UNION operator does not return any results in SQLite - sqlite

Question

I am working in SQLite and trying to make a query to return a table containing top five jobs in each of four regions (coastal, alpine, regional and metro) based on their respective incomes.
Each SELECT statement for a specific region returns correct result however, appending these separate results in one table using UNION does not return any table where UNION is underlined in red:
--
select job,
-- income as "Top_incomes",
1 as "income",
region.name
from customers
JOIN customer_region on customers.id = customer_region.customer_id
JOIN region on region.id = customer_region.region_id
where region.name = "regional"
ORDER by income DESC limit 5;
UNION
select job,
-- income as "Top_incomes",
2 as "income",
region.name
from customers
JOIN customer_region on customers.id = customer_region.customer_id
JOIN region on region.id = customer_region.region_id
where region.name = "coastal"
ORDER by income DESC limit 5
Although the number of columns per each statement is 3 and they all have the same column names for each statement, I am not sure why UNION does not return any result as a single table. Is there any wrong query syntax here? Thanks
--
select job,
-- income as "Top_incomes",
1 as "income",
region.name
from customers
JOIN customer_region on customers.id = customer_region.customer_id
JOIN region on region.id = customer_region.region_id
where region.name = "regional"
ORDER by income DESC limit 5;
UNION
select job,
-- income as "Top_incomes",
2 as "income",
region.name
from customers
JOIN customer_region on customers.id = customer_region.customer_id
JOIN region on region.id = customer_region.region_id
where region.name = "coastal"
ORDER by income DESC limit 5
I was expecting to get a single table containing results from each SELECT statement: 5 top-income jobs from the 'regional' region followed by the 5 top-income jobs from the 'coastal' region. I did not get any results back.

Answer 1

In a union query, the outermost ORDER BY clause applies to the entire query, not any individual select. You may use the following syntax:
SELECT *
FROM
(
SELECT job,
income AS Top_incomes,
1 AS income,
r.name
FROM customers c
INNER JOIN customer_region rc ON c.id = cr.customer_id
INNER JOIN region r ON r.id = cr.region_id
WHERE r.name = 'regional'
ORDER BY income DESC
LIMIT 5
)
UNION
SELECT *
FROM
(
SELECT job,
income,
2,
r.name
FROM customers c
INNER JOIN customer_region cr ON c.id = cr.customer_id
INNER JOIN region r ON r.id = cr.region_id
WHERE r.name = 'coastal'
ORDER BY income DESC
LIMIT 5
);