Question

我有这个代码

select people_id,first_name 
FROM people , PUBAUTHOR_PEOPLE 
WHERE people.people_id = PUBAUTHOR_PEOPLE. people_id

并且它表示模糊定义的列是否有人知道为什么以及如何解决这个问题？

Answer 1

您应该在您的库存名称之前添加表名称，如下所示

select people.people_id,people.first_name 
FROM people , PUBAUTHOR_PEOPLE 
WHERE people.people_id = PUBAUTHOR_PEOPLE. people_id

我建议你使用如下的别名来使代码更具可读性

select p.people_id,p.first_name 
FROM people p, PUBAUTHOR_PEOPLE pp
WHERE p.people_id = pp.people_id

我还建议你使用如下的连接

select p.people_id,p.first_name 
FROM people p
join PUBAUTHOR_PEOPLE pp on p.people_id = pp.people_id

现在更具可读性，不是吗？

Answer 2

它抱怨，因为两个表都有一个名为'people_id'的列，所以你必须指定从哪个表中读取它（即使它因连接条件而相同），所以类似于：

SELECT      people.people_id,
            first_name 

FROM        people, PUBAUTHOR_PEOPLE 

WHERE       people.people_id = PUBAUTHOR_PEOPLE.people_id

列模糊定义错误

2 个答案: