MySql match against工具详细用法

CREATE TABLE articles (
    id INT PRIMARY KEY AUTO_INCREMENT,
    title VARCHAR(255) NOT NULL,
    content TEXT NOT NULL,
    FULLTEXT (title, content)  -- 在title和content列上创建全文索引
);

SELECT * FROM table_name 
WHERE MATCH(column1, column2, ...) AGAINST('search_term');

-- 插入数据
INSERT INTO articles (title, content) VALUES
('MySQL Tutorial', 'This is a tutorial about MySQL.'),
('Advanced MySQL', 'Learn advanced techniques in MySQL.'),
('PostgreSQL vs MySQL', 'A comparison between PostgreSQL and MySQL.');
​
-- 自然语言搜索
SELECT * FROM articles 
WHERE MATCH(title, content) AGAINST('MySQL');

SELECT id, title, MATCH(title, content) AGAINST('MySQL') AS score 
FROM articles 
WHERE MATCH(title, content) AGAINST('MySQL');

SELECT * FROM table_name 
WHERE MATCH(column1, column2, ...) AGAINST('search_term' IN BOOLEAN MODE);

-- 必须包含MySQL，且不包含PostgreSQL
SELECT * FROM articles 
WHERE MATCH(title, content) AGAINST('+MySQL -PostgreSQL' IN BOOLEAN MODE);
​
-- 包含MySQL或PostgreSQL
SELECT * FROM articles 
WHERE MATCH(title, content) AGAINST('MySQL PostgreSQL' IN BOOLEAN MODE);
​
-- 包含以My开头的词
SELECT * FROM articles 
WHERE MATCH(title, content) AGAINST('My*' IN BOOLEAN MODE);
​
-- 包含完整短语"MySQL Tutorial"
SELECT * FROM articles 
WHERE MATCH(title, content) AGAINST('"MySQL Tutorial"' IN BOOLEAN MODE);

SELECT id, title, MATCH(title, content) AGAINST('MySQL') AS score 
FROM articles 
WHERE MATCH(title, content) AGAINST('MySQL') 
ORDER BY score DESC;

-- 查看当前配置
SHOW VARIABLES LIKE 'innodb_ft_min_token_size';
​
-- 修改配置（需要重启MySQL）
SET GLOBAL innodb_ft_min_token_size = 2;

-- 创建表时指定ngram分词器
CREATE TABLE articles (
    id INT PRIMARY KEY AUTO_INCREMENT,
    title VARCHAR(255) NOT NULL,
    content TEXT NOT NULL,
    FULLTEXT (title, content) WITH PARSER ngram
);
​
-- 查询时使用ngram分词器
SELECT * FROM articles 
WHERE MATCH(title, content) AGAINST('关键词' IN BOOLEAN MODE);

ALTER TABLE table_name DROP INDEX index_name;

ALTER TABLE articles DROP INDEX title;