■ 출처- 코딩테스트 : SQLite / 연습문제 / 난이도1https://solvesql.com/problems/?page=1 https://solvesql.com/problems/?page=1 solvesql.com ■ 연습문제1. 모든 데이터 조회하기SELECT *FROM points 2. 일부 데이터 조회하기SELECT *FROM points WHERE quartet = 'I' 3. 데이터 정렬하기SELECT *FROM pointsWHERE quartet = 'I'ORDER BY y asc 4. 데이터 그룹으로 묶기SELECT quartet, ROUND(AVG(x), 2) as x_mean, ROUND(variance(x), 2) as x_var , ROUND(AVG(y), ..