请求 JPQL JEE

Question

Please i need to select list of employees except the employees who have the role admin. However I got a syntax issue. this is the code: SELECT e FROM Employee e EXCEPT SELECT e FROM Employee e WHERE e.role = 'admin';

Answer 1

The best way to select all records from a table except those which satisfy a condition is using a WHERE clause with a negative comparison (any of != , <> or NOT ).

You may find more information about SQL's WHERE clauses there: https://www.w3schools.com/sql/sql_where.asp

In your specific case, something like this should do the trick:

SELECT *
FROM Employee
WHERE role != 'admin';

Answer 2

You don't appear to be selecting any fields.

Here's an example of using except

SELECT id, name, category, price FROM Books1
Except
SELECT id, name, category, price FROM Books1 WHERE price > 5000