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목록Developer_JoyKim (28)
CodingSpace
What: 기본키 (Primary Key) 기본키 변경하기 (제거) ALTER TABLE (테이블명) DROP PRIMARY KEY; ex) ALTER TABLE people DROP PRIMARY KEY; 기본키 변경하기 (추가) ALTER TABLE (테이블명) ADD PRIMARY KEY (컬럼명); ex) ALTER TABLE people ADD PRIMARY KEY (last_name); 다중 기본키 추가 ALTER TABLE (테이블명) ADD PRIMARY KEY (컬럼명1, 컬럼명2); ex) ALTER TABLE people ADD PRIMARY KEY (first_name, last_name); 고유키 (Unique Key) 외래키 (Foreign Key) 외래키 추가 ALTER TAB..
What: NFT를 민팅하게되면 NFT의 metadata를 불러올 수 있는 주소를 입력하게 된다. 이 주소가 바로 tokenURI 대다수의 경우 metadata를 Pinata를 이용해 ipfs에 저장하고, tokenURI의 형태는 ipfs://{CID}가 됨 하지만 NFT의 metadata가 변할 수 있는 서비스(ex. M2E)가 생겨남에 따라 tokenURI에 API 서버의 주소를 입력하는 사례가 생겨남 여기서 주의해야할 점은 API 서버의 주소를 tokenURI를 사용한다면, 꼭 http or https를 입력해줘야함! 올바른 tokenURI 입력값: https://all-con.kr 잘못된 tokenURI 입력값: api.all-con.kr 만약 http or https를 제외한 도메인 주소를 입력..
Problem. Warmup - Compare the Triplets Link. https://www.hackerrank.com/challenges/compare-the-triplets/problem?isFullScreen=true Compare the Triplets | HackerRank Compare the elements in two triplets. www.hackerrank.com Description. Alice and Bob each created one problem for HackerRank. A reviewer rates the two challenges, awarding points on a scale from 1 to 100 for three categories: problem c..
Problem. Warmup - Staircase Link. https://www.hackerrank.com/challenges/staircase/problem?isFullScreen=true Staircase | HackerRank Print a right-aligned staircase with n steps. www.hackerrank.com Description. Key Point. My Answer. 'use strict'; process.stdin.resume(); process.stdin.setEncoding('utf-8'); let inputString = ''; let currentLine = 0; process.stdin.on('data', function(inputStdin) { in..
Problem. Implementation - Repeated String Link. https://www.hackerrank.com/challenges/repeated-string/problem?isFullScreen=true Repeated String | HackerRank Find and print the number of letter a's in the first n letters of an infinitely large periodic string. www.hackerrank.com Description. There is a string, s, of lowercase English letters that is repeated infinitely many times. Given an intege..
Problem. Implementation - Cats and a Mouse Link. https://www.hackerrank.com/challenges/cats-and-a-mouse/problem?isFullScreen=true Cats and a Mouse | HackerRank Which cat will catch the mouse first? www.hackerrank.com Description. Two cats and a mouse are at various positions on a line. You will be given their starting positions. Your task is to determine which cat will reach the mouse first, ass..
Problem. Implementation - Number Line Jumps Link. https://www.hackerrank.com/challenges/kangaroo/problem?isFullScreen=true Number Line Jumps | HackerRank Can two kangaroo meet after making the same number of jumps? www.hackerrank.com Description. You are choreographing a circus show with various animals. For one act, you are given two kangaroos on a number line ready to jump in the positive dire..
Problem. Warmup - Grading Students Link. https://www.hackerrank.com/challenges/grading/problem?isFullScreen=true Grading Students | HackerRank Round student grades according to Sam's rules. www.hackerrank.com Description. HackerLand University has the following grading policy: Every student receives a grade in the inclusive range from 0 to 100. Any grade less than 40 is a failing grade. Sam is a..