10min LT slide for Web Engineer Study #07 https://web-engineer-meetup.connpass.com/event/85964/

5. •
•
•
•

6. https://use-the-index-luke.com/ja/sql/
table-of-contents
https://b.l0g.jp/uncategorized/sql-performance-explained-ja/

9. https://thinkit.co.jp/article/9658

12. ↓
#WEB 07

16. N
1

17. 1 2

19. https://use-the-index-luke.com/ja/sql/anatomy/the-leaf-nodes

20. https://use-the-index-luke.com/ja/sql/anatomy/the-tree

21. https://speakerdeck.com/soudai/mysql-and-postgresql

22. ID ID
101 15
106 25
111 10
103 7
103 30
105 25
106 25
ID ID 103 7
103 20
103 30
104 21
104 20
105 25
ID ID

23. 25 105
25 106
25 111
15 151
20 103
20 10415 140
20 104
25 111
25 134
ID ID
ID IDID ID
15 135
25 134
30 120