用于按列分组并显示另一列中相似值的总和的 MySQL 查询

为此，请使用 GROUP BY HAVING 子句。

我们首先创建一个表 -

mysql> create table DemoTable782 (
   Name varchar(100),
   Score int
);
Query OK, 0 rows affected (1.18 sec)

使用 insert 命令向表中插入一些记录 -

mysql> insert into DemoTable782 values('John',156);
Query OK, 1 row affected (0.18 sec)
mysql> insert into DemoTable782 values('Carol',250);
Query OK, 1 row affected (0.15 sec)
mysql> insert into DemoTable782 values('Bob',140);
Query OK, 1 row affected (0.17 sec)
mysql> insert into DemoTable782 values('John',126);
Query OK, 1 row affected (0.29 sec)
mysql> insert into DemoTable782 values('John',140);
Query OK, 1 row affected (0.17 sec)
mysql> insert into DemoTable782 values('Bob',280);
Query OK, 1 row affected (0.17 sec)
mysql> insert into DemoTable782 values('Bob',250);
Query OK, 1 row affected (0.41 sec)
mysql> insert into DemoTable782 values('Carol',189);
Query OK, 1 row affected (0.17 sec)
mysql> insert into DemoTable782 values('Carol',299);
Query OK, 1 row affected (0.21 sec)

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总和的查询 -

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)

AmitDiwan

更新时间：2019 年 9 月 9 日

462 次浏览

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