mysql - 如何修改查询以排除两个特定列？

Question

因此，我的 select 语句中有两个 View 显示此信息:

--------------------------------------------------------------
| branchID | branchName | staffNo | Full Name | salary | ... |
--------------------------------------------------------------
| ....                                                       |
--------------------------------------------------------------

这是我的查询:

SELECT *
FROM EmployeesAndSalaryByBranch E, CustomersByBranch C
WHERE E.branchID <> 'Headquarters';

现在，我不想从查询结果中删除 branchId 和 branchName 列。一种方法是创建一个临时表并删除列，但这效率很低。

谢谢!

Answer 1

只需从 select 语句中排除列即可:

此连接名字和姓氏之间没有空格:

SELECT staffNo, CONCAT(firstName, lastName) AS [Full Name], salary
FROM EmployeesAndSalaryByBranch E, CustomersByBranch C
WHERE E.branchID <> 'Headquarters';

这包括名字和姓氏之间的空格:

SELECT staffNo, CONCAT(firstName, ' ', lastName) AS [Full Name], salary
FROM EmployeesAndSalaryByBranch E, CustomersByBranch C
WHERE E.branchID <> 'Headquarters';