MySQL Workbench - SELECT is not valid at this position with this server version when using CASE WHEN statement

Question

When implementing a basic CASE WHEN statement in MySQL Workbench, I am getting the following error "SELECT is not valid at this position for this server version. Expecting FOR, LOCK, TABLES, VALUES, WITH, '('".

Here is my SQL query:

SELECT mode_dsc, Weight, rate, min_cost, 
CASE 
    WHEN (Weight*rate) < min_cost THEN min_cost AS Cost
    WHEN (Weight*rate) > min_cost THEN (Weight*rate) AS Cost
END AS Cost
FROM OrderLineRate
WHERE mode_dsc = "AIR";

The OrderLineRate table consists of the following:

OrderID	ProductID	mode_dsc	Weight	minm_wgh_qty	max_wgh_qty	rate	min_cost
1447133055	1678648	AIR	1.463	0	99.99	$0.05	$1.50

Software: MySQL Workbench (version 8.0.22.CE) to interact with a MySQL Server(version 8.0.22)

Answer 1

as cost is only appropriate after the end of the case.

SELECT mode_dsc, Weight, rate, min_cost, 
CASE 
    WHEN (Weight*rate) < min_cost THEN min_cost 
    WHEN (Weight*rate) > min_cost THEN (Weight*rate) 
END AS Cost
FROM OrderLineRate
WHERE mode_dsc = "AIR";