获取一个字符串在MySQL列中出现多少次的计数？

让我们首先创建一个表-

create table DemoTable704 (SubjectName text);

使用插入命令在表中插入一些记录-

insert into DemoTable704 values(Introduction to MySQL); insert into DemoTable704 values(Introduction to MongoDB); insert into DemoTable704 values(Introduction to MySQL); insert into DemoTable704 values(Introduction to Java); insert into DemoTable704 values(Introduction to MongoDB); insert into DemoTable704 values(Introduction to MySQL); insert into DemoTable704 values(Introduction to C); insert into DemoTable704 values(Introduction to Spring and Hibernate);

使用select语句显示表中的所有记录-

select *from DemoTable704;

这将产生以下输出-

+--------------------------------------+ | SubjectName | +--------------------------------------+ | Introduction to MySQL | | Introduction to MongoDB | | Introduction to MySQL | | Introduction to Java | | Introduction to MongoDB | | Introduction to MySQL | | Introduction to C | | Introduction to Spring and Hibernate | +--------------------------------------+ 8 rows in set (0.00 sec)

以下是查询以获取字符串在列中出现的次数的计数-

SELECT COUNT(*) from DemoTable704 WHERE SubjectName LIKE %Introduction to MySQL%;

这将产生以下输出-

+----------+ | COUNT(*) | +----------+ | 3 | +----------+ 1 row in set (0.00 sec)