MySQL查询按列分组并在另一列中显示相似值的总和
为此，请使用GROUPBYHAVING子句。
让我们首先创建一个表-
mysql> create table DemoTable782 ( Name varchar(100), Score int );
使用插入命令在表中插入一些记录-
mysql> insert into DemoTable782 values('John',156);
mysql> insert into DemoTable782 values('Carol',250);
mysql> insert into DemoTable782 values('Bob',140);
mysql> insert into DemoTable782 values('John',126);
mysql> insert into DemoTable782 values('John',140);
mysql> insert into DemoTable782 values('Bob',280);
mysql> insert into DemoTable782 values('Bob',250);
mysql> insert into DemoTable782 values('Carol',189);
mysql> insert into DemoTable782 values('Carol',299);使用select语句显示表中的所有记录-
mysql> select *from DemoTable782;
这将产生以下输出-
+-------+-------+ | Name | Score | +-------+-------+ | John | 156 | | Carol | 250 | | Bob | 140 | | John | 126 | | John | 140 | | Bob | 280 | | Bob | 250 | | Carol | 189 | | Carol | 299 | +-------+-------+ 9 rows in set (0.00 sec)
以下是按列分组并显示相似值之和的查询-
mysql> select Name,SUM(Score) AS Total from DemoTable782 group by Name HAVING Total > 500;
这将产生以下输出-
+-------+-------+ | Name | Total | +-------+-------+ | Carol | 738 | | Bob | 670 | +-------+-------+ 2 rows in set (0.00 sec)