• 51

## Learning Opportunities

This puzzle can be solved using the following concepts. Practice using these concepts and improve your skills.

## Goal

Puzzle is meant to be a quick intro to SQL. Nothing too wild.

Your inputs are a basic SQL table and a SELECT query command for each test case. Your program needs to parse these and output the correct query results.

For simplicity there are no commands to manipulate tables and only one table to select from. Nothing more advanced than basic SELECT.

Basic structure of query is as follows:
SELECT column_name1, column_name2 FROM table_name1

SELECT tells you which columns to keep from the input table for your output table. FROM specifies the name of the table. For this puzzle it won't matter, therefore simply keeping the relevant columns is enough for this query.

SELECT * will select all columns.

SELECT column_name1, column_name2 FROM table_name1 WHERE column_name1 =
ColumnValue
ORDER BY column_name2 DESC

WHERE tells you what conditions must be met to display a row. Multiple conditions can be concatenated with AND, OR. Since this is an easy puzzle the only condition you need to check for is if the values are equal.

ORDER BY value DESC is the criteria for sorting the table rows. The sorting can be either ascending ASC or descending DESC

NOTE: sort numerical columns by their numerical value and not by their string value.

https://www.w3schools.com/sql/default.asp

Image source: https://unsplash.com/photos/PkbZahEG2Ng
Input
Line 1: A string containing the query you need to parse.
Line 2: An integer n for the number of table rows (or entries).
Line 3: A string representing a table header, containing the title of each table column, separated by space.
Following n Lines: A string representing the values for each column, separated by space.
Output
Line 1: A string representing the header of the table, containing the selected column titles separated by space.
Following Lines: A string representing the values for each selected column, separated by space.
Constraints
2 ≤ Columns ≤ 10
2 ≤ N ≤ 30
Example
Input
SELECT * FROM cats
3
Name Breed
McFur Peterbald
Squeeky Bambino
Greta Laperm
Output
Name Breed
McFur Peterbald
Squeeky Bambino
Greta Laperm

A higher resolution is required to access the IDE

Join the CodinGame community on Discord to chat about puzzle contributions, challenges, streams, blog articles - all that good stuff!
Online Participants