sql - 使用 Select 连接两个表，只显示几列并且还有一个 between 条件

Question

我用谷歌搜索并搜索了这个地方，但找不到我能找到的答案，因为其他人的不同。

USE TestDatabase
Select Firstname,Lastname,Salary From Employee as E 
Join JobTitle as J
on E.JobTitleID = J.JobTitleID

WHERE Salary 
BETWEEN $25000.00 AND $50000.00

这可行，但我试图显示 JobTitle Table 中的两列，我不知道要搜索什么词或谷歌，也找不到简单的答案。任何人都可以帮助一些人，但我很困惑。我在学校使用服务器 2008 t-sql

Answer 1

您可以使用表格的别名JobTitle来J选择您想要选择的任何额外列

Select Firstname, Lastname, Salary, 
   j.Field1, j.Field2 ... -- and other fields you want to select here
From Employee as E 
Join JobTitle as J
on E.JobTitleID = J.JobTitleID

WHERE Salary 
BETWEEN $25000.00 AND $50000.00

Answer 2

使用别名将谁是您正在使用的表设置到该字段。

Select
    E.Firstname,E.Lastname,E.Salary,
    j.JobTitle, j.Otherfieldyouwanttoselect
From Employee as E Join JobTitle as J on E.JobTitleID = J.JobTitleID
WHERE
    Salary BETWEEN $25000.00 AND $50000.00

Answer 3

你的意思是这样吗？

USE TestDatabase
Select Firstname,Lastname,Salary,J.YourcolumnfromJobTitle  From Employee as E 
Join JobTitle as J
on E.JobTitleID = J.JobTitleID

WHERE Salary 
BETWEEN $25000.00 AND $50000.00

Answer 4

Select E.Firstname, E.Lastname, E.Salary, J.Column1, J.Column2
    From Employee as E 
        Join JobTitle as J
            on E.JobTitleID = J.JobTitleID
    WHERE E.Salary BETWEEN $25000.00 AND $50000.00

Answer 5

您应该为这两个表使用别名，如下所示：

USE TestDatabase
Select E.Firstname,E.Lastname,E.Salary,J.Column1,j.Column2 From Employee as E 
Join JobTitle as J
on E.JobTitleID = J.JobTitleID

WHERE E.Salary 
BETWEEN $25000.00 AND $50000.00