Question

当我尝试运行例程时，我收到以下错误：

错误代码：1166。错误的列名称＆＃39;学校。学校姓名`=案例当学校.Web学校名称`为null然后学校。学校名字` ELS＆＃39;

我仔细检查了列名，实际上有一个School.School Name。没有前导或尾随空格。这是错误所指的例程的开始：

CREATE temporary TABLE tt_Step1
SELECT DISTINCT State.Code, State.Name, 
School.`School Name` = case 
    when School.`Web School Name` is null then School.`School Name`
    else School.`Web School Name`
    end,
School.`School ID` 
-- Into tt_Step1
FROM State LEFT JOIN School ON State.Code = School.State 
Where (School.`School ID` <> ...

我最近将此代码从MSSQL转换为MySQL，因此我可能会遗漏一些但我找不到任何错误。原始的MSSQL查询在SQL Server Management Studio中运行良好，但在MySQL中转换后的版本却没有。

Answer 1

试一试：

CREATE temporary TABLE tt_Step1
SELECT DISTINCT State.Code, State.Name, 
coalesce(School.`Web School Name`, School.`School Name`),
School.`School ID` 
-- Into tt_Step1
FROM State LEFT JOIN School ON State.Code = School.State 
Where (School.`School ID` <> ...

Answer 2

你有几个问题。

您不能使用多部分名称（例如School.School Name。
MySql中的别名由blah as ColumnName完成，而不是ColumnName = blah。

Answer 3

In my case, it was caused by an unseen extra space after the column name. I wrote promotion-ids instead of promotion-id.

Answer 4

我有类似的问题。通过在case语句中添加列名来解决我的问题。

示例：

Case

  when val <.5 then "low"

  when val >1 then "high"

end as valTest

如果没有as valTest，我会收到1166错误。

MySQL错误代码1166.列名不正确

4 个答案: