Question

ERROR:  column "countis" does not exist

和

ERROR:  column "percentage" does not exist

发生错误

我正在犯什么错误，大概不是一个错误那么复杂。

    select avclassfamily as avclass
        , count(*) as countis,
        sum(case when avclassfamily = avclassfamily and lolbin=True then 1 else 0 end) as lolbinnumber
        , 
        case sum(case when avclassfamily = avclassfamily and lolbin=True then 1 else 0 end) when 0 then NULL else (sum(case when avclassfamily = avclassfamily and lolbin=True then 1 else 0 end) * 100 / count(*) ) end as percentage

    from malwarehashesandstrings where behaviouralbinary=True and countis >= 10 and percentage < 10
    group by avclassfamily 
    order by percentage desc NULLS LAST;

表的数据库架构为：

    CREATE TABLE malwarehashesandstrings (
    malware_id bigserial primary key,
    malwarehashmd5 varchar(1000) default NULL,
    malwarehashsha1 varchar(1000) default NULL,
    malwarehashsha256 varchar(1000) default NULL,
    virustotalstring text NOT NULL
    );





    ALTER TABLE malwarehashesandstrings ADD COLUMN v3api boolean default false;
    ALTER TABLE malwarehashesandstrings ADD COLUMN numpositives SMALLINT default NULL;
    ALTER TABLE malwarehashesandstrings ADD COLUMN avclassfamily varchar(1000) default NULL;


    ALTER TABLE malwarehashesandstrings ADD COLUMN lolbins boolean default false;
    ALTER TABLE malwarehashesandstrings ADD COLUMN lolbintype varchar(1000) default NULL;
    ALTER TABLE malwarehashesandstrings ADD COLUMN origindataset varchar(1000) default NULL;

希望这有助于诊断

Answer 1

该问题在以下博客文章中得到了说明：

https://www.postgresql.org/message-id/18195.1038530280@sss.pgh.pa.us

实际使用的查询如下所示，这是因为查询的where部分是在select之前进行处理的。

Postgres选择语句，列不存在

1 个答案: