Examine which part of the query will be executed first for the query given below.Select Employee_id,Employee_Name from Employeewhere Department_Name in(Select Department_Name from Employee where Department_name in (‘Sales’,'Marketing’));
Question
Examine which part of the query will be executed first for the query given below.Select Employee_id,Employee_Name from Employeewhere Department_Name in(Select Department_Name from Employee where Department_name in (‘Sales’,'Marketing’));
Solution
The first part of the query to be executed is the innermost subquery. In this case, it is:
Select Department_Name from Employee where Department_name in (‘Sales’,'Marketing’)
This subquery is selecting the department names from the Employee table where the department name is either 'Sales' or 'Marketing'. The result of this subquery will be a list of department names.
The next part of the query to be executed is the outer query:
Select Employee_id,Employee_Name from Employee where Department_Name in
This part of the query is selecting the employee id and employee name from the Employee table where the department name is in the list of department names returned by the subquery.
So, the execution order is from inside to outside. First, the subquery is executed, and then the outer query is executed using the results of the subquery.
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