我们如何模拟返回多个表达式的 MySQL INTERSECT 查询？

由于我们无法在MySQL中使用INTERSECT查询，因此我们将使用EXIST运算符来模拟INTERSECT查询。可以通过以下示例来理解 -

示例

在此示例中，我们有两个表，即 Student_detail 和 Student_info，具有以下数据 -

mysql> Select * from Student_detail;
+-----------+---------+------------+------------+
| studentid | Name    | Address    | Subject    |
+-----------+---------+------------+------------+
|       101 | YashPal | Amritsar   | History    |
|       105 | Gaurav  | Chandigarh | Literature |
|       130 | Ram     | Jhansi     | Computers  |
|       132 | Shyam   | Chandigarh | Economics  |
|       133 | Mohan   | Delhi      | Computers  |
|       150 | Rajesh  | Jaipur     | Yoga       |
|       160 | Pradeep | Kochi      | Hindi      |
+-----------+---------+------------+------------+
7 rows in set (0.00 sec)

mysql> Select * from Student_info;
+-----------+-----------+------------+-------------+
| studentid | Name      | Address    | Subject     |
+-----------+-----------+------------+-------------+
|       101 | YashPal   | Amritsar   | History     |
|       105 | Gaurav    | Chandigarh | Literature  |
|       130 | Ram       | Jhansi     | Computers   |
|       132 | Shyam     | Chandigarh | Economics   |
|       133 | Mohan     | Delhi      | Computers   |
|       165 | Abhimanyu | Calcutta   | Electronics |
+-----------+-----------+------------+-------------+
6 rows in set (0.00 sec)

现在，使用带有 WHERE 子句的 EXIST 运算符的以下查询将模拟 INTERSECT 以返回两个表中都存在的“studentid”、姓名、地址（其中名称不是“Yashpal”） -

mysql>Select Student_detail.studentid,Student_detail.name, student_detail.address FROM student_detail WHERE Student_detail.studentid >100 AND EXISTS (SELECT * FROM Student_info WHERE Student_info.Name <> &#39;Yashpal&#39; AND Student_info.studentid = Student_detail.studentid AND Student_info.name = Student_detail.name);
+-----------+--------+------------+
| studentid | name   | address    |
+-----------+--------+------------+
|       105 | Gaurav | Chandigarh |
|       130 | Ram    | Jhansi     |
|       132 | Shyam  | Chandigarh |
|       133 | Mohan  | Delhi      |
+-----------+--------+------------+
4 rows in set (0.00 sec)

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