Question

Describe the output of the following SQL query:

select custId, name
from customer
where region = "New York"
UNION 
select cust.custId, cust.name
from customer cust
where cust.custId IN (select cust_order.custId
from customer_order cust_order, company_employee comp_emp
where cust_order.salesEmpId = comp_emp.empId
AND comp_emp.name = 'DANIEL');

My question is: at the line which contains from customer cust is ‘cust’ referring to a column in the customer table?

This is a homework question I have identified the components leading up to this line
and I think that cust is a column in the customer table…
I am not asking for an overall solution just a bit of encouragement if I am on the right track…

Answer 1

You should have a look at Sql Server TABLE ALIASING

Have a closer look at SELECT Clause (Transact-SQL) and search for alias