犯奈正奈矛奈旦午奶件犯永弁旦

Nov 25, 20190 likes7,176 views

This document discusses various programming languages and databases that can be learned on Progate including HTML/CSS, JavaScript, React, Ruby, Python, and Go. It also discusses SQL and database concepts like the query parser, optimizer, executor, and how SELECT queries from the users table return specific rows that match the query criteria. Examples of indexes and performance improvements with indexes are provided as well as examples of joining data from multiple tables in a database.

? HTML/CSS
? Javascript
? React
? etc ...
? Ruby
? Python
? Go
? Ruby on Rails
? etc ...
? SQL

Parser
Optimizer
(Planner)
Executor
?
SELECT * FROM users;

#1
id name
1 nakamura
2 kato
3 takahashi
4 sato
5 akiyama
6 yamamoto
users
SELECT *?
FROM users?
WHERE name = §akiyama§;
name akiyama

#1
?
?
?
?
??
?
?
InnoDB ?
https://dev.mysql.com/doc/refman/5.6/ja/innodb-buffer-pool.html

id score
1 25
2 182
3 40
4 433
5 95
6 126
scores
96
~95 96~
26, 41 127, 183
score
1 3 5 6 2 4
?
?
?
( )

#2
id score
1 25
2 182
3 40
4 433
5 95
6 126
scores
SELECT count(1)?
FROM scores?
WHERE score >= 100;
socre 100
96
~95 96~
26, 41 127, 183
score
1 3 5 6 2 4

? ?
blood_type
AB, B, O
... ... ... ...
＃ null＃
deleted_at
2019,null
...

#3
SELECT *?
FROM users?
WHERE blood_type = §A§?
AND age >=27 AND age < 80;
A 27 ?
80
id age blood_type
1 26 A
2 49 AB
3 16 O
4 5 A
5 37 A
6 81 A
users
27
6, 17 38,80
age
4 3 1 5 2 6
blood_type
1 4 6 2 3
AB,O
5

#3
? blood_type ?
? age ?
? / ?
? blood_type age

#3
? blood_type ?
? age ?
? / ?
? blood_type age
4 ?

#3
? blood_type ?
? age ?
? / ?
? blood_type age
4 ?
2 ?

#3
? blood_type ?
? age ?
? / ?
? blood_type age
?
4 ?
2 ?
??? MySQL ?
PostgreSQL BitmapAnd

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犯奈正奈矛奈旦午奶件犯永弁旦

1. Progate

2. ? HTML/CSS ? Javascript ? React ? etc ... ? Ruby ? Python ? Go ? Ruby on Rails ? etc ... ? SQL

3. Parser Optimizer (Planner) Executor ? SELECT * FROM users;

4. ?

5. #1 id name 1 nakamura 2 kato 3 takahashi 4 sato 5 akiyama 6 yamamoto users SELECT *? FROM users? WHERE name = §akiyama§; name akiyama

6. #1 ? ? ? ?

7. #1 ? ? ? ? ??

8. #1 ? ? ? ? ?? ?

9. #1 ? ? ? ? ?? ? ? InnoDB ? https://dev.mysql.com/doc/refman/5.6/ja/innodb-buffer-pool.html

11. id score 1 25 2 182 3 40 4 433 5 95 6 126 scores 96 ~95 96~ 26, 41 127, 183 score 1 3 5 6 2 4 ? ? ? ( )

12. ( : AppStore ) ~~ ~ ~ ＃ 1 ~ ＃＃＃＃

13. #2 id score 1 25 2 182 3 40 4 433 5 95 6 126 scores SELECT count(1)? FROM scores? WHERE score >= 100; socre 100 96 ~95 96~ 26, 41 127, 183 score 1 3 5 6 2 4

14. #2 ? ? ? /

15. #2 ? ? ? / ?

16. #2 ? ? ? / ? ?

17. ? ? blood_type AB, B, O ... ... ... ... ＃ null＃ deleted_at 2019,null ...

18. #3 SELECT *? FROM users? WHERE blood_type = §A§? AND age >=27 AND age < 80; A 27 ? 80 id age blood_type 1 26 A 2 49 AB 3 16 O 4 5 A 5 37 A 6 81 A users 27 6, 17 38,80 age 4 3 1 5 2 6 blood_type 1 4 6 2 3 AB,O 5

19. #3 ? blood_type ? ? age ? ? / ? ? blood_type age

20. #3 ? blood_type ? ? age ? ? / ? ? blood_type age 4 ?

21. #3 ? blood_type ? ? age ? ? / ? ? blood_type age 4 ? 2 ?

22. #3 ? blood_type ? ? age ? ? / ? ? blood_type age ? 4 ? 2 ?

23. #3 ? blood_type ? ? age ? ? / ? ? blood_type age ? 4 ? 2 ? ??? MySQL ? PostgreSQL BitmapAnd

24. ? Optimizer ? ? ?

端端舝

犯奈正奈矛奈旦午奶件犯永弁旦

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