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MySQL高级——查询优化1（小表驱动大表）

小志的博客发布时间：2021-03-15 22:39:28 ，浏览量：4

- 一、类似于java中的嵌套查询
- 二、Mysql优化原则
- 三、Mysql优化案例一
- 四、Mysql优化案例二
- 五、exists语法的理解
- 六、总结

一、类似于java中的嵌套查询

1、java嵌套查询案例一


for(int i=0;i


    
        
            
                
                
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	请求信息 : 2025-08-08 22:51:44 HTTP/2.0 GET : /home/article/detail/id/214643.html
运行时间 : 1.8097s ( Load:0.0356s Init:1.6470s Exec:0.0761s Template:0.0510s )
吞吐率 : 0.55req/s
内存开销 : 1,923.85 kb
查询信息 : 18 queries 0 writes 
文件加载 : 36
缓存信息 : 5 gets 0 writes 
配置加载 : 132
会话信息 : SESSION_ID=uj3d0v5djj79os10budrpgh4us
    
    
        
    
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	[2] session_save_path(): open_basedir restriction in effect. File(/var/lib/php/session) is not within the allowed path(s): (/www/wwwroot/www.chaojiit.com/:/tmp/) /www/wwwroot/www.chaojiit.com/ThinkPHP/Common/functions.php 第 1239 行.
[8192] Array and string offset access syntax with curly braces is deprecated /www/wwwroot/www.chaojiit.com/ThinkPHP/Library/Think/Cache/Driver/File.class.php 第 59 行.
[8] Undefined variable: user /www/wwwroot/www.chaojiit.com/Application/Runtime/Cache/Home/3c8a1a47a3534a7b1252c226abfc3928.php 第 37 行.
[8] Undefined variable: user /www/wwwroot/www.chaojiit.com/Application/Runtime/Cache/Home/3c8a1a47a3534a7b1252c226abfc3928.php 第 98 行.
[8] Trying to access array offset on value of type null /www/wwwroot/www.chaojiit.com/Application/Runtime/Cache/Home/3c8a1a47a3534a7b1252c226abfc3928.php 第 98 行.
[8] Undefined variable: user /www/wwwroot/www.chaojiit.com/Application/Runtime/Cache/Home/3c8a1a47a3534a7b1252c226abfc3928.php 第 99 行.
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1.8097s