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如何在MYSQL中选择多个也是重复值的最大值？

2024-05-18 03:34:05 584

为此，请使用联接概念。让我们首先创建一个-

create table DemoTable1389
   -> (
   -> StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY,
   -> StudentMarks int
   -> );

使用insert命令在表中插入一些记录。在这里，我们还插入了重复值-

insert into DemoTable1389(StudentMarks) values(40);
insert into DemoTable1389(StudentMarks) values(40);
insert into DemoTable1389(StudentMarks) values(68);
insert into DemoTable1389(StudentMarks) values(78);
insert into DemoTable1389(StudentMarks) values(97);
insert into DemoTable1389(StudentMarks) values(97);
insert into DemoTable1389(StudentMarks) values(97);

使用select语句显示表中的所有记录-

select * from  DemoTable1389;

这将产生以下输出-

+-----------+--------------+
| StudentId | StudentMarks |
+-----------+--------------+
|         1 |           40 |
|         2 |           40 |
|         3 |           68 |
|         4 |           78 |
|         5 |           97 |
|         6 |           97 |
|         7 |           97 |
+-----------+--------------+
7 rows in set (0.00 sec)

以下是选择多个最大值的查询-

select tbl.StudentId,tbl.StudentMarks from DemoTable1389 tbl
   -> join ( select max(StudentMarks) as MaxMarks from DemoTable1389) tbl1
   -> on tbl1.MaxMarks=tbl.StudentMarks;

这将产生以下显示最大值的输出，以及重复项-

+-----------+--------------+
| StudentId | StudentMarks |
+-----------+--------------+
|         5 |           97 |
|         6 |           97 |
|         7 |           97 |
+-----------+--------------+
3 rows in set (0.00 sec)

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如何在MYSQL中选择多个也是重复值的最大值？

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