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Charges using CROSS JOIN
SELECT *, ROUND(amount / total * 100) AS percent
FROM charges
CROSS JOIN (SELECT SUM(amount) AS total FROM charges) t;
+----+--------+-------+---------+
| id | amount | total | percent |
+----+--------+-------+---------+
| 1 | 18.00 | 60.00 | 30 |
| 2 | 15.00 | 60.00 | 25 |
| 3 | 27.00 | 60.00 | 45 |
+----+--------+-------+---------+
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