Question

Let’s say I have the following SQL query:

SELECT *
FROM employee 
INNER JOIN department ON employee.EmpID = department.EmpID

I wanted to ask, why I am getting two EmpID columns, and how can I get only one of those, preferably the first.

I’m using SQL server

Answer 1

SELECT employee.EmpID, employee.name, ...
FROM employee 
INNER JOIN department ON employee.EmpID=department.EmpID

Be precise and specify which columns you need instead of using the astrisk to select all columns.