MySQL多列IN查询的实现

-- 查询 (name, age, role) 匹配任意一组值的记录
SELECT * FROM users 
WHERE (name, age, role) IN (
    ('jinzhu', 18, 'admin'),
    ('jinzhu2', 19, 'user')
);

-- 查询与指定订单相关的用户
SELECT * FROM users 
WHERE (name, email) IN (
    SELECT customer_name, customer_email 
    FROM orders 
    WHERE status = 'paid'
);

SELECT * FROM users
WHERE (name = 'jinzhu' AND age = 18 AND role = 'admin')
   OR (name = 'jinzhu2' AND age = 19 AND role = 'user');

-- 使用临时表
CREATE TEMPORARY TABLE tmp_filters (name VARCHAR(255), age INT, role VARCHAR(255));
INSERT INTO tmp_filters VALUES ('jinzhu', 18, 'admin'), ('jinzhu2', 19, 'user');

SELECT u.* 
FROM users u
JOIN tmp_filters f ON u.name = f.name AND u.age = f.age AND u.role = f.role;

-- 每批最多 100 组条件（示例使用伪代码逻辑）
SELECT * FROM users
WHERE (name, age, role) IN (('jinzhu',18,'admin'), ... /* 100组 */);

-- 下一批次
SELECT * FROM users
WHERE (name, age, role) IN (('jinzhu101',20,'user'), ...);

SELECT * FROM users u
WHERE EXISTS (
  SELECT 1 
  FROM (VALUES ('jinzhu',18,'admin'), ('jinzhu2',19,'user')) AS t(name, age, role)
  WHERE u.name = t.name AND u.age = t.age AND u.role = t.role
);

filters = [('jinzhu', 18, 'admin'), ('jinzhu2', 19, 'user')]
placeholders = ', '.join(['(%s, %s, %s)'] * len(filters))
query = f"""
    SELECT * FROM users 
    WHERE (name, age, role) IN ({placeholders})
"""
# 展开参数：flattened = [x for tpl in filters for x in tpl]
cursor.execute(query, flattened)

-- 使用命名参数（需数据库驱动支持，如 PostgreSQL）
SELECT * FROM users 
WHERE (name, age, role) IN %(filters)s;

EXPLAIN SELECT * FROM users WHERE (name, age, role) IN (...);

SELECT u.*, o.order_id 
FROM users u
JOIN (
    VALUES ('jinzhu', 18, 'admin'), ('jinzhu2', 19, 'user')
) AS filter(name, age, role)
ON u.name = filter.name AND u.age = filter.age AND u.role = filter.role
LEFT JOIN orders o ON u.id = o.user_id;

SELECT 
    name,
    CASE 
        WHEN (name, age, role) IN (('jinzhu',18,'admin')) THEN 'VIP'
        ELSE 'Standard'
    END AS user_type
FROM users;