SELECT
'Low Salary' AS Category,
SUM(income < 20000) AS accounts_count
FROM Accounts
UNION ALL
SELECT
'Average Salary' Category,
SUM(income >= 20000 AND income <= 50000) AS accounts_count
FROM Accounts
UNION ALL
SELECT
'High Salary' category,
SUM(income > 50000) AS accounts_count
FROM Accounts;