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SQL表的集合运算-完整学习笔记

  • 2026-02-04 23:52:26
SQL表的集合运算-完整学习笔记

SQL表的集合运算-完整学习笔记

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  2. 运行时间 : 0.225343s [ 吞吐率：4.44req/s ] 内存消耗：4,311.40kb 文件加载：140
  3. 缓存信息 : 0 reads,0 writes
  4. 会话信息 : SESSION_ID=2fb7bc84485bb7f24ff1d8d7ab04b9a1
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  1. CONNECT:[ UseTime:0.001215s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001921s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000774s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000719s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001739s ]
  6. SELECT * FROM `set` [ RunTime:0.000647s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.002009s ]
  8. SELECT * FROM `article` WHERE `id` = 465727 LIMIT 1 [ RunTime:0.001136s ]
  9. UPDATE `article` SET `lasttime` = 1770246726 WHERE `id` = 465727 [ RunTime:0.031007s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.002084s ]
  11. SELECT * FROM `article` WHERE `id` < 465727 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001267s ]
  12. SELECT * FROM `article` WHERE `id` > 465727 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.009830s ]
  13. SELECT * FROM `article` WHERE `id` < 465727 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001774s ]
  14. SELECT * FROM `article` WHERE `id` < 465727 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.004803s ]
  15. SELECT * FROM `article` WHERE `id` < 465727 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001752s ]
0.229177s