create database mydb5;
use mydb5;

create  table student(
   sid int primary key,
   card_id varchar(20),
   name varchar(20),
   gender varchar(20),
   age int,
   birth date, 
   phone_num varchar(20),
   score double,
   index index_name(name) 
-- 给name列创建索引
);

--语法格式：create index indexname on tablename(columnname);
create index index_gender on student(gender);

--语法格式：alter table tablename add index indexname(columnname)
alter table student add index index_age(age);

--语法格式： select * from mysql.`innodb_index_stats` a where a.`database_name` = '数据库
名’; 
select * from mysql.`innodb_index_stats` a where a.`database_name` = 'mydb5';

/*语法格式： select * from mysql.`innodb_index_stats` a where a.`database_name` = '数据库名'and a.table_name like '%表名%’; */
select * from mysql.`innodb_index_stats` a where a.`database_name` = 'mydb5' and a.table_name like '%student%';

--语法格式：show index from table_name; 
show index from student;

drop index 索引名 on 表名 
-- 或 
alter table 表名 drop index 索引名

drop index index_gender on student 
-- 或 
alter table student drop index index_name

create  table student2(
   sid int primary key,
   card_id varchar(20),
   name varchar(20),
   gender varchar(20),
   age int,
   birth date, 
   phone_num varchar(20),
   score double,
    unique index_card_id(card_id) 
-- 给card_id列创建索引
);

--语法格式：create unique index 索引名 on 表名(列名) 
create unique index index_card_id on student2(card_id);

--语法格式：alter table 表名 add unique [索引名] (列名)
alter table student2 add unique index_phone_num(phone_num)

drop index index_card_id on student2 
-- 或 
alter table student2 drop index index_phone_num

create index indexname on table_name(column1(length),column2(length));

-- create index indexname on table_name(column1(length),column2(length)); 
create index index_phone_name on student(phone_num,name);

drop index index_phone_name on student;

create  unique index index_phone_name on student(phone_num,name);

select * from student where name = '张三'; 
select * from student where phone_num = '15100046637'; 
select * from student where phone_num = '15100046637' and name = '张三'; 
select * from student where name = '张三' and phone_num = '15100046637'; 
/* 
 三条sql只有 2 、 3、4能使用的到索引idx_phone_name,因为条件里面必须包含索引前面的字段 才能
够进行匹配。
而3和4相比where条件的顺序不一样，为什么4可以用到索引呢？是因为mysql本身就有一层sql优化，
他会根据sql来识别出来该用哪个索引，我们可以理解为3和4在mysql眼中是等价的。 
*/

show variables like '%ft%';

create table t_article (
     id int primary key auto_increment ,
     title varchar(255) ,
     content varchar(1000) ,
     writing_date date -- , 
     -- fulltext (content) -- 创建全文检索
);

insert into t_article values(null,"Yesterday Once More","When I was young I 
listen to the radio",'2021-10-01');
insert into t_article values(null,"Right Here Waiting","Oceans apart, day after 
day,and I slowly go insane",'2021-10-02'); 
insert into t_article values(null,"My Heart Will Go On","every night in my 
dreams,i see you, i feel you",'2021-10-03');
insert into t_article values(null,"Everything I Do","eLook into my eyes,You will 
see what you mean to me",'2021-10-04');
insert into t_article values(null,"Called To Say I Love You","say love you no new 
year's day, to celebrate",'2021-10-05');
insert into t_article values(null,"Nothing's Gonna Change My Love For You","if i 
had to live my life without you near me",'2021-10-06');
insert into t_article values(null,"Everybody","We're gonna bring the flavor show 
U how.",'2021-10-07');

alter table t_article add fulltext index_content(content)

create fulltext index index_content on t_article(content);

match (col1,col2,...) against(expr [search_modifier])
select * from t_article where match(content) against('yo’);
-- 没有结果 单词数需要大于等于3 
select * from t_article where match(content) against('you');
-- 有结果

create table shop_info (
 id  int  primary key auto_increment comment 'id',
 shop_name varchar(64) not null comment '门店名称',
 geom_point geometry not null comment '经纬度’,
 spatial key geom_index(geom_point)
);