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목록SQL (63)
Milky's note
[HackerRank](E) Revising Aggregations - Averages
https://www.hackerrank.com/challenges/revising-aggregations-the-average-function/problem?isFullScreen=true Revising Aggregations - Averages | HackerRank Query the average population of all cities in the District of California. www.hackerrank.com [문제] Query the average population of all cities in CITY where District is California. Input Format The CITY table is described as follows: [답] -mysql se..
[HackerRank](E) Revising Aggregations - The Sum Function
https://www.hackerrank.com/challenges/revising-aggregations-sum/problem?isFullScreen=true Revising Aggregations - The Sum Function | HackerRank Query the total population of all cities for in the District of California. www.hackerrank.com [문제] Query the total population of all cities in CITY where District is California. Input Format The CITY table is described as follows: [답] - mysql select sum..
[HackerRank](E) Revising Aggregations - The Count Function
https://www.hackerrank.com/challenges/revising-aggregations-the-count-function/problem?isFullScreen=true Revising Aggregations - The Count Function | HackerRank Query the number of cities having populations larger than 100000. www.hackerrank.com [문제] Query a count of the number of cities in CITY having a Population larger than 100,000. Input Format The CITY table is described as follows: [답] -my..
[HackerRank](M) Binary Tree Nodes
https://www.hackerrank.com/challenges/binary-search-tree-1/problem?isFullScreen=true Binary Tree Nodes | HackerRank Write a query to find the node type of BST ordered by the value of the node. www.hackerrank.com [문제] You are given a table, BST, containing two columns: N and P, where N represents the value of a node in Binary Tree, and P is the parent of N. Write a query to find the node type of ..