How to improve this sql query performance？ - mysql

Question

SELECT id, name, detail FROM student WHERE id NOT IN (1,788,103,100) ORDER BY id DESC LIMIT 1000,10
The table is tiny (10,000 rows). I have to consider two point, "IN query" and "LIMIT query".
Here are the DDLs and the EXPLAIN. I'm using MySQL 5.6.4.
CREATE TABLE student
( id int(11) NOT NULL AUTO_INCREMENT
, name varchar(45) NOT NULL
, detail varchar(255) NOT NULL
, PRIMARY KEY (id)
) ENGINE = MyISAM;
| id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra |
| 1 | SIMPLE | student| ALL | Primary,id | NULL | NULL | NULL | 13 | |

Answer 1

The LIMIT and ORDER BY clauses mean that the query has to build the whole table and then order it and then go the record 1000 and then extract the next 10 records.
Why are you looking for 10 records starting at record 1000?
Removing the ORDER BY clause would make it faster as the query would only need to extract 1010 records.

Answer 2

I cannot replicate this finding...
SELECT VERSION();
+-----------+
| VERSION() |
+-----------+
| 5.5.16 |
+-----------+
SELECT COUNT(*) FROM student;
+----------+
| COUNT(*) |
+----------+
| 131072 |
+----------+
SELECT id
FROM student
WHERE id
NOT IN (1,788,103,100)
ORDER
BY id DESC
LIMIT 1000,10;
+--------+
| id |
+--------+
| 195591 |
| 195590 |
| 195589 |
| 195588 |
| 195587 |
| 195586 |
| 195585 |
| 195584 |
| 195583 |
| 195582 |
+--------+
10 rows in set (0.00 sec)
+----+-------------+---------+-------+---------------+---------+---------+------+--------+--------------------------+
| id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra |
+----+-------------+---------+-------+---------------+---------+---------+------+--------+--------------------------+
| 1 | SIMPLE | student | range | PRIMARY | PRIMARY | 4 | NULL | 131069 | Using where; Using index |
+----+-------------+---------+-------+---------------+---------+---------+------+--------+--------------------------+