作者：mobiledu2502876193 | 来源：互联网 | 2021-11-04 23:29
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：
代码如下:
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
代码如下:
(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
代码如下:
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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