Why this request does not give an error?
The query below is from the HR schema that is included in the database.If we separate the subquery gives us an error, but if we execute all of the query, execute it, and sends us a result (fake, of course).
SELECT last_name, department_id, job_id
Employees
WHERE department_id = (SELECT department_id
Sites
WHERE location_id = 1700);
Hello
Welcome to the forum!
user7363993 wrote:
The query below is from the HR schema that is included in the database.
If we separate the subquery gives us an error, but if we execute all of the query, execute it, and sends us a result (fake, of course).
In fact, the results are correct. Not what you were expecting, maybe, but they're right.
If the request is reasonable or not is a separate issue.
SELECT last_name, department_id, job_id
Employees
WHERE department_id = (SELECT department_id
Sites
WHERE location_id = 1700);
If you simply run the subquery, you get an error because there is no column called department_id in any table that is in the scope. (Places would be the only scope table; in fact, the places would be the only table, period).
What you posted is a correlated subquery . In a correlated subquery, you can reference columns of the query of the mother. Employees and locations of the tables are in scope in the subquery.
It might be easier to understand if you wrote the query like this:
SELECT last_name
, department_id
, job_id
FROM employees e
WHERE department_id = (
SELECT e.department_id
FROM locations l
WHERE l.location_id = 1700
)
;
It is 100% equivalent to the query you posted. I wasn't to give alias names to all tables and qualify the column names with those aliases in the subquery. Since there is no ambiguity (i.e. department_id exists only in the employees table and location_id exists only in the table of communities) the compiler doesn't care if you qualify the columns with the table alias or not.
(Even if the same column exist in both tables, you would get an error. Locations being the only table in the FROM clause in the subquery, the compiler assumes that all of the columns named ambiguously came from this table.)
Tags: Database
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