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[hackerrank] Prepare > SQL > Aggregation > Weather Observation Station 20 [문제] A median is defined as a number separating the higher half of a data set from the lower half. Query the median of the Northern Latitudes (LAT_N) from STATION and round your answer to decimal places. Input Format The STATION table is described as follows: where LAT_N is the northern latitude and LONG_W is the western l..

[hackerrank] Prepare > SQL > Aggregation > Revising Aggregations - The Count Function [문제] Query a count of the number of cities in CITY having a Population larger than . Input Format The CITY table is described as follows: [MYSQL] [ORCALE] select count(*) from city where population > 100000;

[hackerrank] Prepare > SQL > Advanced Select > New Companies [문제] Amber's conglomerate corporation just acquired some new companies. Each of the companies follows this hierarchy: Given the table schemas below, write a query to print the company_code, founder name, total number of lead managers, total number of senior managers, total number of managers, and total number of employees. Order your o..

[hackerrank] Prepare > SQL > Advanced Select > Binary Tree Nodes [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 Binary Tree ordered by the value of the node. Output one of the following for each node: Root: If node is root node. Leaf: If node is leaf node. In..

[hackerrank] Prepare > SQL > Advanced Select > The PADS [문제] Generate the following two result sets: Query an alphabetically ordered list of all names in OCCUPATIONS, immediately followed by the first letter of each profession as a parenthetical (i.e.: enclosed in parentheses). For example: AnActorName(A), ADoctorName(D), AProfessorName(P), and ASingerName(S). Query the number of ocurrences of e..

[hackerrank] Prepare > SQL > Advanced Select > type of triangle [문제] Write a query identifying the type of each record in the TRIANGLES table using its three side lengths. Output one of the following statements for each record in the table: Equilateral: It's a triangle with sides of equal length. Isosceles: It's a triangle with sides of equal length. Scalene: It's a triangle with sides of differ..

[hackerrank] Prepare > SQL > Advanced Select > Binary Tree Nodes [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 Binary Tree ordered by the value of the node. Output one of the following for each node: Root: If node is root node. Leaf: If node is leaf node. In..

[hackerrank] Prepare > SQL > Basic Select > Employee Salaries [문제] Write a query that prints a list of employee names (i.e.: the name attribute) for employees in Employee having a salary greater than per month who have been employees for less than months. Sort your result by ascending employee_id. Input Format The Employee table containing employee data for a company is described as follows: whe..

[hackerrank] Prepare > SQL > Basic Select > Higher Than 75 Marks [문제] Query the Name of any student in STUDENTS who scored higher than Marks. Order your output by the last three characters of each name. If two or more students both have names ending in the same last three characters (i.e.: Bobby, Robby, etc.), secondary sort them by ascending ID. Input Format The STUDENTS table is described as f..

[hackerrank] Prepare > SQL > Basic Select > Weather Observation Station 12 [문제] Query the list of CITY names from STATION that do not start with vowels and do not end with vowels. Your result cannot contain duplicates. Input Format The STATION table is described as follows: where LAT_N is the northern latitude and LONG_W is the western longitude. [MYSQL] [ORCALE] select distinct(city) from stati..