如何从SQL中的两个不同表中获取相同列名的值

Question

How to get values for same column name from two different tables in SQL?

column name is emp_id loacated in these two tables: company,employee .

Answer 1

If you want data in seperate columns from two tables then try :

SELECT c.emp_id, emp.emp_id 
FROM company c
INNER JOIN employee emp on c.company_id = emp.company_id 

If you want to merge both columns data then use this :

SELECT emp_id FROM company
UNION
SELECT emp_id FROM employee

Answer 2

Just put the name of the table before the name of the colomn with a "." between, like:

SELECT company.emp_id, employe.emp_id

Answer 3

使用它来获得结果：

company.emp_id, employee.emp_id

Answer 4

You can do what you are asking, something like the example below, but if you provide a sample query, it would help...

select emp.emp_id,company.emp_id
from company
join employee emp on emp.company_id=company_company_id