MySQL 查询对同一客户的类似列中的产品价格值求和，并在同一列中显示结果
mysqlmysqli database更新于 2025/12/24 4:28:17
为此，请使用 SUM() 和 GROUP BY。让我们首先创建一个表 −
mysql> create table DemoTable ( CustomerName varchar(100), Product_1_Price int, Product_2_Price int ); Query OK, 0 rows affected (0.73 sec)
使用 insert 命令在表中插入一些记录 −
mysql> insert into DemoTable values('John',67,89);
Query OK, 1 row affected (0.17 sec)
mysql> insert into DemoTable values('David',769,890);
Query OK, 1 row affected (0.14 sec)
mysql> insert into DemoTable values('David',987,1000);
Query OK, 1 row affected (0.15 sec)
mysql> insert into DemoTable values('John',900,111);
Query OK, 1 row affected (0.12 sec)
使用 select 语句显示表中的所有记录 −
mysql> select *from DemoTable;
这将产生以下输出 −
+--------------+-----------------+-----------------+ | CustomerName | Product_1_Price | Product_2_Price | +--------------+-----------------+-----------------+ | John | 67 | 89 | | David | 769 | 890 | | David | 987 | 1000 | | John | 900 | 111 | +--------------+-----------------+-----------------+ 4 rows in set (0.00 sec)
以下是针对同一客户对值求和并显示结果的查询 −
mysql> select CustomerName,SUM(Product_1_Price) AS Total1,SUM(Product_2_Price) As Total2 from DemoTable group by CustomerName;
这将产生以下输出 −
+--------------+--------+--------+ | CustomerName | Total1 | Total2 | +--------------+--------+--------+ | John | 967 | 200 | | David | 1756 | 1890 | +--------------+--------+--------+ 2 rows in set (0.00 sec)
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