索引類型：NORMAL? ?索引方法：BTREE

一般這樣子設置就OK了

一.sql查詢語句

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 按照上面一個一個加

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=索引名稱

plate_id=要加索引的字段

2.2 聯合索引? 查詢多個字段時，這樣子寫會自動判斷用那個索引

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

總結

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