如何使用 MySQL 获取特定单词在列中出现的次数?
mysqlmysqli database更新于 2025/5/27 17:48:17
为此，您可以使用 COUNT() 函数。让我们首先创建一个表 −
mysql> create table DemoTable -> ( -> EmployeeId int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> EmployeeName varchar(100) -> ); Query OK, 0 rows affected (0.62 sec)
使用 insert 命令在表中插入一些记录 −
mysql> insert into DemoTable(EmployeeName) values('John');
Query OK, 1 row affected (0.21 sec)
mysql> insert into DemoTable(EmployeeName) values('Carol');
Query OK, 1 row affected (0.17 sec)
mysql> insert into DemoTable(EmployeeName) values('David');
Query OK, 1 row affected (0.14 sec)
mysql> insert into DemoTable(EmployeeName) values('Carol');
Query OK, 1 row affected (0.14 sec)
mysql> insert into DemoTable(EmployeeName) values('Carol');
Query OK, 1 row affected (0.29 sec)
mysql> insert into DemoTable(EmployeeName) values('Bob');
Query OK, 1 row affected (0.22 sec)
mysql> insert into DemoTable(EmployeeName) values('Sam');
Query OK, 1 row affected (0.12 sec)
使用 select 语句显示表中的所有记录 −
mysql> select *from DemoTable;
输出
这将产生以下输出 −
+------------+--------------+ | EmployeeId | EmployeeName | +------------+--------------+ | 1 | John | | 2 | Carol | | 3 | David | | 4 | Carol | | 5 | Carol | | 6 | Bob | | 7 | Sam | +------------+--------------+ 7 rows in set (0.00 sec)
以下是获取特定单词在 MySQL 中出现次数的查询。在这里，我们查找员工"Carol"的出现次数 −
mysql> select EmployeeName,count(EmployeeId) as Occurrence from DemoTable where EmployeeName='Carol';
输出
这将产生以下输出 −
+--------------+------------+ | EmployeeName | Occurrence | +--------------+------------+ | Carol | 3 | +--------------+------------+ 1 row in set (0.05 sec)
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