BTree索引使用技巧

Posted 2023-05-09

参考技术A explain select * from t_content where content_id = 17076710;
drop index idx_uid on t_content;
create index idx_uid on t_content(uid);
explain select * from t_content where uid=16940130;

drop index idx_uid on t_content;
create index idx_uid on t_content(uid);

explain select * from t_content where uid = 16940130;

explain select * from t_content where uid > 1260000 and uid < 12610000;

explain select * from t_content where uid like '1694%';

drop index idx_share_url on t_content;
create index idx_share_url on t_content(share_url);

explain select * from t_content where share_url like ' http://a.f.budejie.com/share/%' ;

explain select * from t_content where share_url like '% http://a.f.budejie.com/share/17076710' ;
explain select * from t_content where share_url like '% http://a.f.budejie.com/share/17076710%' ;

drop index idx_uid_sid on t_content;
create index idx_uid_sid on t_content( uid , source_id );

EXPLAIN select * from t_content where uid = 14206986 ;

EXPLAIN select * from t_content where uid=14206986 and source_id = 13054 ;

EXPLAIN select * from t_content where source_id <> 13054 ;
EXPLAIN select * from t_content where source_id <=13053 or source_id >=13055;

sql 使用BTREE创建索引

CREATE INDEX name_index ON reports_json_orders USING BTREE(((data ->> 'name')));

-- To create a B-tree index on the column title in the table films:
CREATE UNIQUE INDEX title_idx ON films (title);