mysql 索引 (Navicat添加索引)

索引类型：NORMAL   索引方法：BTREE

一般这样子设置就OK了

一.sql查询语句

SELECT
  bp.id AS post_id,
  `bp`.`title`,
  bp.img AS bbs_img,
  `bp`.`content`,
  `bp`.`follow`,
  `bp`.`reply`,
  `bp`.`top`,
  `bp`.`time`,
  `bp`.`click`,
  `u`.`nickname`,
  `u`.`img`,
  u.id AS uid,
  bpf.id AS follow_id,
  `bu`.`is_moderator`,
  `bp`.`up`,
  `bp`.`down`,
  `pu`.`type` 
FROM
  `edu_bbs_post` `bp`
  INNER JOIN `edu_user` `u` ON `u`.`id` = bp.add_user_id 
  AND u.deleted = 0 
  AND u.state = 0
  LEFT JOIN `edu_bbs_post_follow` `bpf` ON `bpf`.`post_id` = bp.id 
  AND bpf.user_id = '103'
  LEFT JOIN `edu_bbs_user` `bu` ON `bu`.`plate_id` = bp.plate_id 
  AND bu.user_id = '103' 
  AND bu.is_moderator = 1 
  AND bu.deleted = 0
  LEFT JOIN `edu_bbs_post_updown` `pu` ON `pu`.`post_id` = bp.id 
  AND pu.user_id = '103' 
WHERE
  ( bp.deleted = 0 AND bp.audit = 1 AND bp.plate_id = '4' ) 
ORDER BY
  `bp`.`top` DESC,
  `bp`.`id` DESC 
  LIMIT 0,
  12;

1.2查看是否有索引  命令:DESC  

二.添加索引 按照上面一个一个加

alter table  `edu_bbs_post` add key plate(`plate_id`);

alter table  `edu_bbs_post_follow` add key post_id(`post_id`);
alter table  `edu_bbs_post_follow` add key user_id(`user_id`);
alter table  `edu_bbs_post_follow` add key post_user(`post_id`,`user_id`);

alter table  `edu_bbs_user` add key user_plate(`user_id`,`plate_id`);

alter table  `edu_bbs_post_updown` add key post_user(`post_id`,`user_id`);

2.1 注意

plate(`plate_id`);

plate=索引名称

plate_id=要加索引的字段

2.2 联合索引  查询多个字段时，这样子写会自动判断用那个索引

alter table  `edu_bbs_post_updown` add key post_user(`post_id`,`user_id`);