MySQL 如何使用MySQL返回具有相同列值的行？

使用GROUP BY子句。我们首先创建一个表-

mysql> create table DemoTable
   -> (
   -> StudentId int,
   -> StudentMarks int
   -> );
Query OK, 0 rows affected (4.71 sec)

使用插入命令将一些记录插入表中-

mysql> insert into DemoTable values(23,58);
Query OK, 1 row affected (0.70 sec)

mysql> insert into DemoTable values(25,89);
Query OK, 1 row affected (0.46 sec)

mysql> insert into DemoTable values(26,58);
Query OK, 1 row affected (1.13 sec)

mysql> insert into DemoTable values(28,98);
Query OK, 1 row affected (0.86 sec)

使用select语句从表中显示所有记录 –

mysql＞select *from DemoTable;

阅读更多：MySQL 教程

输出

+-----------+--------------+
| StudentId | StudentMarks |
+-----------+--------------+
| 23        | 58           |
| 25        | 89           |
| 26        | 58           |
| 28        | 98           |
+-----------+--------------+
4 rows in set (0.00 sec)

以下是在MySQL中返回具有相同列值的行的查询-

mysql> select StudentMarks from DemoTable
   -> group by StudentMarks
   -> having sum(StudentId=23) > 0 and
   -> sum(StudentId=26) > 0;

输出

+--------------+
| StudentMarks |
+--------------+
| 58           |
+--------------+
1 row in set (0.00 sec)