获取MySQL中重复记录的列总和
为此，将GROUPBY子句与聚合函数一起使用SUM()。让我们首先创建一个表-
mysql> create table DemoTable( Name varchar(100), Score int );
使用插入命令在表中插入一些记录-
mysql> insert into DemoTable values('Adam',50);
mysql> insert into DemoTable values('Bob',80);
mysql> insert into DemoTable values('Adam',70);
mysql> insert into DemoTable values('Adam',10);
mysql> insert into DemoTable values('Carol',98);
mysql> insert into DemoTable values('Bob',10);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-
+-------+-------+ | Name | Score | +-------+-------+ | Adam | 50 | | Bob | 80 | | Adam | 70 | | Adam | 10 | | Carol | 98 | | Bob | 10 | +-------+-------+ 6 rows in set (0.00 sec)
以下是查询以获取MySQL中重复记录的列总和-
mysql> select Name,sum(Score) from DemoTable group by Name;
这将产生以下输出-
+-------+------------+ | Name | sum(Score) | +-------+------------+ | Adam | 130 | | Bob | 90 | | Carol | 98 | +-------+------------+ 3 rows in set (0.00 sec)