[HackerRank SQL] Print Prime Numbers

문제 link
https://www.hackerrank.com/challenges/print-prime-numbers/problem

Code link
https://github.com/JamesJung01/Hackerrank_sql/blob/main/02_Medium/Print_Prime_Numbers.sql

SELECT GROUP_CONCAT(NUMB SEPARATOR '&')
FROM (
    SELECT @num:=@num+1 as NUMB FROM
    information_schema.tables t1,
    information_schema.tables t2,
    (SELECT @num:=1) tmp
) tempNum
WHERE NUMB<=1000 AND NOT EXISTS(
    SELECT * FROM (
        SELECT @nu:=@nu+1 as NUMA FROM
            information_schema.tables t1,
            information_schema.tables t2,
            (SELECT @nu:=1) tmp1
            LIMIT 1000
        ) tatata
    WHERE FLOOR(NUMB/NUMA)=(NUMB/NUMA) AND NUMA<NUMB AND NUMA>1
);