我打算编写以下查询：

INSERT INTO summary (user_id, total_points, count_operations)
SELECT 
   15 AS user_id,
   (SELECT SUM(points) FROM operations WHERE user_id = 15) AS total_points,
   (SELECT COUNT(*) FROM operations WHERE user_id = 15) AS count_operations
ON DUPLICATE KEY UPDATE
total_points = VALUES(total_points), 
count_operations = VALUES(count_operations);

整个陈述是原子的吗？即MySQL（带有MyISAM引擎）内部锁定operations表吗？

MySQL是否有可能顺序执行两个子查询，这在某些情况下（如果在该时间范围内添加了新操作）会导致total_points和count_operations不一致？