このレッスンは、現在英語のみです。
Trees and top N
You invited friends, and they invited theirs: that is a tree. Recursive queries walk trees like that in one statement, and LATERAL answers "the top three for each" without any application loops.
このレッスンは、現在英語のみです。
You invited friends, and they invited theirs: that is a tree. Recursive queries walk trees like that in one statement, and LATERAL answers "the top three for each" without any application loops.