小编Wil*_*eri的帖子

我的查询有问题，怎么了？

SELECT 
    CASE 
        WHEN cp_pessoa.score < 100 THEN 1 
        WHEN cp_pessoa.score < 300 THEN 2 
        WHEN cp_pessoa.score >= 300 THEN 3 
    END as id_ranking
FROM cp_pessoa 
    WHERE id_ranking IN (1,2);

我收到此错误：＃1054-“ where子句”中的未知列“ id_ranking”

谢谢！