Why Would Unknown Column Be Referenced in SQL Query - sql

Question

I am in the process of updating some SQL queries to run against MariaDB instead of via SQL Anywhere. One query I'm running is erroring with this:
Error Code: 1054. Unknown column 'choice' in 'field list'
That is for this query:
SELECT
(select firstname||' '||lastname||' ('||service||')' from staff_members where id_number = customer_assignment_reviews.staff_member_id) as Rep,
(select customer_firstname||' '|| customer_lastname from customers where id_number = customer_assignment_reviews.cs_id) as Cus,
last_modified as "Response Date",replace(review_reason,'’','') as "Reason",
(Select choice = CASE
when accepted = 0 then 'No'
when accepted = 1 then 'Yes'
end) as "Accepted?"
FROM customer_assignment_reviews
where staff_member_id in (Select id_number from kar.staff_members where division_id = 6)
and "Response Date" between today() - 7 and today() /* Date Range */
and "Accepted?" = 'No'
Order by 3 desc
Is this error message as straightforward as it sounds? It's simply saying the column "choice" doesn't exist on the target table?
I'm just trying to reason through why this code (which I inherited) would be referencing a column that does not exist. Could something be expected here at runtime?

Answer 1

You don't need to use subquery in SELECT list
SELECT
-- ...
(Select choice = CASE
when accepted = 0 then 'No'
when accepted = 1 then 'Yes'
end) as "Accepted?"
=>
SELECT
CASE
when accepted = 0 then 'No'
when accepted = 1 then 'Yes'
end as "Accepted?"
Additionaly syntax SELECT alias = expression is only T-SQL specific:
SELECT alias = 1
<=>
SELECT 1 AS alias

Answer 2

What is this supposed to mean?
(Select choice = CASE
when accepted = 0 then 'No'
when accepted = 1 then 'Yes'
end) as "Accepted?"
Very importantly, a select is not needed here. You might mean:
(case when accepted = 0 then 'No'
when accepted = 1 then 'Yes'
end) as is_accepted -- prefer to not have to need escape characters
If accepted only takes those two values, you can simplify this to:
elt(accepted + 1, 'No', 'Yes') as is_accepted