sql - 连接2个表时出错

Question

查询:

select i.Name,ri.Country,ri.State,ri.City 
from Information as i
join ResidenceInformation as ri
order by Name

我得到的错误是:

Error code -1, SQL state 42X01: Syntax error: Encountered "order" at line 4, column 5.
Line 1, column 1

Execution finished after 0 s, 1 error(s) occurred.

为什么我会出错？

Answer 1

该错误是因为您忘记指定JOIN条件，例如:

  SELECT i.Name, ri.Country, ri.State, ri.City 
    FROM Information as i
    JOIN ResidenceInformation as ri ON ri.column = i.column
ORDER BY Name

您需要将 column替换为正确链接表以获取所需输出的适当列的名称。

您还应该在 ORDER BY中指定表别名，以防止出现歧义的列引用错误。