e.employee_id = ex.employee_id
+LEFT JOIN memory.default.EMPLOYEE m ON e.manager_id = m.employee_id
+GROUP BY 
+    e.employee_id, 
+    e.first_name, 
+    e.last_name, 
+    e.manager_id,
+    m.first_name,
+    m.last_name
+HAVING SUM(ex.unit_price * ex.quantity) > 1000
+ORDER BY total_expensed_amount DESC;

create_employees.sql

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+-- Create EMPLOYEE table for SExI system
+CREATE TABLE IF NOT EXISTS memory.default.EMPLOYEE (
+    employee_id TINYINT,
+    first_name VARCHAR,
+    last_name VARCHAR,
+    manager_id TINYINT
+);
+
+-- Insert all employee data from hr/employee_index.csv
+INSERT INTO memory.default.EMPLOYEE (employee_id, first_name, last_name, manager_id) VALUES (1, 'Ian', 'James', 4);
+INSERT INTO memory.default.EMPLOYEE (employee_id, first_name, last_name, manager_id) VALUES (2, 'Umberto', 'Torrielli', 1);
+INSERT INTO memory.default.EMPLOYEE (employee_id, first_name, last_name, manager_id) VALUES (3, 'Alex', 'Jacobson', 2);
+INSERT INTO memory.default.EMPLOYEE (employee_id, first_name, last_name, manager_id) VALUES (4, 'Darren', 'Poynton', 2);
+INSERT INTO memory.default.EMPLOYEE (employee_id, first_name, last_name, manager_id) VALUES (5, 'Tim', 'Beard', 2);
+INSERT INTO memory.default.EMPLOYEE (employee_id, first_name, last_name, manager_id) VALUES (6, 'Gemma', 'Dodd', 1);
+INSERT INTO memory.default.EMPLOYEE (employee_id, first_name, last_name, manager_id) VALUES (7, 'Lisa', 'Platten', 6);
+INSERT INTO memory.default.EMPLOYEE (employee_id, first_name, last_name, manager_id) VALUES (8, 'Stefano', 'Camisaca', 2);
+INSERT INTO memory.default.EMPLOYEE (employee_id, first_name, last_name, manager_id) VALUES (9, 'Andrea', 'Ghibaudi', 2);

create_expenses.sql

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+-- Create EXPENSE table for SExI system
+CREATE TABLE IF NOT EXISTS memory.default.EXPENSE (
+    employee_id TINYINT,
+    unit_price DECIMAL(8, 2),
+    quantity TINYINT
+);
+
+-- Insert expense data from finance/receipts_from_last_night directory
+
+-- drinkies.txt - Alex Jacobson
+INSERT INTO memory.default.EXPENSE (employee_id, unit_price, quantity) VALUES (3, 6.50, 14);
+
+-- drinks.txt - Alex Jacobson
+INSERT INTO memory.default.EXPENSE (employee_id, unit_price, quantity) VALUES (3, 11.00, 20);
+
+-- drinkss.txt - Alex Jacobson
+INSERT INTO memory.default.EXPENSE (employee_id, unit_price, quantity) VALUES (3, 22.00, 18);
+
+-- duh_i_think_i_got_too_many.txt - Alex Jacobson
+INSERT INTO memory.default.EXPENSE (employee_id, unit_price, quantity) VALUES (3, 13.00, 75);
+
+-- i_got_lost_on_the_way_home_and_now_im_in_mexico.txt - Andrea Ghibaudi
+INSERT INTO memory.default.EXPENSE (employee_id, unit_price, quantity) VALUES (9, 300.00, 1);
+
+-- ubers.txt - Darren Poynton
+INSERT INTO memory.default.EXPENSE (employee_id, unit_price, quantity) VALUES (4, 40.00, 9);
+
+-- we_stopped_for_a_kebabs.txt - Umberto Torrielli
+INSERT INTO memory.default.EXPENSE (employee_id, unit_price, quantity) VALUES (2, 17.50, 4);

find_manager_cycles.sql

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+-- Find cycles in employee-manager relationships
+-- Detects circular approval chains where employees approve each other's expenses
+
+WITH RECURSIVE manager_chain (employee_id, manager_id, chain, start_employee, depth) AS (
+    SELECT 
+        employee_id,
+        manager_id,
+        CAST(employee_id AS VARCHAR),
+        employee_id,
+        1
+    FROM memory.default.EMPLOYEE
+    WHERE manager_id IS NOT NULL
+
+    UNION ALL
+
+    SELECT 
+        e.employee_id,
+        e.manager_id,
+        mc.chain || ',' || CAST(e.employee_id AS VARCHAR),
+        mc.start_employee,
+        mc.depth + 1
+    FROM memory.default.EMPLOYEE e
+    INNER JOIN manager_chain mc ON e.employee_id = mc.manager_id
+    WHERE e.manager_id IS NOT NULL
+        AND mc.depth < 20
+        AND POSITION(CAST(e.employee_id AS VARCHAR) IN mc.chain) = 0
+)
+SELECT DISTINCT
+    start_employee as employee_id,
+    chain || ',' || CAST(manager_id AS VARCHAR) as cycle
+FROM manager_chain
+WHERE manager_id = start_employee
+ORDER BY employee_id;

generate_supplier_payment_plans.sql

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+-- Generate monthly payment plan for suppliers
+-- Creates a payment schedule showing monthly payments to fully pay invoices before due dates
+
+WITH supplier_totals AS (
+    -- Calculate total owed per supplier and months until furthest due date
+    SELECT 
+        s.supplier_id,
+        s.name as supplier_name,
+        SUM(i.invoice_ammount) as total_owed,
+        MAX(i.due_date) as final_due_date,
+        CAST(MONTH(MAX(i.due_date)) - MONTH(CURRENT_DATE) + 
+             (YEAR(MAX(i.due_date)) - YEAR(CURRENT_DATE)) * 12 AS INTEGER) as months_to_pay
+    FROM memory.default.SUPPLIER s
+    INNER JOIN memory.default.INVOICE i ON s.supplier_id = i.supplier_id
+    GROUP BY s.supplier_id, s.name
+),
+payment_months AS (
+    -- Generate sequence of payment months for each supplier
+    SELECT 
+        supplier_id,
+        supplier_name,
+        total_owed,
+        months_to_pay,
+        month_num
+    FROM supplier_totals
+    CROSS JOIN UNNEST(SEQUENCE(1, GREATEST(months_to_pay, 1))) AS t(month_num)
+),
+payments AS (
+    -- Calculate payment amount and balance for each month
+    SELECT 
+        supplier_id,
+        supplier_name,
+        CASE 
+            WHEN month_num < months_to_pay THEN ROUND(total_owed / months_to_pay, 2)
+            ELSE total_owed - (ROUND(total_owed / months_to_pay, 2) * (months_to_pay - 1))
+        END as payment_amount,
+        total_owed - (ROUND(total_owed / months_to_pay, 2) * (month_num - 1)) as balance_before,
+        month_num,
+        LAST_DAY_OF_MONTH(DATE_ADD('month', month_num - 1, CURRENT_DATE)) as payment_date_actual
+    FROM payment_months
+)
+SELECT 
+    supplier_id,
+    supplier_name,
+    payment_amount,
+    balance_before - payment_amount as balance_outstanding,
+    CASE 
+        WHEN month_num = 1 THEN 'End of this month'
+        WHEN month_num = 2 THEN 'End of next month'
+        ELSE 'End of the month after'
+    END as payment_date
+FROM payments
+ORDER BY supplier_id, month_num;