要在MySQL中获取字符串的前n个字符,请使用LEFT()
。为了获得字符串的最后n个字符,该RIGHT()
方法在MySQL中使用。
RIGHT()
method的语法如下-
SELECT RIGHT(yourColumnName, valueOfN) as anyVariableName from yourTableName;
为了理解上述概念,让我们创建一个表。创建表的查询如下-
mysql> create table gettingLast5Characters −> ( −> BookName varchar(100) −> );
现在,您可以使用insert命令在表中插入记录。查询如下-
mysql> insert into gettingLast5Characters values('Introduction to C'); mysql> insert into gettingLast5Characters values('C in Depth'); mysql> insert into gettingLast5Characters values('Introduction to Java'); mysql> insert into gettingLast5Characters values('Let us C');
使用select语句显示表中的所有记录。显示所有记录的查询如下-
mysql> select *from gettingLast5Characters;
以下是输出-
+----------------------+ | BookName | +----------------------+ | Introduction to C | | C in Depth | | Introduction to Java | | Let us C | +----------------------+ 4 rows in set (0.00 sec)
这是获取字符串的最后5个字符的查询-
mysql> select RIGHT(BookName,5) as Last5Character from gettingLast5Characters;
以下是输出-
+----------------+ | Last5Character | +----------------+ | to C | | Depth | | Java | | us C | +----------------+ 4 rows in set (0.04 sec)
查看上面的示例输出,空间也在计数。