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MySQL查询找到具有相同列值的字段总和？

2024-05-02 15:13:05 426

为此使用GROUPBY子句。让我们首先创建一个表-

mysql> create table sumOfFieldsDemo
   -> (
   -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,
   -> ClientSerialNumber varchar(100),
   -> ClientCost int
   -> );

以下是使用insert命令在表中插入一些记录的查询-

mysql> insert into sumOfFieldsDemo(ClientSerialNumber,ClientCost) values('1111',450);
mysql> insert into sumOfFieldsDemo(ClientSerialNumber,ClientCost) values('2222',550);
mysql> insert into sumOfFieldsDemo(ClientSerialNumber,ClientCost) values('3333',150);
mysql> insert into sumOfFieldsDemo(ClientSerialNumber,ClientCost) values('3333',250);
mysql> insert into sumOfFieldsDemo(ClientSerialNumber,ClientCost) values('2222',1000);
mysql> insert into sumOfFieldsDemo(ClientSerialNumber,ClientCost) values('1111',1000);
mysql> insert into sumOfFieldsDemo(ClientSerialNumber,ClientCost) values('1111',500);
mysql> insert into sumOfFieldsDemo(ClientSerialNumber,ClientCost) values('4444',100);

以下是使用select语句显示表中所有记录的查询-

mysql> select * from sumOfFieldsDemo;

这将产生以下输出-

+----+--------------------+------------+
| Id | ClientSerialNumber | ClientCost |
+----+--------------------+------------+
| 1  | 1111               | 450        |
| 2  | 2222               | 550        |
| 3  | 3333               | 150        |
| 4  | 3333               | 250        |
| 5  | 2222               | 1000       |
| 6  | 1111               | 1000       |
| 7  | 1111               | 500        |
| 8  | 4444               | 100        |
+----+--------------------+------------+
8 rows in set (0.00 sec)

这是查询以查找具有相同列值的字段总和-

mysql> select Id,ClientSerialNumber,SUM(ClientCost) AS TotalSum
   -> from sumOfFieldsDemo
   -> group by ClientSerialNumber;

这将产生以下输出-

+----+--------------------+----------+
| Id | ClientSerialNumber | TotalSum |
+----+--------------------+----------+
| 1  | 1111               | 1950     |
| 2  | 2222               | 1550     |
| 3  | 3333               | 400      |
| 8  | 4444               | 100      |
+----+--------------------+----------+
4 rows in set (0.00 sec)

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MySQL查询找到具有相同列值的字段总和？

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