mirrors
/
rails
mirror of https://github.com/rails/rails
8
0
Fork 0
Code Issues Projects Releases Wiki Activity

Improve readability of Explain Queries table in guides [ci skip]

This commit is contained in:
John Kelly Ferguson 2014-05-24 18:16:07 -04:00
parent a9ced732ad
commit 5ec797e2ca
2 changed files with 41 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
guides/CHANGELOG.md
View File

@ -1,3 +1,8 @@
* Split up rows in the Explain Queries table of the ActiveRecord Querying section
in order to improve readability.
* John Kelly Ferguson *
* Change all non-HTTP method 'post' references to 'article'.
*John Kelly Ferguson*

52
guides/source/active_record_querying.md
View File

@ -1703,12 +1703,19 @@ may yield
```
EXPLAIN for: SELECT `users`.* FROM `users` INNER JOIN `articles` ON `articles`.`user_id` = `users`.`id` WHERE `users`.`id` = 1
+----+-------------+-------+-------+---------------+---------+---------+-------+------+-------------+
| id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra |
+----+-------------+-------+-------+---------------+---------+---------+-------+------+-------------+
| 1 | SIMPLE | users | const | PRIMARY | PRIMARY | 4 | const | 1 | |
| 1 | SIMPLE | articles | ALL | NULL | NULL | NULL | NULL | 1 | Using where |
+----+-------------+-------+-------+---------------+---------+---------+-------+------+-------------+
+----+-------------+----------+-------+---------------+
| id | select_type | table | type | possible_keys |
+----+-------------+----------+-------+---------------+
| 1 | SIMPLE | users | const | PRIMARY |
| 1 | SIMPLE | articles | ALL | NULL |
+----+-------------+----------+-------+---------------+
+---------+---------+-------+------+-------------+
| key | key_len | ref | rows | Extra |
+---------+---------+-------+------+-------------+
| PRIMARY | 4 | const | 1 | |
| NULL | NULL | NULL | 1 | Using where |
+---------+---------+-------+------+-------------+
2 rows in set (0.00 sec)
```
@ -1742,19 +1749,32 @@ yields
```
EXPLAIN for: SELECT `users`.* FROM `users` WHERE `users`.`id` = 1
+----+-------------+-------+-------+---------------+---------+---------+-------+------+-------+
| id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra |
+----+-------------+-------+-------+---------------+---------+---------+-------+------+-------+
| 1 | SIMPLE | users | const | PRIMARY | PRIMARY | 4 | const | 1 | |
+----+-------------+-------+-------+---------------+---------+---------+-------+------+-------+
+----+-------------+-------+-------+---------------+
| id | select_type | table | type | possible_keys |
+----+-------------+-------+-------+---------------+
| 1 | SIMPLE | users | const | PRIMARY |
+----+-------------+-------+-------+---------------+
+---------+---------+-------+------+-------+
| key | key_len | ref | rows | Extra |
+---------+---------+-------+------+-------+
| PRIMARY | 4 | const | 1 | |
+---------+---------+-------+------+-------+
1 row in set (0.00 sec)
EXPLAIN for: SELECT `articles`.* FROM `articles` WHERE `articles`.`user_id` IN (1)
+----+-------------+-------+------+---------------+------+---------+------+------+-------------+
| id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra |
+----+-------------+-------+------+---------------+------+---------+------+------+-------------+
| 1 | SIMPLE | articles | ALL | NULL | NULL | NULL | NULL | 1 | Using where |
+----+-------------+-------+------+---------------+------+---------+------+------+-------------+
+----+-------------+----------+------+---------------+
| id | select_type | table | type | possible_keys |
+----+-------------+----------+------+---------------+
| 1 | SIMPLE | articles | ALL | NULL |
+----+-------------+----------+------+---------------+
+------+---------+------+------+-------------+
| key | key_len | ref | rows | Extra |
+------+---------+------+------+-------------+
| NULL | NULL | NULL | 1 | Using where |
+------+---------+------+------+-------------+
1 row in set (0.00 sec)
```