MySQL如何比较两个表数据的差异

SELECT t1.column1, t1.column2, t2.column1, t2.column2
FROM table1 t1
INNER JOIN table2 t2 ON t1.id = t2.id
WHERE t1.column1 <> t2.column1 OR t1.column2 <> t2.column2;

SELECT t1.column1, t1.column2, t2.column1, t2.column2
FROM table1 t1
LEFT JOIN table2 t2 ON t1.id = t2.id
WHERE t2.id IS NULL OR t1.column1 <> t2.column1 OR t1.column2 <> t2.column2;

SELECT column1, column2
FROM table1
WHERE (column1, column2) NOT IN (SELECT column1, column2 FROM table2);

SELECT column1, column2
FROM table1
WHERE NOT EXISTS (SELECT 1 FROM table2 WHERE table2.column1 = table1.column1 AND table2.column2 = table1.column2);

-- 创建表table1和table2
CREATE TABLE table1 (
    id INT PRIMARY KEY,
    name VARCHAR(100)
);
CREATE TABLE table2 (
    id INT PRIMARY KEY,
    name VARCHAR(100)
);
-- 向table1和table2插入数据
INSERT INTO table1 VALUES (1, 'Alice'), (2, 'Bob'), (3, 'Charlie');
INSERT INTO table2 VALUES (1, 'Alice'), (3, 'Charlie'), (4, 'David');
-- 查询table1和table2的差集[注意如果是id一样，name不一样不会出现在结果中]
SELECT id FROM table1
EXCEPT
SELECT id FROM table2;
-- 查询table2和table1的差集[只要id和name中有一个不同则就会被认为数据不一致，出现在结果中]
SELECT id,name  FROM table2
EXCEPT
SELECT id,name  FROM table1;