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返回MySQL中列的前n个字母

2024-04-23 22:54:03 357

要返回前n个字母，请使用LEFT()函数。以下是语法-

select left(yourColumnName,yourValue) from yourTableName;

让我们首先创建一个表-

mysql> create table DemoTable
   -> (
   -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,
   -> CourseTitle text
   -> );

使用插入命令在表中插入一些记录-

mysql> insert into DemoTable(CourseTitle) values('Java with Spring and Hibernate framework');

mysql> insert into DemoTable(CourseTitle) values('Python Web Development');

使用select语句显示表中的所有记录-

mysql> select *from DemoTable;

输出结果

+----+------------------------------------------+
| Id | CourseTitle                              |
+----+------------------------------------------+
| 1  | Java with Spring and Hibernate framework |
| 2  | Python Web Development                   |
+----+------------------------------------------+
2 rows in set (0.00 sec)

这是查询以返回列的前n个字母-

mysql> select LEFT(CourseTitle,20) from DemoTable;

输出结果

+----------------------+
| left(CourseTitle,20) |
+----------------------+
| Java with Spring and |
| Python Web Developme |
+----------------------+
2 rows in set (0.00 sec)

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返回MySQL中列的前n个字母

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