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中国农业大学
23 小时
Adventurous woman creates career behind camera
Born in 1987 in Sanming, Fujian province, Qiubi said that she got her first Canon compact camera, a gift from her father when ...
51CTO
1 天
十个导致性能问题的常见SQL错误
这会增加获取数据的时间,尤其是在表中有很多列的情况下。 示例: SELECT * FROM Employees WHERE Salary > 50000; 这个查询获取了所有列(EmployeeID、Name、Department等),但也许你只需要Name和Salary列。 解决方案:只获取必要的列。 错误:使用低效的连接可能会降低性能 ...
51CTO
12 天
MySQL超全优化清单执行指南
例子:避免使用子查询,改用 JOIN。 SELECT u.name, o.amount FROM users u JOIN orders o ON u.id = o.user_id; 使用UNION代替OR、优化ORDER BY和GROUP BY 确保 ORDER BY 和 GROUP BY 的列上有索引。 例子:在排序和分组列上添加索引。 CREATE INDEX idx_order_date ...
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