SQL is still the connective tissue of every modern data stack—from cloud warehouses to mobile apps. Recruiters know it, too: employer demand for SQL skills grew 46% year-over-year, according to labour ...

created_at TIMESTAMP NOT NULL DEFAULT NOW(), updated_at TIMESTAMP NOT NULL DEFAULT NOW() -- Indexes for efficient lookups CREATE INDEX idx_pdf_conversions_path ON debug.pdf_conversions(pdf_path); ...

select customer_id,count(order_id) as total_orders, sum(amount) as total_spend from orders group by customer_id having count(order_id) >=3 select name, price, case ...