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Substring()for MySQL中的字段？

2024-05-10 03:24:06 357

您可以使用substring()MySQL中的字段来获取字符串的一部分。以下是语法-

select substring(yourColumnName,yourStartingIndex,yourEndingIndex) from yourTableName;

让我们首先创建一个表-

mysql> create table DemoTable
   (
   Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,
   Title longtext
   );

使用插入命令在表中插入一些记录-

mysql> insert into DemoTable(Title) values('MySQL is a relational database management system');

mysql> insert into DemoTable(Title) values('MongoDB is a popular No SQL database');

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-

+----+--------------------------------------------------+
| Id | Title                                            |
+----+--------------------------------------------------+
| 1 | MySQL is a relational database management system  |
| 2 | MongoDB is a popular No SQL database              |
+----+--------------------------------------------------+
2 rows in set (0.00 sec)

以下是substring()用于字段的查询。

mysql> select substring(Title,1,21) from DemoTable;

这将产生以下输出-

+-----------------------+
| substring(Title,1,21) |
+-----------------------+
| MySQL is a relational |
| MongoDB is a popular  |
+-----------------------+
2 rows in set (0.00 sec)

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Substring()for MySQL中的字段？

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