返回 MySQL 中计数最高的字段
mysqlmysqli database
要返回计数最高的字段，请使用 ORDER BY COUNT(*)。让我们首先创建一个表 −
mysql> create table DemoTable1940 ( FirstName varchar(20) ); Query OK, 0 rows affected (0.00 sec)
使用 insert 命令在表中插入一些记录 −
mysql> insert into DemoTable1940 values('Chris');
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1940 values('Mike');
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1940 values('Adam');
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1940 values('Mike');
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1940 values('Chris');
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1940 values('David');
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1940 values('Mike');
Query OK, 1 row affected (0.00 sec)
使用 select 语句显示表中的所有记录 −
mysql> select * from DemoTable1940;
这将产生以下输出 −
+-----------+ | FirstName | +-----------+ | Chris | | Mike | | Adam | | Mike | | Chris | | David | | Mike | +-----------+ 7 rows in set (0.00 sec)
以下查询返回计数最高的字段:
mysql> select * from DemoTable1940 group by FirstName order by count(*) desc limit 1;
这将产生以下输出 −
+-----------+ | FirstName | +-----------+ | Mike | +-----------+ 1 row in set (0.00 sec)
