Hasindu's Diary

Callback Function A callback function is a function that you pass into another function , so it can be called later when something happens. Human example: You order food at a restaurant. You tell the waiter: “When my food is ready, call me.” Here, calling you later is like a callback. In programming: function cookFood(callback) { console.log("Cooking food..."); callback(); } function tellCustomer() { console.log("Your food is ready!"); } cookFood(tellCustomer); Output: Cooking food... Your food is ready! Here, tellCustomer is the callback function. Because we pass it into cookFood(tellCustomer) . Then cookFood runs it later using callback(); Another common example: setTimeout(function () { console.log("This runs after 2 seconds"); }, 2000); Here, the function inside set...

  Question You have a table called orders: orders(order_id, user_id, amount, order_date) Write an SQL query to find all users who have placed at least one order greater than the average order amount. Answer SELECT user_id FROM orders WHERE amount > (     SELECT AVG(amount)     FROM orders ); To avoid duplicate users: SELECT DISTINCT user_id FROM orders WHERE amount > (     SELECT AVG(amount)     FROM orders ); Explanation: Inner query calculates the average order amount first, then the outer query finds users with orders above that average.

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