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MySQL查询汇总行的值并对结果进行排序？

2024-05-18 06:06:06 347

为此，您可以将GROUPBY与ORDERBY子句一起使用。让我们首先创建一个表-

create table DemoTable1499
   -> (
   -> StudentName varchar(20),
   -> StudentMarks int
   -> );

使用插入命令在表中插入一些记录-

insert into DemoTable1499 values('Chris',56);
insert into DemoTable1499 values('David',78);
insert into DemoTable1499 values('Bob',98);
insert into DemoTable1499 values('Chris',45);
insert into DemoTable1499 values('David',98);
insert into DemoTable1499 values('Bob',58);

使用select语句显示表中的所有记录-

Mysql> select * from DemoTable1499;

这将产生以下输出-

+-------------+--------------+
| StudentName | StudentMarks |
+-------------+--------------+
| Chris       |           56 |
| David       |           78 |
| Bob         |           98 |
| Chris       |           45 |
| David       |           98 |
| Bob         |           58 |
+-------------+--------------+
6 rows in set (0.00 sec)

以下是汇总行值并对结果进行排序的查询-

select StudentName,sum(StudentMarks) as TotalSum from DemoTable1499
   -> group by StudentName
   -> order by TotalSum desc;

这将产生以下输出-

+-------------+----------+
| StudentName | TotalSum |
+-------------+----------+
| David       |      176 |
| Bob         |      156 |
| Chris       |      101 |
+-------------+----------+
3 rows in set (0.00 sec)

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MySQL查询汇总行的值并对结果进行排序？

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