데이터 공부를 기록하는 공간

https://www.hackerrank.com/domains/sql?filters%5Bskills%5D%5B%5D=SQL%20%28Advanced%29 Solve SQL Code Challenges A special-purpose language designed for managing data held in a relational database. www.hackerrank.com ☆ Draw The Triangle 1 SET @num = 21; SELECT REPEAT("* ", @num:=@num-1) /* for without table */ FROM INFORMATION_SCHEMA.TABLES WHERE @num > 0 Draw The Triangle 2 SET @num = 0; SELECT ..