4 ms·

For this example, nothing. It would be useful where neither of the two SELECT queries is a subset/superset of the other. (Not saying you didn't know that.)

• 3rd3 3y ago
  Could you give an example?
  • ako 3y ago
    This will be useful if you have a table with some related history records, e.g., products with product price history, and you want to get the latest price. The lateral join would get all prices for the current product, sort them by date and then pick the top row.
    • 3rd3 3y ago
      How does a lateral (cross) join compare to a window function in your example?
    • ses1984 3y ago
      Is a lateral join more efficient than just saying where product = current sort by date desc ?