获取MySQL中不同类型的用户数量?
让我们首先创建一个表-
mysql> create table DemoTable-> (
-> UserName varchar(20),
-> UserType ENUM('New User','Registered User')
-> );
使用插入命令在表中插入一些记录-
mysql> insert into DemoTable values('Chris','New User');mysql> insert into DemoTable values('David','New User');
mysql> insert into DemoTable values('Mike','Registered User');
mysql> insert into DemoTable values('Sam','New User');
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-
+----------+-----------------+| UserName | UserType |
+----------+-----------------+
| Chris | New User |
| David | New User |
| Mike | Registered User |
| Sam | New User |
+----------+-----------------+
4 rows in set (0.00 sec)
这是获取不同类型用户数量的查询-
mysql> select count(*),UserType from DemoTable group by UserType;
+----------+-----------------+| count(*) | UserType |
+----------+-----------------+
| 3 | New User |
| 1 | Registered User |
+----------+-----------------+
2 rows in set (0.00 sec)
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