ORA-00920：无效的关系运算符3

Question

create or replace view test as
select b.npm1,b.nama,b.IPS,a.ket as ket1,b.IPK,a.ket as ket2
from KHS b left join keterangan a on a.nilai = IPS and
left join keterangan a on a.nilai = IPK

请帮帮我，我的代码出错了什么!!

Answer 1

首先，你有一个流浪的＆＃39;和＆＃39;在你的两个连接之间（可能是错误的来源）。其次，即使您想要两次加入同一个表，也需要对表进行不同的别名。生成的代码应如下所示：

CREATE OR REPLACE view test AS
SELECT 
    b.npm1,
    b.nama,
    b.IPS,
    a1.ket AS ket1,
    b.IPK,
    a2.ket AS ket2
FROM KHS b 
    LEFT JOIN keterangan a1 
        ON a1.nilai = b.IPS 
    LEFT JOIN keterangan a2
        ON a2.nilai = b.IPK