7. Display the employee's name, salary and commission multiplied by 2. If an employee doesn't earn the commission, then display as 'no commission'. Name the columns appropriately

Question

1.00/5 (1 vote)

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SQL-Server-2014

Msg 512, Level 16, State 1, Line 1
Subquery returned more than 1 value. This is not permitted when the subquery follows =, !=, <, <= , >, >= or when the subquery is used as an expression.

What I have tried:

select
first_name,salary,
case when (commission*2)>0 then (select (commission*2) from employees)
else 'nocommission'
end
from employees

Posted 17-Dec-17 17:14pm

Member 13581623

Updated 17-Dec-17 17:53pm

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Bryian Tan · Answer 1 · 2017-12-17T17:41:00

Which employee the query trying to select? (select (commission*2) from employees) --> this can be 1, 10, 100, 1000 records. Try something like below.

SQL

select
e1.first_name,e1.salary,
case 
	when (e1.commission*2)>0 then (select TOP 1 (e2.commission*2) from employees e2 WHERE e1.EmployeeId = e2.EmployeeId)
	else 'nocommission'
end
from employees e1

Dave Kreskowiak · Answer 2 · 2017-12-17T17:53:00

Your subquery is returning the commission * 2 for every record in the employee table. It should only return a single record, not all of them. You don't appear to have a primary key stated anywhere, so you really can't use a subquery.

But, why are you even doing a subquery? Your case statement doesn't really make any sense. If commission * 2 is greater than 0 go do a select? Why? Your entire query should only be this:

SELECT first_name, salary, commission * 2 AS commission FROM employees

Of course, that means every commission of zero would return a 0, not "nocommission". A column should ever only return a single data type, not a numeric value for one record and a char value for another.

Of course, you could.

SELECT first_name, salary,
CASE
    WHEN commission > 0 THEN commission * 2
    ELSE 'No Commission'
END
FROM employees

7. Display the employee's name, salary and commission multiplied by 2. If an employee doesn't earn the commission, then display as 'no commission'. Name the columns appropriately

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