PR : Shubham Asabe

calculate_largest_expensors.sql

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+select e.employee_id,e.first_name || ' ' || e.last_name as employee_id
+,m.manager_id,
+m.first_name || ' ' || m.last_name as manager_name
+
+ from EMPLOYEE e
+left join 
+(select employee_id,sum(unit_price*quantity) as total_expensed_amount from EXPENSE group by 1)ex
+on e.employee_id=ex.employee_id
+left join 
+EMPLOYEE m
+on m.employee_id=e.manager_id
+where total_expensed_amount>1000

create_employees.sql

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+CREATE TABLE EMPLOYEE (
+	employee_id tinyint,
+	first_name varchar,
+	last_name varchar,
+	job_title varchar,
+	manager_id tinyint
+);
+
+INSERT INTO EMPLOYEE (
+	employee_id,
+	first_name,
+	last_name,
+	job_title,
+	manager_id
+) VALUES
+(1, 'Ian', 'James', 'CEO', 4),
+(2, 'Umberto', 'Torrielli', 'CSO', 1),
+(3, 'Alex', 'Jacobson', 'MD EMEA', 2),
+(4, 'Darren', 'Poynton', 'CFO', 2),
+(5, 'Tim', 'Beard', 'MD APAC', 2),
+(6, 'Gemma', 'Dodd', 'COS', 1),
+(7, 'Lisa', 'Platten', 'CHR', 6),
+(8, 'Stefano', 'Camisaca', 'GM Activation', 2),
+(9, 'Andrea', 'Ghibaudi', 'MD NAM', 2);

create_expenses.sql

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+CREATE TABLE temp_emp (
+	Employee_name varchar,
+	price DECIMAL(8, 2),
+	qty tinyint
+);
+
+
+INSERT INTO temp_emp (
+	Employee_name,
+	price,
+	qty
+) VALUES
+('Alex Jacobson', 6.50, 14),
+('Alex Jacobson', 11.00, 20),
+('Alex Jacobson', 2.00, 18),
+('Alex Jacobson', 13.00, 75),
+('Andrea Ghibaudi', 300, 1),
+('Darren Poynton', 40.00, 9),
+('Umberto Torrielli', 17.50, 4);
+
+create table EXPENSE as select e.employee_id,price as unit_price,qty as quantity from temp_emp ex left outer join 
+EMPLOYEE e on ex.Employee_name=e.first_name || ' ' || e.last_name;
+drop table temp_emp;

create_invoices.sql

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+create table INVOICE
+(supplier_id TINYINT,
+    invoice_ammount DECIMAL(8, 2),
+    due_date DATE);
+
+create table SUPPLIER
+(supplier_id TINYINT,
+name VARCHAR);
+
+INSERT INTO INVOICE (
+	supplier_id,
+	invoice_ammount,
+	due_date
+) VALUES
+(5, 6000, '2025-12-31'),
+(1, 2000, '2025-11-30'),
+(1, 1500, '2025-12-31'),
+(2, 500, '2025-10-31'),
+(3,  6000, '2025-12-31'),
+(4,  4000, '2026-03-31');
+
+INSERT INTO SUPPLIER (
+	supplier_id,
+	name
+) VALUES
+(5, 'Party Animals'),
+(1, 'Catering Plus'),
+(2, 'Dave''s Discos'),
+(3, 'Entertainment tonight'),
+(4, 'Ice Ice Baby');

find_manager_cycles.sql

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+select employee_id,array_agg(manager_id) as in_loop from EMPLOYEE  group by 1

generate_supplier_payment_plans.sql

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+select 
+i.supplier_id,s.name as  supplier_name, sum(invoice_ammount) as payment_amount, sum(invoice_ammount) over(partition by i.supplier_id) as  balance_outstanding,due_date as payment_date
+
+from INVOICE i 
+left outer join 
+SUPPLIER s
+on i.supplier_id=s.supplier_id
+group by 1,2,due_date