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一分钟学会Python这个硬核操作

  • 2026-08-18 23:11:17
一分钟学会Python这个硬核操作

给定两个数据表：left, right，它们至少存在一个名字相同的列，名字假定为 key，如何连接这两个表？ Python提供了 merge 操作完成这个事情。left 表的 key取值为：k0, k1, k2;  right表的 key取值为：k0, k0, k11)  如果 ...

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  1. CONNECT:[ UseTime:0.001024s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001733s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.064262s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.017060s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001538s ]
  6. SELECT * FROM `set` [ RunTime:0.014881s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.002026s ]
  8. SELECT * FROM `article` WHERE `id` = 506753 LIMIT 1 [ RunTime:0.020057s ]
  9. UPDATE `article` SET `lasttime` = 1787290479 WHERE `id` = 506753 [ RunTime:0.047745s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.101477s ]
  11. SELECT * FROM `article` WHERE `id` < 506753 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.006713s ]
  12. SELECT * FROM `article` WHERE `id` > 506753 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.027366s ]
  13. SELECT * FROM `article` WHERE `id` < 506753 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.165473s ]
  14. SELECT * FROM `article` WHERE `id` < 506753 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.142620s ]
  15. SELECT * FROM `article` WHERE `id` < 506753 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.070933s ]
0.882523s