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                合規國際互聯網加速 OSASE為企業客戶提供高速穩定SD-WAN國際加速解決方案。 廣告
                #### 算法 **根據"字段內容"是否在 某個范圍進行分區,通過預定義的范圍的值來對數據進行分割.** 這種模式允許將數據劃分不同范圍。例如可以將一個表通過月份劃分成若干個分區 . #### 語法 ~~~ create table p_range( id int, name varchar(32), birthday date )engine innodb charset utf8 partition by range (month(birthday))( //用month() 獲得月份值 partition p_1 values less than (3), partition p_2 values less than(6), partition p_3 values less than(9), partition p_4 values less than MAXVALUE ); ~~~ less than : 小于等于 ; MAX VALUE : 可能的最大值 ; **文件結構** ![](https://box.kancloud.cn/0f06f4ae62e3f4830aea69b1bd90fe93_861x263.png) #### 測試 ~~~ explain partitions select * from user where age > 20\G ~~~ 結果: ~~~ id: 1 select_type: SIMPLE table: user partitions: p_3,p_4 //使用了分區, type: range possible_keys: age key: age //給字段加索引效果更好 key_len: 2 ref: NULL rows: 3 filtered: 100.00 Extra: Using index condition ~~~
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