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如何通过SQL找出2个表里值不同的列的方法_MySQL

程序员文章站 2022-06-15 17:06:31
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以下有两个表,他们的结构完全相同,请通过SQL找出值不同的列。

Student_1

NAME AGE SCORE
peter 26 100
jack 25 96
daniel 26 48
bark 21 69

Student_2

NAME AGE SCORE
peter 26 89
jack 25 96
daniel 26 48
bark 21 69

方法一 -- NOT EXISTS:


SELECT *
FROM Student_1 S1
WHERE NOT EXISTS
(SELECT *
FROM Student_2 S2
WHERE S1.name = S2.name
AND S1.age = S2.age
AND S1.score = S2.score
)
UNION ALL
SELECT *
FROM STUDENT_2 S2
WHERE NOT EXISTS
(SELECT *
FROM STUDENT_1 S1
WHERE S1.name = S2.name
AND S1.age = S2.age
AND S1.score = S2.score
);

方法二 -- MINUS

(SELECT * FROM Student_1
MINUS
SELECT * FROM Student_2)
UNION ALL
(SELECT * FROM Student_2
MINUS
SELECT * FROM Student_1)

方法三 -- HAVING GROUP BY

SELECT DISTINCT name, age, score FROM (
SELECT * FROM Student_1
UNION ALL
SELECT * FROM Student_2
)GROUP BY name, age, score HAVING COUNT(*)=1 ;

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