mysql 查询一个值不等于

SELECT * FROM users WHERE age != 25;

SELECT * FROM users WHERE age <> 25;

SELECT * FROM users WHERE age != 25 OR age IS NULL;

CREATE INDEX idx_age ON users(age);

SELECT * FROM users WHERE age NOT IN (25);

CREATE TABLE users (
    id INT PRIMARY KEY,
    name VARCHAR(100),
    age INT
);

INSERT INTO users (id, name, age) VALUES (1, 'Alice', 24);
INSERT INTO users (id, name, age) VALUES (2, 'Bob', 25);
INSERT INTO users (id, name, age) VALUES (3, 'Charlie', 26);
INSERT INTO users (id, name, age) VALUES (4, 'David', NULL);

SELECT * FROM users WHERE age != 25;