We use cookies to ensure you have the best browsing experience on our website. Please read our cookie policy for more information about how we use cookies.
think of a select like it's an if statement. If you have 2 or more if's, it takes more time to think. If you join the the table it will do one lookup amongst both tables. Hope this helps !
Cookie support is required to access HackerRank
Seems like cookies are disabled on this browser, please enable them to open this website
Population Census
You are viewing a single comment's thread. Return to all comments →
think of a select like it's an if statement. If you have 2 or more if's, it takes more time to think. If you join the the table it will do one lookup amongst both tables. Hope this helps !